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| Number | Title | Issue Date |
| 8183407 | Process for production of isocyanate, isocyanate produced by the process, and use of the isocyanate An isocyanate has been widely used as a starting material for the production of a polyurethane material, a polyisocyanurate material or the like which is suitably applicable to the field of optical materials. Disclosed is a process for producing an isocyanate which ... | 05/22/2012 |
| 8173833 | Method for the production of isocyanates The present invention relates to a process for preparing isocyanates. ... | 05/08/2012 |
| 8168818 | Method for producing isocyanates The invention relates to a process for preparing isocyanates in the gas phase. ... | 05/01/2012 |
| 8153838 | Process for producing isocyanates An isocyanate is produced by: (a) reacting chlorine with carbon monoxide to form phosgene, (b) reacting the phosgene with an organic amine to form an isocyanate and hydrogen chloride, (c) separating the isocyanate and hydrogen ... | 04/10/2012 |
| 8097751 | Process for preparing polyisocyanates by the adiabatic phosgenation of primary amines A two-stage process for the preparation of organic isocyanates by reacting primary amines with phosgene in which: a) in a first stage, amine and phosgene are reacted in an adiabatically managed reaction, in which the temperature of reaction is restricted to values b... | 01/17/2012 |
| 8063241 | 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 ... | 11/22/2011 |
| 8044235 | (Meth) acryloyl group-containing aromatic isocyanate compound and production process thereof A monomer is provided which is excellent in reactivity, can give high heat resistance and high refractive index, and has two or more polymerizable functional groups with different polymerization properties and an aromatic ring in the molecule. An industrial advantag... | 10/25/2011 |
| 7915444 | Method for producing diisocyanates The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. ... | 03/29/2011 |
| 7897805 | Polyisocyanate production method and polyisocyanate production system A polyisocyanate production method that can allow effective use of hydrogen chloride produced secondarily in a polyisocyanate production process, while allowing reduction of environmental burdens, and a polyisocyanate production system for performing the polyisocyan... | 03/01/2011 |
| 7897806 | 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. ... | 03/01/2011 |
| 7851648 | Method for the continuous production of isocyanates The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one re... | 12/14/2010 |
| 7754915 | Process for preparing isocyanates in the gas phase A process for preparing isocyanates in the gas phase, in which the mixing of the reactants and thus the reaction conditions are significantly improved by means of hydrodynamic measures such as increasing the turbulence of the feed stream in the central nozzle. As a ... | 07/13/2010 |
| 7709679 | Process for simultaneously preparing 4,4′-diphenylmethanediamine and diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates The invention provides a process for the simultaneous preparation of 4,4′-diphenylmethanediamine and also diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates, which comprises the steps a) preparation of a mixture of diphenylmet... | 05/04/2010 |
| 7615662 | Process for the preparation of isocyanates in the gas phase Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling tak... | 11/10/2009 |
| 7547801 | Process for the continuous preparation of isocyanates Isocyanates are produced by reacting an organic amine with phosgene in process which includes at least three stages. The first stage is carried out in a dynamic mixer. The second stage is carried out in at least one reactor. The third stage is carried out in at leas... | 06/16/2009 |
| 7541487 | Process for the preparation of isocyanates in the gas phase An isocyanate is produced by reacting a primary amine with phosgene in the gas phase above the boiling point of the amine over an average contact time of 0.05 to 15 seconds under adiabatic conditions. ... | 06/02/2009 |
| 7488842 | Method for producing isocyanates The invention relates to a process for preparing isocyanates by reacting amines with phosgene in the gas phase in a reaction zone, with the reaction mixture being passed through a zone into which a liquid is sprayed to stop the reaction, wherein the reaction mixture... | 02/10/2009 |
| 7368595 | Process for the production of light-colored isocyanates The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound for... | 05/06/2008 |
| 7358388 | Method for the purification of isocyanates Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified. ... | 04/15/2008 |
| 7312362 | Process for the production of di- and polyamines of the diphenylmethane series The present invention relates to a process for the production of mixtures of di- and polyamines of the diphenylmethane series (MDA) containing less than 1,000 ppm of water and less than 200 ppm of aniline by reaction of aniline and formaldehyde in the presence of ac... | 12/25/2007 |
| 7253321 | Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation The invention provides a process for the preparation of polyamines of the diphenylmethane series. This process comprises a) reacting aniline and formaldehyde in a molar ratio of 1.5:1 to 6:1, in the presence of an acid catalyst at ... | 08/07/2007 |
| 7230130 | Process for preparing methylenedianiline and methylenebis (phenylisocyanate) A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through ... | 06/12/2007 |
| 7211689 | Method for production of isocyanates In a process for preparing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, use is made of from 0.01 to 50 mol % of a sulfonamide, based on the total amount of primary amine and isocyanate formed in the reaction solution. | 05/01/2007 |
| 7205430 | Production of di- and polyisocyanates of the diphenylmethane series with defined acidity The invention relates to a process for the production of di- and polyisocyanates of the diphenylmethane series and mixtures thereof, in which aniline and formaldehyde are reacted in the presence of an acid catalyst to form di- and polyamines of the diphenylmethane s... | 04/17/2007 |
| 7205439 | Process for the preparation of di- and polyamines of the diphenylmethane series Di- and polyamines of the diphenylmethane series are prepared by a) mixing a first portion of aniline with an acid catalyst, b) mixing a second portion of aniline with formaldehyde, and c) mixing and reacting the mixtures prepared in each of steps a) and b). The dia... | 04/17/2007 |
| 7186857 | Process for the preparation of di- and polyamines of the diphenylmethane series The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and poly-isocyanates of the diphenylmethane series from these di- and poly-amines. The di- and poly-amines of the diphen... | 03/06/2007 |
| 7132495 | Polyisocyanate compound, method for producing the same, and uses thereof The invention provides an optical material being excellent in balance between the heat resistance, Abbe number and refractive index by providing a compound represented by the general formula (1): ... | 11/07/2006 |
| 7118920 | Multiphasic microchannel reactions Multiphasic reactions, especially those reactions using a phase transfer catalyst, are conducted in microchannel apparatus. Advantageously, these reactions can be conducted with two, planar microlayers of reactants in adjacent laminar flow streams. Microchannel appa... | 10/10/2006 |
| 7118653 | Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column Process for the purification of toluenediisocyanate from a crude distillation feed which includes toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude distillation feed in a dividing-wall distillation column into at lea... | 10/10/2006 |
| 7112694 | Method for producing isocyanates The present invention relates to a continuous process for preparing isocyanates by reacting primary amines with phosgene, wherein the reaction is carried out in a cascade of at least two tube reactors and the gas phase formed in the reaction is separated off in a ph... | 09/26/2006 |
| 7108770 | Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification Toluene diisocyanate is recovered from a crude distillation feed containing less than 2% by weight of phosgene by (a) fractionating the crude distillation feed containing less than 2% by weight of phosgene to remove the solvent and optionally the reaction res... | 09/19/2006 |
| 7084297 | Production of isocyanates in the gaseous phase The invention relates to a method for producing isocyanates by reacting primary amines with phosgene in the gaseous phase. Said method is characterized in that the reaction of amine and phosgene occurs in a reaction channel, the internal dimensions of which have a w... | 08/01/2006 |
| 7081548 | Process for preparing 3-chloro-5-nitrotoluene A preparation process of 3-chloro-5-nitrotoluene is provided in mild conditions. It is a process for preparing 3-chloro-5-nitrotoluene, which involves the steps of reacting 2-methyl-4-nitroaniline with a chlorinating agent such as 5-butyl hypochlorite in a neutral c... | 07/25/2006 |
| 7064233 | Method for producing isocyanates In a process for preparing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, use is made of from 0.01 to 50 mol % of a sulfoxide, a sulfone or a mixture thereof, based on the total amount of primary amine and isocyanate form... | 06/20/2006 |
| 7041776 | Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane series The invention relates to a method of producing polyisocyanates of the diphenylmethane series including the steps of a) reacting aniline and formaldehyde in the presence of HCl to provide a product mixture containing polyamines of t... | 05/09/2006 |
| 7038002 | Production of mixtures of diisocyanates and polyisocyanates from the diphenylmethane series with high contents of 4,4′-methylenediphenyl diisocyanate and 2,4′-methylenediphenyl diisocyanate A fraction of diisocyanates of the diphenylmethane series containing at least 95 wt. % binuclear methylenediphenyl diisocyanate is obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to produce diamines and polyamines of... | 05/02/2006 |
| 7019164 | Process for the production of (poly)isocyanates in the gas phase The present invention relates to a process for the production of an isocyanate corresponding to the formula R(NCO)n wherein R represents a (cyclo)aliphatic or aromatic hydrocarbon residue having up to 15 carbon atoms, preferably 4 to 13 carbo... | 03/28/2006 |
| 6979426 | Biodiesel production unit In a first aspect, systems and methods for producing biodiesel fuel include a modular production unit incorporated onto a single platform or into a housing for ease of relocatability. The modular production unit preferably includes a mixing unit, a reactor unit, a s... | 12/27/2005 |
| 6974880 | Process for the manufacture of (poly-)isocyanates in the gas phase The present invention relates to a process for the manufacture of diisocyanates by phosgenation of the corresponding diamines in which the vaporous diamines, optionally rarefied with an inert gas or with the vapors of an inert solvent, and phosgene are heated separa... | 12/13/2005 |
| 6949672 | Method for producing arylsulphonic acid isocyanates The present invention relates to a process for preparing arylsulfonyl isocyanates by reacting an arylsulfonamide with phosgene in the presence of a catalytically effective amount of an alkyl isocyanate. ... | 09/27/2005 |
