Class / Patent application number | Description | Number of patent applications / Date published |
560347000 | Carbonyl dihalide reactant (e.g., phosgene, etc.) | 74 |
20080200721 | Mdi Production By Means of Liquid Phase and Gas Phase Phosgenation - The invention relates to a process for preparing isocyanates, which comprises the
| 08-21-2008 |
20080200722 | Method For Producing Diisocyanates - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 08-21-2008 |
20080275269 | Process for the preparation of 4,4'-diphenylmethane diisocyanate - 4,4′-diphenylmethane diisocyanate is produced at two different sites by
| 11-06-2008 |
20090054684 | PROCESSES FOR PREPARING LOW-CHLORINE ISOCYANATES - Processes comprising providing an amine reactant, and reacting the amine reactant with a stream of phosgene in a reaction zone to form a product comprising a corresponding isocyanate, wherein the phosgene stream has a CO content of 0.5% by weight or more. | 02-26-2009 |
20090112017 | METHOD FOR PRODUCING POLYISOCYANATES - The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene in the presence of a solvent, wherein ionic liquids are used as solvents. | 04-30-2009 |
20090112018 | METHOD FOR PRODUCING POLYISOCYANATES - The invention provides a process for preparing isocyanates by reacting the corresponding amines with phosgene in the presence of solvents, wherein compounds which form salt melts with hydrogen chloride are used as solvents. | 04-30-2009 |
20090149671 | Preparation of light-colored isocyanates - The invention relates to the preparation of isocyanates by phosgenation of amines in the gas phase, with these isocyanates having a comparatively low proportion of color-imparting compounds. | 06-11-2009 |
20090149672 | Process for the production of aromatic discocyanates in the gas - Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups. | 06-11-2009 |
20090209784 | Process for the preparation of isocyanates - The present invention relates to a process for the preparation of isocyanates by reacting the appropriate amines with phosgene, condensing the gas mixture thereby obtained, stripping the liquid phase thereby obtained and returning the solvent so retained in liquid form to the reaction stage. The gaseous constituents are then purified further in an absorption process. | 08-20-2009 |
20090221846 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use. | 09-03-2009 |
20090240076 | PROCESS FOR PREPARING METHYLENEDIPHENYL DIISOCYANATES - The invention relates to a process for preparing methylenediphenyl diisocyanates which comprises at least the steps: A) reaction of aniline with formaldehyde in the presence of hydrochloric acid as catalyst to give a mixture of diamines and polyamines of the diphenylmethane series (MDA) and subsequent at least partial neutralization of the hydrochloric acid by means of alkali metal hydroxide, B) reaction of the mixture of diamines and polyamines of the diphenylmethane series obtained in step A) with phosgene to give a mixture of diisocyanates and polyisocyanates of the diphenylmethane series (MDI) and hydrogen chloride, wherein C) the hydrochloric acid which has been neutralized in step A) is separated off in the form of a solution containing alkali metal chloride and is subsequently at least partly fed to an electrochemical oxidation to form chlorine, alkali metal hydroxide and optionally hydrogen and D) at least part of the chlorine produced in step C) is used for preparing the phosgene used in step B). | 09-24-2009 |
20090240077 | PROCESS FOR PRODUCING DIAMINES AND POLYAMINES OF THE DIPHENYLMETHANE SERIES - The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline. | 09-24-2009 |
20090281350 | METHOD FOR PRODUCING ISOCYANATES - The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene. | 11-12-2009 |
20100010257 | SEPARATION OF AMMONIUM CHLORIDE FROM THE GAS PHASE OF AN ISOCYANATE PRODUCTION PROCESS - Isocyanates are produced in the gas phase and by-products such as ammonium halides are selectively separated from the gas phase by desublimation. | 01-14-2010 |
20100041914 | METHOD FOR THE PRODUCTION OF ISOCYANATES - The present invention relates to a process for preparing isocyanates. | 02-18-2010 |
20100041915 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 02-18-2010 |
20100048942 | PROCESS FOR PREPARING ISOCYANATES - The present invention relates to a process for preparing isocyanates in particular apparatuses. | 02-25-2010 |
20100056822 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a process for preparing isocyanates in the gas phase. | 03-04-2010 |
20100076218 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a process for preparing isocyanates in the gas phase. | 03-25-2010 |
20100130772 | SPIRAL MIXER NOZZLE AND METHOD FOR MIXING TWO OR MORE FLUIDS AND PROCESS FOR MANUFACTURING ISOCYANATES - An apparatus for mixing at least first and second fluid, comprising: (a) a first nozzle comprising a first flow duct defining a first flow chamber, and having a first nozzle tip having a first discharge opening; and (b) a second nozzle comprising a second flow duct defining a second flow chamber, and having a second nozzle tip having a second discharge opening; wherein said first flow duct and said second flow duct are spirally wrapped each over the other. The invention also provides a process for mixing fluids, especially adapted for the production of isocyanates, and that is notably carried out in the apparatus of the invention. | 05-27-2010 |
20100137634 | Hole jet reactor and a process for the preparation of an isocyanate using the reactor - The present invention relates to a hole-jetting type reactor and its applications, in particular to a process for the production of isocyanates by the phosgenation of aliphatic or aromatic diamines or triamines in the gas phase using this reactor. The present invention achieves a good mixing and reacting result of the gas-phase phosgenation reaction at a high temperature by improving the mixing of reactants in the reactor to reduce the possibility of forming swirls and eliminate negative pressure produced at a local jet area, which can finally reduce back-mixing and formation of solid by-products. | 06-03-2010 |
20100152484 | PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE - Aromatic isocyanates are produced by reacting one or more aromatic primary amines with phosgene in the gas phase. The phosgene and primary aromatic amine(s) are reacted at a temperature above the boiling temperature of the amine(s) in a reactor having a reaction space which is essentially rotationally symmetric to the direction of flow. The flow fate, averaged over the cross-section, of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is between 4 and 80 % is not more than 8 m/sec. The flow rate averaged over the cross-section of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is 4 to 80 % is always below the flow rate averaged over the cross-section at the start of this section. | 06-17-2010 |
20100160673 | PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE - Primary isocyanates are produced by reacting the corresponding primary amine(s) with phosgene at a temperature above the boiling temperature of the amine(s) in a tube reactor with a reaction space. In this tube reactor, at least one educt stream P containing phosgene and at least one educt stream A containing the amine(s) are fed to the reaction space via a nozzle arrangement. The nozzle arrangement includes a number of n≧1 nozzles aligned parallel to the axis of rotation of the tube reactor and a free space surrounding the nozzles. One of the educt streams A or P is fed to the reaction space via the nozzles and the other educt stream is fed to the reaction space via the free space surrounding the nozzles. The reaction space contains at least one moving mixing device. | 06-24-2010 |
20100160674 | PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE - Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor. | 06-24-2010 |
20100204510 | PROCESS FOR PRODUCTION OF DI- AND POLYAMINES OF THE DIPHENYLMETHANE SERIES - Process for the production of di- and poly(diamino diphenyl methane) comprising the steps of | 08-12-2010 |
20100210870 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates. | 08-19-2010 |
20100298596 | PROCESS FOR THE PRODUCTION OF ISOCYANATES - Isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), are produced by reaction of amines dissolved in a solvent with phosgene in the same solvent to form the corresponding isocyanates. Hydrogen chloride and excess phosgene are subsequently removed from the reaction mixture to obtain a crude isocyanate-containing solution. Subsequently, the crude isocyanate-containing solution is separated by distillation into isocyanates and solvent. The solvent is recycled and used for the production of solutions of the amines and of phosgene. The solvent being recycled is treated to reduce the phosgene and diisocyanate contents before being used for the production of the solution of the amine. | 11-25-2010 |
20100305356 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates. | 12-02-2010 |
20100312009 | GAS-PHASE PHOSGENATION PROCESS - The present invention relates to a process for the phosgenation of amines in the gas phase, in which a specific type of heat exchanger is used for vaporizing the amines. | 12-09-2010 |
20100317889 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel. | 12-16-2010 |
20110021811 | PROCESS FOR THE PREPARATION OF TOLUENE-DIISOCYANATE - The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene. | 01-27-2011 |
20110105785 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of at least one inert medium, the phosgene being passed into a reactor ( | 05-05-2011 |
20110124907 | JET REACTOR WITH FLOW DUCTS AND PROCESS FOR PREPARING ISOCYANATES USING IT - The present invention provides a flow duct type jet reactor and a process for preparing isocyanates using it. The flow duct type jet reactor situates flow ducts in inner feed pipe which form whirlpool and reinforce vortex, thereby amine steam rapidly admixes and reacts with phosgene, and the byproducts are reduced. In addition, the present process uses a jet-absorption apparatus which rapidly cools the high temperature gas discharged from the reactor to a temperature at which the product is thermally stable, and at the same time provides negative pressure for the reaction process of the system, and thus saving bulky vacuum system. | 05-26-2011 |
20110124908 | PROCESS FOR PREPARING ISOCYANATES - The invention provides a process for preparing polyisocyanates, comprising the steps of
| 05-26-2011 |
20110144381 | METHOD FOR PURIFYING A CHLORINE SUPPLY - This invention provides a method for purifying a chlorine supply that includes a chlorine component, a bromine component, and nitrogen trichloride. The method includes the steps of introducing the chlorine supply into a vaporizer, heating the chlorine supply in the vaporizer to form a vapor, and introducing the vapor into a distillation system to provide purified chlorine gas, a distillate that includes liquid chlorine and the bromine component, and a bottoms component including the nitrogen trichloride. The method also includes the steps of condensing the vapor in a reflux condenser, heating the condensate in a reboiler, removing the purified chlorine gas from the distillation system, and removing the distillate from the distillation system. | 06-16-2011 |
20110172458 | Apparatus, Systems, and Methods for Purification of Isocyanate Mixtures - The present disclosure relates, according to some embodiments, to apparatus, systems, and/or methods for fractionating a feed mixture comprising, for example, one or more isocyanates, light components, solvents and/or heavier components. In some embodiments, fractionating an isocyanate feed mixture may comprise distilling the feed mixture in a non-adiabatic fractionating apparatus comprising a prefractionating section and/or column and a main section and/or column, which comprises a rectification section, a side section, and a stripping section. For example, isocyanates may be separated from light component(s), solvent(s) and/or heavier component(s). A fractionating apparatus may be configured and arranged, in some embodiments, as a dividing wall column. According to some embodiments of the disclosure, apparatus, systems, and/or methods may be energy efficient and/or may have a broad operating range. | 07-14-2011 |
20110213177 | PROCESS FOR PREPARING ISOCYANATES IN THE GAS PHASE - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, in the presence or absence of an inert medium, which comprises the following steps:
| 09-01-2011 |
20110213178 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of an inert medium, in which the amine and the phosgene are first mixed and converted to the isocyanate in a reactor, by cooling a reaction gas which comprises isocyanate and hydrogen chloride and leaves the reactor in a quench by adding a liquid quench medium to obtain a mixture of reaction gas and quench medium. The amount of quench medium added is such that the temperature of the mixture of reaction gas and quench medium which is established in the quench is above the dew point of the gas present in the quench. | 09-01-2011 |
20110230676 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates, comprising (a) the reaction of at least one amine with phosgene in the gas phase in a reaction zone and (b) the subsequent cooling of the reaction gases in a cooling zone by means of indirect cooling, the cooling medium which absorbs the heat of the reaction gases being conducted in countercurrent to the product stream at least in the region of the highest temperature in the cooling zone. | 09-22-2011 |
20110251425 | PROCESS FOR PREPARING AROMATIC ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber ( | 10-13-2011 |
20110257428 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which the amine and the phosgene are first mixed and converted to the isocyanate in a reactor, and in which a reaction gas ( | 10-20-2011 |
20110263892 | PROCESS FOR PREPARING AN ISOCYANATE - The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process. | 10-27-2011 |
20110275854 | PROCESS FOR THE PRODUCTION OF ALIPHATIC ISOCYANATES - The present invention is a process for aliphatic or cycloaliphatic isocyanate. The process comprises reacting an aliphatic or cycloaliphatic primary amine, with phosgene in the presence of an inert solvent wherein the initial reaction temperature is between 100 and 130° C. and the temperature is subsequently ramped to 150 to 180° C. during the course of the reaction, the solvent to amine weight ratio is 95:5 to 80:20, the total reaction pressure is maintained between 50 and 350 psig and the amine is rapidly dispersed in the phosgene through injection in a region of high efficiency mixing. | 11-10-2011 |
20110301380 | PROCESS AND APPARATUS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which the amine is evaporated in an evaporator to give an amine-comprising gas stream, the phosgene is mixed into the amine-comprising gas stream, and the amine and the phosgene are converted to the isocyanate in a reactor, wherein the temperature of surfaces in contact with the gaseous amine is kept above the dew point limit of the amine-comprising gas stream. The invention further relates to an apparatus for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, comprising an evaporator to evaporate the amine and a reactor in which the reaction is effected, and means of connection of evaporator and reactor, wherein surfaces which can come into contact with gaseous amine are provided with a coating which is not wetted by amine or have an averaged roughness depth Rz to DIN ISO 4287 of not more than 10 μm, and/or the apparatus has no dead spaces or thermal bridges. | 12-08-2011 |
20110306786 | USE OF A PISTON REACTOR TO IMPLEMENT A PHOSGENATION PROCESS - A process for phosgenating an amine comprising employing a plug-flow type reactor with internal recycle is disclosed. The process can be continuous, which makes it possible to prepare, in a single stage, a (poly)isocyanate with a good yield, without formation of byproducts and on simplifying the plant in order to carry out the process so as to promote safety. | 12-15-2011 |
20120004446 | PROCESS AND APPARATUS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which phosgene and amine are first evaporated and then superheated further to reaction temperature, and the superheated phosgene and amine are mixed and fed to a reactor in which the phosgene and the amine are converted to the isocyanate, wherein the residence time of the phosgene at temperatures greater than 300° C. is not more than 5 s, and/or the temperature of heat transfer surfaces in contact with phosgene is not more than 20 K above the phosgene temperature to be established. The invention further relates to an apparatus for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase. | 01-05-2012 |
20120095255 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by reacting the corresponding amines with phos-gene comprising (a) providing at least one amine-comprising feed stream and at least one phosgene-comprising feed stream, (b) mixing the feed streams to form at least one reaction mixture in a mixing zone, (c) reacting the at least one reaction mixture in a reaction zone and (d) working-up the product mixture obtained from (c). | 04-19-2012 |
20120101299 | PROCESS FOR THE PRODUCTION OF ISOCYANATES, PREFERABLY DIISOCYANATES AND POLYISOCYANATES WITH SOLVENT RECIRCULATION - The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and re-circulation of at least a portion of the solvent streams. | 04-26-2012 |
20120108844 | METHOD OF MEASURING ENTRY OF WATER INTO PHOSGENE-CONDUCTING PLANTS - The invention relates to a method of measuring entry of water and resulting corrosion in plants for producing isocyanates by reacting phosgene with one or more primary amines in a solvent. The invention further relates to an apparatus for producing such isocyanates, in the work-up section of which probes for monitoring corrosion are arranged in defined places. | 05-03-2012 |
20120108845 | PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE - Isocyanates are produced by reacting a primary amine with phosgene in the gas phase. In this process, the amine is vaporized and then superheated prior to introduction into the reactor. The amine is superheated to a temperature at least 10° C. above dew point before entry into the reactor. A pressure difference between the vaporizer and entry into the reactor of from 1 to 500 mbar is maintained. | 05-03-2012 |
20120123151 | PROCESS FOR PREPARING METHYLENEDI(PHENYL ISOCYANATE) - The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c). | 05-17-2012 |
20120123152 | PROCESS FOR THE PREPARATION OF ISOCYANATES - An isocyanate is produced by reacting an amine with a stoichiometric excess of phosgene in the gas phase. This reaction is carried out at a temperature above the amine's boiling point to obtain a liquid stream containing the isocyanate and a gas stream containing hydrogen chloride and phosgene. The gas stream containing hydrogen chloride and phosgene thus produced is separated into a gas stream containing hydrogen chloride and a liquid stream containing phosgene. At least part of the liquid stream containing phosgene is then converted to a gas stream containing phosgene which gas stream is then recycled. The gaseous phosgene stream is maintained at a higher pressure than the liquid phosgene stream. | 05-17-2012 |
20120142959 | METHOD FOR PRODUCING DIISOCYANATES BY GAS-PHASE PHOSGENATION - A process for preparing diisocyanates by gas-phase phosgenation starting out from a feed stream comprising the corresponding diamines and a phosgene-comprising feed stream, in which the feed streams are separately converted into the gas phase and preheated to the reaction temperature of the gas-phase phosgenation, wherein the waste heat from a plant for preparing chlorine by heterogeneously catalyzed oxidation of hydrogen chloride by the Deacon process is utilized for this purpose, is proposed. | 06-07-2012 |
20120157709 | PROCESS FOR PREPARATION AND PREFERABLY DISTILLATIVE WORKUP OF DIPHENYLMETHANE DIISOCYANATE (MDI) - What is proposed is a process for preparation and distillative workup of diphenylmethane diisocyanate (MDI), proceeding from a benzene-comprising feedstream, in which, in
| 06-21-2012 |
20120197038 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel. | 08-02-2012 |
20120232307 | TWO-STAGE PROCESS FOR COST-EFECTIVE DEPOSITION OF HOMOGENEOUS CATALYSTS IN MDA SYNTHESIS - The invention provides a process for preparing diphenylmethanediamine, comprising the steps of:
| 09-13-2012 |
20120302785 | METHOD FOR PRODUCING ISOCYANATES IN THE GAS PHASE - An isocyanate is produced by continuously reacting an amine with phosgene in the presence of an inert substance in the gas phase. In this process, a phosgene-containing stream and a stream containing both the amine and the inert substance are fed into a reactor. The molar ratio of the inert substance to the amino groups in the stream is greater than 0 but less than 45 mol %. This molar ratio changes by no more than 99% during a 20 minute period. | 11-29-2012 |
20120302786 | PROCESS FOR PREPARING POLYISOCYANATES FROM BIOMASS - The present invention relates to a process for preparing polyisocyanates from natural raw material sources, in which a composition comprising low molecular weight aromatics which comprise at least one hydroxy group or at least one alkoxy group per molecule (oxyaromatics) is produced from a biomass material, these oxyaromatics are converted into the corresponding aromatic amines and, optionally after condensation with formaldehyde, reacted further with phosgene to give compounds comprising isocyanate groups. | 11-29-2012 |
20130060062 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by reacting the corresponding amines comprised in at least one feed stream A with phosgene comprised in at least one feed stream P in a reaction plant comprising at least one mixing zone and at least one reaction zone, wherein feed stream A and/or feed stream P optionally comprise one or more inert material s and, | 03-07-2013 |
20130109883 | PROCESS FOR PREPARING ISOCYANATES AND/OR POLYISOCYANATES | 05-02-2013 |
20130131377 | METHOD FOR PRODUCING ISOCYANATES IN THE GAS PHASE - The invention relates to a process for the preparation of isocyanates by reaction of the corresponding amines with phosgene in the gas phase, wherein a diluent containing between 90.0000% by weight and 99.9999% by weight of substances which are inert in the phosgenation process and between 0.0001% by weight and 10.0000% by weight of oxygen is present during the conversion of the amine into the gas phase and the molar ratio of amine to oxygen (O | 05-23-2013 |
20130137892 | PROCESS FOR PREPARING ISOCYANATES BY PHOSGENATION OF THE CORRESPONDING AMINES IN THE GAS PHASE - A process for preparing isocyanates by phosgenation of the corresponding amines in a fluidized-bed reactor (R), wherein a gas stream ( | 05-30-2013 |
20130150620 | METHOD FOR PRODUCING ISOCYANATE - The invention relates to a process for preparing an isocyanate, which involves contacting fluid streams of amine, phosgene and inert medium in at least one mixing device, such that an inert medium stream is metered at least between one amine stream and one phosgene stream within the mixing device, and then reacting an amine with phosgene in a reaction chamber to form an isocyanate. In this process the inert medium stream is metered such that a point of first contact of the amine and the phosgene occurs at a distance from a surface of the mixing device, and a turbulent flow is present in the reaction chamber. | 06-13-2013 |
20130172604 | PROCESS FOR THE PRODUCTION OF METHYLENE DIPHENYL DIISOCYANATE ISOMER MIXTURES WITH SPECIFIC ISOMER DISTRIBUTIONS AND NEW PRODUCTS DERIVED - The present invention a process and apparatus for the production of methylene diphenyl diisocyanate (MDI) isomer mixtures with a low 2,2′-MDI isomer content and a high 2,4′-MDI isomer content. The resulting mixtures have an increased reactivity and are acceptable in food grade application due to the reduction in primary aromatic amines formed during the curing process. The process and apparatus also include controlling the amount of 4,4′-MDI, which is the most reactive isomer in the mixture allowing use in a wide variety of applications. | 07-04-2013 |
20130245314 | PROCESS FOR THE PRODUCTION OF ALIPHATIC ISOCYANATES - The present invention is an aliphatic or cycloaliphatic isocyanate obtained form a process comprising the steps of reacting an aliphatic or cycloaliphatic primary amine, with phosgene in the presence of an inert solvent, wherein the initial reaction temperature is between 100 and 130° C. and the temperature is subsequently ramped to 150 to 180° C. during the course of the reaction, the solvent to amine weight ratio is 95:5 to 80:20, the total reaction pressure is maintained between 50 and 350 psig and the amine is rapidly dispersed in the phosgene through injection in a region of high efficiency mixing. | 09-19-2013 |
20140114087 | PROCESS FOR PREPARING ISOCYANATES BY PHOSGENATION OF AMINES IN THE LIQUID PHASE - The present invention relates to a process for preparing isocyanates by reacting amines with phosgene in the liquid phase, where phosgene, hydrogen chloride and isocyanates are separated with stripping columns operated at different pressures. | 04-24-2014 |
20150080600 | PROCESS FOR PREPARING ISOCYANATES - The present invention relates to gas phase phosgenation of amines for preparation of isocyanates. In the present invention, phosgene is prepared by reacting chlorine with an excess of carbon monoxide in a gas phase. The obtained phosgene-containing reaction mixture is divided into two streams by a thermal and/or a membrane separating process. The first stream is a low-carbon monoxide stream of no more than 1% by weight of carbon monoxide, based on a total weight of the first stream. The second stream is a carbon monoxide-rich stream of more than 10% by weight of carbon monoxide, based on a total weight of the second stream. The first stream is used as the phosgene-containing reactant stream in the gas phase phosgenation of amines to prepare isocyanates. The second stream can be recycled into the phosgene synthesis. | 03-19-2015 |
20150126769 | METHOD FOR WORKING UP DISTILLATION RESIDUES FROM ISOCYANATE PRODUCTION - The present invention relates to a method for working up distillation residues from isocyanate production in which monomeric isocyanate present in distillation residues is recovered by means of a spray-dry method and the overall yield of monomeric isocyanate is thus significantly increased. | 05-07-2015 |
20150299111 | METHOD FOR PRODUCING ISOCYANATES IN THE GAS PHASE - The invention relates to a process for the preparation of isocyanates by reaction of the corresponding amines with phosgene in the gas phase, wherein a diluent containing between 90.0000% by weight and 99.9999% by weight of substances which are inert in the phosgenation process and between 0.0001% by weight and 10.0000% by weight of oxygen is present during the conversion of the amine into the gas phase and the molar ratio of amine to oxygen (O | 10-22-2015 |
20160068473 | PROCESS FOR THE PREPARATION OF DI- AND POLYAMINES OF THE DIPHENYLMETHANE SERIES - The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, wherein first aniline and formaldehyde are reacted in the absence of an acidic catalyst to form a reaction mixture containing aminal and water and, after the water has been separated, the aminal is reacted by acid catalysis to form a reaction mixture containing diamines and polyamines of the dephenylmethane series, wherein the separation of the water and aminal is supported by the use of a coalescence aid. According to the invention, a filter bed made of coalescence fiber material is used as coalescence aid. | 03-10-2016 |
20160068475 | METHOD FOR PRODUCING DIAMINES AND POLYAMINES OF THE DIPHENYLMETHANE SERIES - The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, wherein first aniline and formaldehyde are reacted in the absence of an acidic catalyst to form a reaction mixture containing aminal and water and, after the water has been separated the aminal is reacted by acid catalysis to form a reaction mixture containing diamines and polyamines of the diphenylmethane series, wherein the separation of the water from the aminal is supported by the use of a coalescence aid. According to the invention, a filter bed made from coalescence fiber material is used an coalescence aid. | 03-10-2016 |
20160152558 | METHOD FOR PRODUCING ISOCYANATES | 06-02-2016 |
20160376228 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a method for preparing isocyanates by phosgenating the corresponding amines, wherein low-boiling secondary components, excess phosgene, and the co-product hydrogen chloride are separated from the crude liquid isocyanate stream, which is obtained after the phosgenation has occurred, within a maximum of 60 minutes, and wherein the crude liquid isocyanate stream is not exposed to temperatures above 250° C. until said separation. | 12-29-2016 |
20220135517 | METHOD OF PRODUCING CARBONYL COMPOUND AND FLOW TYPE REACTION SYSTEM OF PRODUCING CARBONYL COMPOUND - There are provided a method of producing a carbonyl compound by a flow type reaction, including introducing a triphosgene solution, a tertiary amine solution, and an active hydrogen-containing compound solution into flow channels different from each other to cause the respective solutions to flow inside the respective flow channels, joining the respective solutions that flow inside the respective flow channels simultaneously or sequentially so that a reaction between phosgene and an active hydrogen-containing compound occurs, and obtaining a carbonyl compound in a joining solution, in which a non-aqueous organic solvent is used as a solvent of each of the respective solutions and a compound having a cyclic structure is used as the tertiary amine; and a flow type reaction system that is suitable for carrying out this production method. | 05-05-2022 |