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WO/2004/056756A1 |
The invention relates to a method for the continuous production of polyisocyanates by reaction of organic amines with phosgene, characterised in that the reaction occurs in at least three stages, whereby the first stage is in a mixing un...
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WO/2004/056759A1 |
The invention relates to a method for producing isocyanates by purifying a product flow resulting from isocyanate synthesis.
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WO/2004/056760A1 |
The invention relates to a method for producing (cyclo)aliphatic isocyanates by reacting, in an organic solvent, primary (cyclo)aliphatic amines with phosgene in the liquid phase, and to devices for carrying out this method.
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WO/2004/056761A1 |
The invention relates to a method for producing isocyanates by reacting amines with phosgene in the presence of inert organic solvents inside a reactor and by subsequently processing the reaction mixture exiting the reactor. The inventio...
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WO/2004/056758A1 |
The invention relates to a method for partially or completely separating a substance mixture consisting of hydrogen chloride and phosgene, optionally of solvents and optionally of low-boiling fractions and inert substances such as those ...
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WO/2004/037718A2 |
The invention relates to a method for producing chlorine by oxidising hydrogen chloride in the presence of a catalyst, whereby hydrogen chloride is not used in a gaseous form, but at least partially in the form of hydrochloric acid. In a...
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WO/2004/031132A1 |
The invention relates to a method for producing isocyanates by reacting primary amines with phosgene in a reactor and a production plant for carrying out said method. The discharged reaction material is provided in the form of a suspensi...
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WO/2004/026813A1 |
The invention relates to a method for producing aromatic diisocyanates by reacting phosgene with diamines in the gas phase. The reaction is carried out in a reaction chamber at moderate pressures, i.e. the pressure in said reaction chamb...
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WO/2004/014845A1 |
The invention relates to a method for producing organic isocyanates, said method consisting of the following steps: (a) a first partial quantity of chlorine containing < 400 ppm of free or bonded bromine and iodine is prepared; (b) a sec...
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WO/2003/099770A1 |
The invention relates to a continuous method for producing isocyanates by reacting primary amines with phosgene. The invention is characterized in that the reaction is carried out in a cascade of at least two tubular reactors and, after ...
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WO/2003/095419A1 |
The present invention relates to novel aromatic isocyanates obtained by partially hydrogenating naphthalene as well as the processes for preparing the same, and to their use as an isocyanate component in the production of polyurethanes.
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WO/2003/084921A1 |
Disclosed is a rector for thermally cracking monofunctional and/or polyfunctional carbamates into the corresponding isocyanate and hydroxyl components in the liquid phase, comprising devices which feed heat into the reactor. Said devices...
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WO/2003/082803A1 |
A method of preparing diaminodiphenylmethane and higher homologues thereof from aniline and formaldehyde in the presence of heterogeneous solid acid catalysts selected from (a) delaminated zeolites and/or (b) metal silicate catalysts hav...
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WO/2003/074477A1 |
The invention relates to a method for producing isocyanates made from carbamic acid esters, wherein (i) a mixture containing a single or multiple functional carbamic acid ester is continually introduced into a fission reactor or a cascad...
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WO/2003/068559A1 |
A dump body (10) for heavy vehicles comprises a casing with a base or bed (12) surmounted by a front wall (13) and two sides (14a, 14b) and which can be raised by any appropriate linear actuator, and a rear part (16). At the front portio...
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WO/2003/068359A2 |
The invention relates to an arrangement for carrying out chemical reactions, comprising at least one distillation column and/or at least one container, in addition to at least one circulation evaporator, which are connected to one anothe...
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WO/2003/045900A1 |
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...
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WO/2003/042170A1 |
The invention relates to a method for producing isocyanates by the reaction of the corresponding primary amines with phosgene in an inert solvent, whereby 0.01 to 50 mole % of a sulphonic acid amide is used, based on the total amount of ...
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WO/2003/037502A1 |
A chemical reactor and method of using the same. The reactor comprises first and second micro−engineered discrete flow passages (11, 15) for receiving chemical fluids. The first fluid passage (11) receives a first chemical fluid in whi...
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WO/2003/035606A1 |
The invention relates to a method for producing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent. According to said method, between 0.01 and 50 mol. % of a phosphine oxide is used, in relation to...
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WO/2003/035607A1 |
The invention relates to a method for producing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, while using 0.01 to 50 mole percent of a sulfoxide, a sulfone or mixtures thereof, based on the t...
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WO/2002/102763A1 |
The invention relates to a method for producing isocyanates by reacting primary amines with phosgene, and using isocyanate as the solvent. The inventive method is characterized in that a portion or the entire quantity of the isocyanate u...
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WO/2002/100915A1 |
A process for the continuous production of a polyisocyanate involving feeding a diisocyanate and an adduct containing at least one active hydrogen atom into a mixing zone, reacting the feedstocks to produce a polyisocyanate in an incline...
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WO/2002/094432A1 |
The invention relates to a method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent, whereby the method is carried out in a column provided with an ordered packing comprisin...
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WO/2002/070581A1 |
The invention relates to a method for producing MD1, comprising the following steps: A) aniline and formaldehyde are made to react in the presence of an acid to form methylene(diphenyldiamene) and polymethylene polyphenylene polyamine, t...
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WO/2002/055487A2 |
The invention concerns a method for using a carbamoyl fluoride as fluorinating agent. Said method consists in treating a derivative bearing a halogen-containing carbon, with a carbamoyl fluoride at a temperature not less than 70 °C and ...
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WO/2002/050020A1 |
The invention relates to a method for producing isocyanates, whereby at least one compound containing carbamate groups is converted into an isocyanate at a reaction temperature above the boiling point of an isocyanate thus arising. The r...
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WO/2002/024634A2 |
A phosgene-free process for producing organic isocyanates reacts an organic formamide with a diorganocarbonate and thermolyzing the reaction product to obtain the corresponding organic isocyanate. Byproducts may be cycled back to the rea...
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WO/2002/012176A2 |
The invention relates to a novel method for removing chlorine compounds from organic isocyanates or isocyanate mixtures by carrying out a treatment and an extraction using near-critical and/or supercritical fluids.
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WO/2002/008173A1 |
A process for the manufacture of polyisocyanate particles comprising the steps of: (i) melting the polyisocyanate; (ii) forming the molten polyisocyanate paste into drops on a cooling surface; (iii) forming solid pastilles by cooling the...
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WO/2002/002217A1 |
The invention relates to a method for mixing educt streams (1, 2; 5) in order to produce a product stream (10), using a mixer configuration (15, 16) that is provided with a number of educt feeding sites. An excess component stream of an ...
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WO/2001/091898A1 |
The invention relates to a method for mixing educt streams in a mixer (13) for phosgenating amines. According to said method, the reaction product (3) is led off in a closed manner and the educt streams (1, 2) contain organic solvents. T...
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WO/2001/064628A1 |
Process for the preparation of organic polyisocyanates by decomposing the corresponding organic polycarbamates into organic polyisocyanates and alcohols, characterised in that the alcohol and at least part of either the diisocyanates or ...
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WO/2001/060885A1 |
The invention relates to polyisocyanates of general formula (I), wherein R and R' are the same or different and mean alkyl groups having 1-4 C atoms and n is a number that amounts to 1.5 to 5 on average. The invention also relates to a m...
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WO/2001/056977A1 |
Integrated process for the preparation of aromatic isocyanates comprising: the reaction between an aromatic amine and an organic carbonate in the presence of a catalyst selected from organic and inorganic salts of a metal selected from Z...
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WO/2001/017951A1 |
The invention relates to a method for producing aliphatic, cycloaliphatic, araliphatic and aromatic monoisocyanates and oligoisocyanates by phosgenating the corresponding primary amines at normal pressure. The inventive method is charact...
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WO/2001/002347A1 |
The invention concerns a method for dehydrogenofluorination for transforming an aromatic carbamoyl fluoride into the corresponding isocyanate. Said method is characterised in that it consists in subjecting said carbamoyl fluoride to a te...
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WO/2001/000569A1 |
The invention relates to light isocyanates, to a method for producing light isocyanates and to their use in urethane compounds, especially in polyurethane, for example polyurethane foams.
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WO/2000/042009A1 |
The invention concerns the use of isocyanates obtained from amino acid derivatives for preparing and optionally isolating stable activated carbamic acid derivatives, or stable activated carbamates.
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WO/2000/040524A1 |
Disclosed is a method of preparing an aromatic compound having general formula (I) where R is CF¿3?, OCF¿3?, OC¿2?F¿5?, CN, NCO, or COCl, m is 0, 1, or 2, n is 0, 1, or 2, q is 1 or 2, and q+m+n is an integer from 1 to 5. A vapor is ...
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WO/1999/065868A1 |
The invention relates to a method for treating distillation residues from the synthesis of toluene diisocyanate by reacting the distillation residues with water. The invention is characterized in that the TDI distillation residues are re...
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WO/1999/054289A1 |
The invention relates to a 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 ...
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WO/1999/048863A1 |
The present invention relates to the use of 3.5-Di.tert.-butyl-4-hydroxy-phenyl propionic acid esters for stabilisation of organic polyisocyanates.
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WO/1999/047493A1 |
Organic carbamates are prepared by the reaction of organic amines (preferably aromatic polyamines) with heteroatom-substituted alkyl carbonates. Said carbamates can be thermolysed into the corresponding isocyanates.
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WO/1999/041218A1 |
The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated ...
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WO/1999/040059A1 |
The invention relates to a method for the production of methylenedi(phenylamine) by reacting aniline with formaldehyde in the presence of acid catalysts. The method is characterized in that aniline and optionally an acid catalyst are tre...
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WO/1999/001428A1 |
Hydrazine derivatives of formula (I) wherein Y signifies CO or SO¿2?; R?1¿ signifies lower alkyl, lower alkenyl, lower cycloalkyl, lower cycloalkyl-lower alkyl, aryl or aryl-lower alkyl; R?2¿ signifies lower alkyl, halo-lower alkyl, a...
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WO/1998/056758A1 |
Process for the production of organic isocyanates comprising the following steps: (1) reacting an amine compound with an organic carbonate in the presence of a catalyst and an organic solvent; (2) removing the catalyst; (3) thermally dec...
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WO/1998/054129A1 |
Method for the preparation of polymeric isocyanates by decomposing polymeric ureas of the formula: R?1�(NHCONR?2�R?3�)�x? wherein x is at least 2, R?1� is an organic radical of valency x and R?2� and R?3� are monovalent org...
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WO/1998/054128A1 |
Method for the preparation of aromatic monomeric or polymeric isocyanates by decomposing aromatic monomeric or polymeric carbamates of the formula R?1�(NHCOOR?2�)�x? wherein x is at least 1, R?1� is an aromatic radical of valency...
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