Patent application number | Description | Published |
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 |
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 |
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 |
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 |
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 |
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 |
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 |