Matches 1 - 50 out of 157 1 2 3 4 >


Match Document Document Title
8110704 Process for the production of stable polymers  
Stable NCO prepolymers are produced from polyisocyanates having a melting point greater than 70° C., preferably, naphthalene diisocyanate, having advantageous physical properties. An important ...
8088944 Method for the purification of isocyanates  
Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
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...
8034972 System and process for production of toluene diisocyanate  
A method for producing toluene diisocyanate is disclosed which comprises forming a dispersion comprising phosgene gas bubbles dispersed in toluene diamine liquid phase, wherein said gas bubbles...
7842277 Molecular sieve composition, a method of making and a process of using the same  
This disclosure relates to a crystalline MCM-22 family molecular sieve composition having, in its as-synthesized form, an X-ray diffraction pattern including a peak at d-spacing maximum of...
7649108 Process for the distillation of a mixture of isomeric diisocyanatodiphenylmethanes  
A mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2′-diisocyanato-diphenylmethane, 2,4′-diisocyanatodiphenylmethane and 4,4′-diisocyanatodiphenyl-methane is distilled in at...
7645900 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...
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...
7595422 Process for conditioning isocyanates  
The invention relates to a novel process for conditioning isocyanates. The purpose of conditioning of isocyanates or of mixtures of isocyanates is to remove organophosphorus components in a...
7592479 Reprocessing of reaction material discharged from phosgenation reactors  
Isocyanates are prepared by reacting primary amines with phosgene in a reactor by a process in which a reaction discharge is present in the form of a suspension which contains the isocyanate to be...
7544832 Reaction column in a special combination with a natural circulation evaporator  
An arrangement for carrying out chemical reactions comprises at least one distillation column and/or at least one container and at least one circulation evaporator, which are connected to one...
7524405 Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent  
The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction...
7504533 Process for the production of isocyanates  
Isocyanates are produced by a) reacting at least one amine with phosgene, optionally in the presence of a solvent to produce the corresponding isocyanate and a stream containing hydrogen chloride,...
7495124 Process for the production of very pure 2,4′-methylenediphenyl diisocyanate  
The present invention relates to a process for the production of MDI fractions containing 2,4′-MDI, and in which the 2,2′-MDI component from the MDA production is largely removed from the iso...
7358388 Method for the purification of isocyanates  
Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
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...
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...
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...
6982026 Azeotropic distillation process for producing organic acids or organic acid amides  
Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the...
6966992 Method of purification of molecules using unbranched terminal alkyldiols  
The current invention provides methods for molecule purification by RP-LC and RP-HPLC that uses unbranched terminal alkyldiols as eluting solvents. In particular, the present invention purifies...
6803483 Process for the purification of mixtures of toluenediisocyanate  
A process for the purification of toluenediisocyanate by fractionating a crude distillation feed containing toluenediisocyante, an organic solvent and less than 2% by weight of phosgene in a heat...
6800781 Process for quenching a gaseous reaction mixture during the gas phase phosgenation of diamines  
The present invention provides a process for quenching a gaseous reaction mixture during the phosgenation of diamines in the gas phase to produce diisocyanates. The gaseous reaction mixture...
6673960 Work-up of distillation residues from the synthesis of toluene diisocyanate  
A process for working up distillation residues from the synthesis of tolylene diisocyanate by reaction of the distillation residues with water comprises reacting the TDI distillation residues with...
6664415 Process for preparing organic monoisocyanates  
The present invention relates to a process for preparing a low boiling monoisocyanate having a boiling point of between 70 and 320° C. at standard pressure by reacting A) a high boiling isocyanate ...
6639102 Process for producing polyisocyanates of the diphenyl methane series having a reduced color value  
Polyisocyanates of the diphenyl methane series having reduced color values are obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to form a polyamine, b)...
6576788 METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX  
In a process for preparing mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced content of chlorinated by-products and a reduced iodine color...
6395925 Process for purifying organic isocyanates, the organic isocyanates so purified and their use  
The invention provides a new process for purifying organic isocyanates or isocyanate mixtures by mixing the isocyanates or isocyanate mixtures to be purified with at least one alcohol and/or thiol...
6391161 Method for reducing the chlorine content of low molecular weight isocyanates  
An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The...
6271414 Process for the isomeric separation of isocyanates  
A process is described for obtaining pure isocyanate isomers from a mixture of isocyanate isomers by suspension crystallization and the isolation of isomerically pure crystals, which is...
6229043 Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced iodine color number and a reduced chlorine content  
Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (raw MDI) having a reduced iodine color number and a reduced chlorine content are prepared by reacting the...
6222066 Process for decreasing the chlorine content of organic isocyanates  
A process for the purification of organic isocyanates or isocyanate mixtures in which the amount of chlorine compound(s) present is reduced by mixing the isocyanate(s) or isocyanate mixtures with a...
6140382 Process for the preparation of isocyanates or isocyanate mixtures useful for the preparation of polyurethane foams  
Isocyanates or isocyanate mixtures which are substantially free of color-imparting components are made by treating the isocyanate with hydrogen in the presence of a catalyst at a pressure of from...
5962728 Isocyanate residue purification  
The present invention relates to a process for isolating aliphatic isocyanate monomer(s) from a liquid or viscous paste composition comprising polymeric isocyanate residues and the aliphatic...
5889070 Process for preparing polyamines and polysocyanates  
Disclosed herein is an improved process for preparing a polyamine mixture derived by reacting aniline with formaldehyde in the presence of an acid catalyst the improvement comprising mildly...
5786506 Process for distillation of crude isocyanate concentrates  
A process is described for the separation and recovery of isocyanate monomers from isocyanate concentrates which leaves a residue which is liquid and burnable. The process for the separation and...
5783727 Production of 2,6-toluylene diisocyanate from a mixture comprising 2,6-toluylene diisocyanate and 2,4-toluylene diisocyanate  
A method for obtaining substantially pure toluylene 2,6-diisocyanate from a mixture of the 2,4 and 2,6 isomers of toluylene diisocyanate, wherein at least one crystallizing-melting cycle is...
5750629 Uretdione diisocyanates and a process for their production  
The present invention relates to a process for preparing pure bis(isocyanatoalkyl)monouretdiones corresponding to formula (I) ##STR1## wherein R represents identical or different, linear or...
5703193 Removal of unreacted diisocyanate monomer from polyurethane prepolymers  
A process for reducing the amount of residual organic diisocyanate monomer in a polyurethane prepolymer reaction product mixture which comprises distilling the polyurethane prepolymer reaction...
5606001 Polyisocyanates containing allophanate groups and optionally isocyanurate groups  
The present invention relates to a polyisocyanates containing allophanate groups and optionally isocyanurate groups that are prepared by reacting compounds which i) are substantially free of...
5451697 Process for preparing isocyanates  
A process for preparing isocyanates comprising contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a...
5446196 Process for the production of isocyanates and for the continuous working-up of the residue  
Pure isocyanate is recovered from an isocyanate-containing residue of a phosgene/amine reaction mixture by continuously feeding such residue and a high boiling hydrocarbon such as bitumen to a...
5386054 Process for the purification of polyisocyanates, the polyisocyanates thus purified and use thereof  
A process for the purification of organic polyisocyanates by mixing of the polyisocyanate with from 0.001 to 1% by weight of compounds containing trimethylsilyl groups at temperatures of from 20° ...
5364958 Process for the production of methylene-crosslinked polyphenylene polyisocyanate  
The hue of a methylene-crosslinked polyphenylene polyisocyanate continuously produced by the reaction with phosgene in an inert solvent of a polyamine mixture obtained by condensation of aniline...
5354432 Process for the production of isocyanates and for working up the residue  
A process for the production of pure distilled isocyanates in which the corresponding amine is reacted with phosgene in a suitable solvent and working up of the isocyanate containing solution...
5349082 Toluene diisocyanate residue  
Disclosed herein is a process for recovering toluene diisocyanate (TDI) from a TDI residue solution, comprising mixing the residue solution with a polyisocyanate consisting essentially of...
5314588 Process for recovering polysocyanates from the distillation residues obtained in the production of tolylene diisocyanate  
A process for recovering a distillate of tolylene diisocyanate and an isocyanate-group-containing sump product containing less than 200 ppm (by weight) tolylene diisocyanate from A) distillation...
5312971 Color reduction of polymethylene polyphenyl polyisocyanates  
The present invention is directed to a process for the production of polymethylene polyphenyl polyisocyanates by phosgenating the corresponding polyamines in solution in an inert organic solvent,...
5300616 Process for isolating polyisocyanate isomers from polyisocyanate mixtures  
Polyisocyanate mixtures are isolated in pure or more concentrated form from isomeric mixtures by liquid-liquid extraction using a two-phase system. The two phases are 1) a non-polar solvent phase...
5298431 Process for producing low viscosity isocyanate trimers  
This invention relates to a multi-step process for isolating a cyclotrimerized isocyanate from mixture containing said cyclotrimerized isocyanate plus an isocyanate oligomer which comprises the...
5284969 Process for the production of polyisocyanates  
A process for the continuous catalyst-free production of polyisocyanates by thermal decomposition of the N-substituted carbamic acid esters corresponding to the polyisocyanates, in which the...
Matches 1 - 50 out of 157 1 2 3 4 >