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Matches 1 - 50 out of 2,118

Document Document Title
WO/2021/063760A1
The invention relates to a process for the distillative purification of a crude isocyanate that is obtained by the phosgenation of a corresponding amine in a distillation apparatus under vacuum, in order to obtain the corresponding isocy...  
WO/2021/052894A1
The present invention concerns a method for producing an isocyanate, comprising the steps of (A) reacting an amine with a stoichiometric excess of phosgene, using an aromatic solvent of the formula C6H6–XClX, where X = 1 or 2, (a) as a...  
WO/2021/042251A1
The present invention belongs to the technical field of waterborne polyurethane resins, and in particular relates to a method for preparation of a polyisocyanate by a photochemical reaction and a method for preparing a waterborne polyure...  
WO/2021/039660A1
The present specification discloses a method for producing an isocyanate compound. The present invention relates to a method for producing a compound represented by formula (2), wherein in the presence of a water-immiscible solvent and w...  
WO/2021/033504A1
A method for producing a carbonyl compound by means of a flow reaction, wherein: a triphosgene solution is introduced into a flow path (I); the triphosgene solution comes into contact with a solid catalyst, which is affixed to at least a...  
WO/2021/033505A1
A method for producing a carbonyl compound by means of a flow reaction, wherein: a triphosgene solution, a tertiary amine solution and an active hydrogen-containing compound solution are introduced into different flow paths and are cause...  
WO/2021/027953A1
Disclosed is a preparation method for preparing diphenylmethane diisocyanate. The preparation method comprises: under a catalyst condition, performing a pyrolysis reaction on diphenylmethane dicarbamate in an inert solvent having a boili...  
WO/2021/028300A1
The present invention relates to a urethane group-containing polyisocyanate prepared by reacting a system containing organic polyhydroxy compounds and excess toluene diisocyanate and, a process for preparing the same, a product containin...  
WO/2021/008908A1
The invention relates to a method for producing polyisocyanates having a low monomer content, said method comprising the following steps: (i) modifying at least one monomeric diisocyanate to obtain a mixture containing at least one polyi...  
WO/2020/239716A1
The invention relates to a method for recycling polyurethane material waste (18a) for producing chemical feedstock for the production of isocyanates (10a) and then polyurethanes (16a), in which method, proceeding from polyurethane materi...  
WO/2020/225088A1
The invention relates to a method for the purification of at least one isocyanate selected from the group consisting of aliphatic, cycloaliphatic and araliphatic isocyanates and mixtures thereof, to a method for preparing at least one is...  
WO/2020/212510A1
The present invention is directed to methods for the asymmetric synthesis of esketamine. The present invention is further directed to key intermediates in the asymmetric esketamine synthesis. In one embodiment, the invention is an asymme...  
WO/2020/201277A1
The present invention relates to a drying apparatus for evaporating volatile constituents from a starting material to be dried, to a process for producing an isocyanate using this drying apparatus and to the use of the drying apparatus f...  
WO/2020/196553A1
The purpose of the present invention is to provide a method that enables efficient and safe production of an N-substituted trihaloacetamide which also serves as a synthetic intermediate for isocyanate compounds, carbamate compounds, urea...  
WO/2020/163092A1
Phenyl isocyanates are removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N,N-diphenylcarbodiimides. The N,N-dipheny...  
WO/2020/132936A1
Disclosed is a method for preparing an isocyanate in a gaseous phase, comprising feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing th...  
WO/2020/124622A1
Disclosed is a method for preparing isophorone diisocyanate. The method comprises the following steps: (1) reacting isophorone with hydrogen cyanide in the presence of a catalyst to obtain isophorone nitrile; (2) reacting the isophorone ...  
WO/2020/126716A1
A method for manufacturing an isocyanate compound represented by formula (2) (2) wherein R1 represents a methyl group,an ethyl group,a cyclopropyl group, a chlorine atom, a bromine atom, or a methoxy group; and R2 represents an alkyl gro...  
WO/2020/100971A1
The purpose of the present invention is to provide a method that makes it possible to safely and efficiently produce an isocyanate compound. This production method for an isocyanate compound is characterized by including: a step for irra...  
WO/2020/091867A1
Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can b...  
WO/2020/083830A1
The invention relates to a method for the thermal separation of a mixture comprising a first main component and a second main component, the boiling point of the first main component being lower than the boiling point of the second main ...  
WO/2020/040049A1
This composition includes a compound (A) represented by general formula (1) and a compound (B) represented by general formula (2), wherein the contained amount of the compound (B) is 0.00002-2.0 parts by mass with respect to 100 parts by...  
WO/2020/040048A1
This composition includes a compound (A) represented by general formula (1) and a compound (B) represented by general formula (2), wherein the contained amount of the compound (B) is 0.00002-0.2 parts by mass with respect to 100 parts by...  
WO/2020/040050A1
Provided are: a composition that has excellent stability during storage and excellent stability during use; and a production method for the composition. The composition according to the present invention includes a compound (A) represent...  
WO/2020/040045A1
Provided are: a composition that has excellent stability during storage and excellent stability during use; and a production method for the composition. This composition includes a compound (A) represented by general formula (1), and a c...  
WO/2020/027977A1
Phosgene is mixed with an organic polyamine to produce polyisocyanate compounds. A phosgene flow is established in a conduit (15), and the organic polyamine is injected into the phosgene flow. A constricted region (4) of the conduit (15)...  
WO/2020/016118A1
The present invention relates to a method for producing oligomeric polyisocyanates with subsequent fractional liquid-liquid extraction, wherein a solvent pair which forms two phases in the extraction and comprises a first solvent system ...  
WO/2020/016142A1
The invention relates to a method for recovering a diisocyanate which is solid at room temperature from a distillation residue from a process for producing the diisocyanate, comprising the following steps: (i) mixing the distillation res...  
WO/2019/245192A1
The present invention relates to a method for preparing aliphatic isocyanates. More particularly, the present invention relates to a method for preparing isocyanates with high purity that can efficiently recover unreacted materials and r...  
WO/2019/235862A1
Provided is a method for manufacturing diisocyanate and an optical lens in which, during the manufacture of diisocyanate from diamine via diamine hydrochloride, use is made of an aqueous hydrochloric acid solution and an organic solvent ...  
WO/2019/221210A1
Provided are a method for producing a carbamate, said method comprising the following steps (1) and (2), etc.: (1) a step for producing compound (A) having a urea bond by using an organic primary amine having at least one primary amino g...  
WO/2019/207494A1
Disclosed is a process for the synthesis of pimavanserin base with a high yield and purity, which comprises: a) converting tert-butyl-N-[(4-propan-2-yloxyphenyl)methyl]carbamate (Formula (I)) to 1-(isocyanatomethyl)-4-propan-2-yloxybenze...  
WO/2019/193073A1
The invention relates to a method for recovering monomer diisocyanates, which are solid at room temperature, from a distillation residue, said method comprising the following steps: (i) preparing at least one residue which contains diiso...  
WO/2019/185608A1
The present invention relates to a catalyst for preparing carbamates, in particular aromatic carbamates, comprising a binary oxide having the formula Li_xMx02, wherein 1. is a metal selected from the lanthanoid series and M is a metal se...  
WO/2019/145380A1
The invention relates to a process for the preparation of aliphatic, cycloaliphatic or araliphatic isocyanates by reacting at least one primary organic amine with a stoichiometric excess of phosgene in the gas phase, comprising the steps...  
WO/2019/134909A1
The invention relates to a method for producing methylene-diphenylene-diisocyanate and optionally a mixture of methylene-diphenylene-diisocyanate and polymethylene-polyphenylene-polyisocyanate, wherein, in a step α), a fraction (142) co...  
WO/2019/131855A1
Provided is a method for collecting a compound represented by general formula (III) (in the formula, R31 is a monovalent to trivalent organic group and n31 is an integer 1-3) from a liquid phase component that is formed as a by-product i...  
WO/2019/132491A1
An embodiment relates to an isocyanate composition with improved stability and reactivity and a plastic optical lens using the same. The isocyanate composition has improved stability since the content of chlorine in the composition is ad...  
WO/2019/115213A1
The present invention relates to a plant for preparing a purified isomeric methylene diphenyl diisocyanate monomer from a mixture of different isomeric monomers, wherein the plant comprises a distillation apparatus, which comprises: a) a...  
WO/2019/104888A1
Disclosed is an imine-type quaternary ammonium salt catalyst, wherein the catalyst has a general structure formula shown by formula I below; in the formula, R1 and R2, respectively, are independently selected from C1-C20 linear alkyl or ...  
WO/2019/076099A1
Disclosed are a light color modified isocyanate mixture and a preparation method therefor. The method comprises the following steps: a) reacting isocyanate groups of a raw material isocyanate under the action of a phosphorus heterocyclic...  
WO/2019/063295A1
The present invention relates to a process for the preparation of organic diisocyanates by cleaving the corresponding diurethanes into the diisocyanate and a hydroxy compound and separating the diisocyanate from the hydroxy compound by d...  
WO/2019/063296A1
The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes int...  
WO/2019/048371A1
The invention relates to a method for cleaning a phosgene-conducting apparatus by pressurization with ammonia gas to constant pressure. In this way, phosgene residues in the apparatus to be cleaned are decomposed effectively.  
WO/2019/048644A1
The present invention provides a process for quenching, in a quenching zone, a gaseous reaction mixture comprising a diisocyanate, phosgene and hydrogen chloride that is obtained in a reaction zone upstream of the quenching zone by phosg...  
WO/2019/050236A1
The present invention relates to a method for preparing a high-purity aliphatic isocyanate comprising an aliphatic polyisocyanate, wherein in the method, the occurrence of side reactions or the production of byproducts can be suppressed....  
WO/2019/048386A1
The invention relates to a method for cleaning a phosgene conducting apparatus, comprising: washing the apparatus with hot inert gas, followed by washing the apparatus with cold inert gas; conveying gaseous ammonia for breaking down phos...  
WO/2019/043180A1
The invention relates to a method for producing an isocyanate, wherein a carbamate or thiolcarbamate is converted, in the presence of a catalyst, with separation of an alcohol or thioalcohol, at a temperature of at least 150 °C, to the ...  
WO/2019/026425A1
Provided is a flow reactor with which safety can be ensured even if a leak occurs at a line connecting part. The flow reactor is provided with at least one line structure that comprises a feedstock supply line, a reactor section for reac...  
WO/2019/007834A1
The invention relates to a method for operating a production plant for producing a chemical product (1) by reacting a H-functional reactant (2) with phosgene (3) during an interruption in production when taking at least one plant part of...  

Matches 1 - 50 out of 2,118