Patent application number | Description | Published |
20080241021 | Distribution Device for a Gas-Liquid Phase Mixture for Apparatus - Distributor device ( | 10-02-2008 |
20090220391 | Distribution Device for a Gas-Liquid Phase Mixutre for Apparatus - A shell-and-tube reactor is disclosed. Contact tubes are disposed within a cylindrical housing and are secured to tube plates. Gas and liquid phases are received via a feed opening in a lower end cap and discharged via an upper end cap in the housing. A distributor device for a gas phase/liquid phase mixture is disposed below the lowermost tube plate. The distributor device includes a distributor plate and a predistributor. The distributor plate is arranged horizontally within the housing and includes an active area having through-openings and a downward-extending margin, but does not extend over the entire cross section of the housing. The predistributor includes a second distributor plate disposed between the feed opening and the first distributor plate, wherein the second distributor plate includes a second active area with second through-openings and a second downward-extending margin. | 09-03-2009 |
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 |
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 |
20100105951 | PROCESS FOR PREPARING DIPHENYLMETHANEDIAMINE - The invention provides a process for preparing diphenylmethanediamine, comprising the steps of
| 04-29-2010 |
20100189623 | METHOD FOR THE RECOVERY OF MINERAL ACIDS FROM SALINE SOLUTIONS - The invention relates to a process for recovering acids from product streams of organic syntheses, which comprises the steps
| 07-29-2010 |
20100210870 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates. | 08-19-2010 |
20100217035 | PROCESS FOR PREPARING ISOCYANATES - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 08-26-2010 |
20100305356 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates. | 12-02-2010 |
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 |
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 |
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 |
20120004445 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene, optionally in the presence of an inert medium, in which phosgene and amine are first mixed and converted to the isocyanate in a reactor, and in which a reaction gas which comprises isocyanate and hydrogen chloride leaving the reactor is cooled in a quench by adding a liquid quench medium to form a mixture of reaction gas and quench medium as the product stream. The walls of the quench are essentially completely wetted with a liquid. | 01-05-2012 |
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 |
20120016154 | 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, and in which a reaction gas which comprises isocyanate and hydrogen chloride and leaves the reactor is cooled in a quench space of a quench by adding a quench medium. The quench medium on addition to the quench space has a temperature above the condensation temperature or the desublimation temperature of the reaction gas. | 01-19-2012 |
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 |
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 |
20120157722 | PROCESS FOR PREPARING MONONITRATED ORGANIC COMPOUNDS - The present invention relates to a process for continuously preparing a mononitrated organic compound, especially a process for preparing mononitrobenzene. The invention relates more particularly to an improved continuous adiabatic process for preparing nitrobenzene. | 06-21-2012 |
20120172621 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a multistage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric polyurethanes and thermal dissociation of the latter, in which the polyisocyanates produced and unusable residues are separated off at particular stages of the reaction and reusable by-products and intermediates are recirculated to preceding stages. | 07-05-2012 |
20120226071 | PROCESS FOR PREPARING POLYISOCYANATES COMPRISING BIURET GROUPS - The present invention relates to a process for preparing polyisocyanates comprising biuret groups from diisocyanates or polyisocyanates and diamines. | 09-06-2012 |
20120226073 | METHOD AND APPARATUS FOR THE INTERMIXING OF TWO FLUID STREAMS - The subject of the present invention is an apparatus for the intermixing of a fluid stream with a fluid stream, which comprises a pipe through which the fluid stream is routed, at least two distributors for delivering the fluid stream being arranged inside the pipe, this arrangement of the distributors being made possible by bores in the casing of the pipe, and these distributors having a free flow cross section which is constant or decreases continuously, as seen in the main direction of flow of the fluid, and the distributors having one or more rows of holes for delivering the fluid into the fluid. | 09-06-2012 |
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 |
20120251435 | PROCESS FOR PREPARING ISOCYANATES - A process is proposed for preparing isocyanates by phosgenating the corresponding amines in the gas phase, which comprises
| 10-04-2012 |
20120253063 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing aromatic isocyanates by reacting the corresponding formamides with an oxygen-comprising gas over noble metal catalysts at temperatures of from 300 to 600° C. and a contact time of from 1 to 1000 ms, wherein:
| 10-04-2012 |
20120253072 | PROCESS FOR THE PREPARATION OF AROMATIC FORMAMIDES - The invention relates to a process for the preparation of formamides by reacting aromatic amines with a formic acid ester in the presence of a catalyst, wherein the catalyst is a phosphorus-containing acid or a Lewis-acidic metal salt. | 10-04-2012 |
20130006013 | PROCESS FOR THE PRODUCTION OF POLYISOCYANATES - The invention provides a multistage process for continuously preparing organic polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols into monomeric polyurethanes of low molecular mass, and the dissociation of said polyurethanes. The invention further provides an associated preparation process in which at certain reaction stages the polyisocyanates prepared and unutilizable residues are removed and reusable by-products and intermediates are recycled to preliminary stages. | 01-03-2013 |
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 |
20130072717 | REACTOR AND PROCESS FOR PREPARING PHOSGENE - A reactor ( | 03-21-2013 |
20130109883 | PROCESS FOR PREPARING ISOCYANATES AND/OR POLYISOCYANATES | 05-02-2013 |
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 |
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 |