Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 351 - 400 out of 2,505

Document Document Title
WO/2000/018719A1
An improved continuous process for removal of water from a process for producing organic carbonates, particularly diphenyl carbonate, by treating the water containing products of the reaction with a condensable stripping agent in a gaseo...  
WO/2000/012212A1
A process for producing dialkyl carbonates, such as dimethyl carbonate, from the reaction of a primary alcohol with urea in the presence of a novel catalyst which is a complex of organotin with a high boiling electron donor compound acti...  
WO/2000/009470A1
Carbonate ester is produced by acid hydrolysis of the reaction product of cupric alkoxide induced reaction between a hydroxy compound and a sulfur compound in a melt process. Diaryl carbonate is produced by hydrolysis of the resulting or...  
WO/2000/009466A1
Addition of phosphine ligands can produce high yields of tetraphenoxymethane, TPM, and diphenylcarbonate, DPC, in short reaction times and improved reaction rates by a copper-induced condensation of phenol and carbon disulfide, CS¿2?. E...  
WO/2000/005228A1
A process for decolorizing organic carbonates, for example, cyclic alkylene carbonates. The process involves contacting a discolored organic carbonate with hydrogen peroxide. A decolorized organic carbonate composition is also disclosed.  
WO/1999/064382A1
A process comprising feeding continuously a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage distillation column and forming (A) a dialkyl carbonate and (B) a diol, wherein a gaseous low boiling point mixt...  
WO/1999/052853A1
Dibenzyl carbonates are produced by reacting a dialkyl carbonate with a benzyl alcohol in the presence of a basic catalyst and by separating slightly volatile constituents of the reaction mixture and the catalyst. The inventive method en...  
WO/1999/038837A1
The invention concerns a method consisting in making a mixed (meth)acrylic anhydride of formula (I) by reacting an alkaline (meth)acrylate of formula (II) and a chloroformate of formula (III), carrying out said reaction in an aqueous med...  
WO/1999/018625A2
The invention relates to the application of at least one ester of general formula (I) to (V), whereby R?1¿, R?2¿, R?3¿, R?4¿ are the same or different and each, independent of one another, represent a linear or branched-chain C¿1? t...  
WO/1999/014183A1
A process for the preparation of aromatic carbonates by transesterification of a starting substance selected from the group consisting of dialkyl carbonates, alkyl aryl carbonates and mixtures of both with a reactant selected from the gr...  
WO/1999/011597A1
The invention concerns a method for phosgenation of monohydroxy alcohol's and/or polyols characterised in that it consists of treating alcohol and or polyol, whether in the presence of solvent or not, with a molar excess of phosgene, pre...  
WO/1999/008786A1
The invention relates to supported catalysts containing a metal from the platinum group. The catalyst supports contain mixed oxides of metals, transition metals and semiconducting elements which can act as redox catalysts in reaction con...  
WO/1999/008787A1
The invention relates to mixed oxide catalysts containing a metal from the platinum group, preferably (Si/Mn/Pd), which were produced in a sol-gel process. The invention also relates to their use in a method for producing diarylcarbonate...  
WO/1999/006142A1
Aromatic carbonates can be prepared economically and efficiently by reacting an aromatic hydroxyl compound with carbon monoxide and oxygen in the presence of a catalyst which comprises a perovskitic composite oxide represented by the fol...  
WO/1998/054240A1
A process for the preparation of an aromatic polycarbonate by transesterification of a diaryl carbonate with an aromatic dihydroxy compound, characterized in that the diaryl carbonate is one which is prepared by decarbonylation of a diar...  
WO/1998/047870A1
This invention is concerned with a new and improved process for the large scale production of 4-[6-(hexylcarbamoyloxy)hexylcarbamoyloxy]-piperidine-1-carb oxylic acid 4-phenoxyphenyl ester, disclosed in European Patent Application 0 635 ...  
WO/1998/030533A1
Novel catalysts for the synthesis of a alpha-chlorinated chloroformate from an aldehyde and phosgene are described. The catalysts include alkyl substituted guanidines, hexasubstituted guanidinium chlorides, substituted biguanidinium chlo...  
WO/1997/047586A1
An aromatic carbonic ester is prepared continuously and efficiently by reacting an aromatic carboxylic ester with an aliphatic carbonic ester and/or an aromatic/aliphatic carbonic ester through transesterification. A raw material compris...  
WO/1997/047583A1
The claim is for a process for producing higher dialkyl carbonates of the formula (I) (R1O)(R2O)CO, in which R1 and R2 are a linear or branched, saturated, unsaturated and/or alkoxylated alkyl radical, by the transesterification of lower...  
WO/1997/044108A1
A reaction distillation apparatus which can be applied to a relatively complicated reaction comprising the combination of two or more stages of equilibrium reactions, and a reaction distillation method which can efficiently conduct this ...  
WO/1997/023445A1
A process for continuously preparing dialkyl carbonates and diols, comprising the steps of: feeding a cyclic carbonate and an aliphatic monohydric alcohol into a continuous multistage distillation column; conducting transesterification i...  
WO/1997/011049A1
A process for the preparation of an aromatic carbonate by subjecting a starting compound selected from the group consisting of dialkyl carbonates, alkyl aryl carbonates and mixtures thereof and a reactant selected from the group consisti...  
WO/1997/003104A1
Disclosed are liquid to highly viscous oligocarbonates and polycarbonates containing as polyol components polyols having more than 20 C atoms, in particular so-called dimer diols or their commercially available technical mixtures. Also d...  
WO/1996/014289A1
Fluorobutenyl esters have the formula (I), in which R1 stands for hydrogen or a halogen, and R2 stands for one of the groups (a), (b) or (c), in which V, Y, Z, R3 and R5 have the meanings given in the description. Also disclosed are a pr...  
WO/1996/003366A1
The present invention relates to novel substituted bicyclic 2-mesityl cyclopentane-1,3-dione derivatives of the formula (I) in which A and Q together are alkane diyl or alkene diyl which may be substituted by alkyl, alkoxy, alkylthio, cy...  
WO/1995/025083A1
A process of preparing diaryl carbonates, such as diphenyl carbonate, and aryl haloformates, such as phenyl chloroformate. The process involves contacting phenol or a substituted phenol with a carbonyl halide, such as phosgene, in the pr...  
WO/1995/017369A1
A process for making a dialkyl carbonate which comprises reacting urea with a first alcohol in a carbamate reactor at a temperature and pressure sufficient to convert said urea to an alkyl carbamate; and reacting the alkyl carbamate with...  
WO/1995/017371A1
A catalyst for aryl ester production, which contains a microporous material containing a Group IV metal element, is insoluble in reaction fluids and hence can be used as a heterogenous catalyst. Thus it can permit an aryl ester to be pro...  
WO/1995/011226A1
A substituted benzene derivative of formula (I), wherein A is an aryloxy group which may be substituted, an arylthio group which may be substituted or -ON=C(R1)R2, each of R1 and R2 which are independent of each other is an alkyl group w...  
WO/1995/004796A1
A process for depolymerizing polymers by selective, partial oxidation at supercritical or near supercritical conditions for water and wherein supercritical water or water near supercritical conditions is used as a solvent and reforming a...  
WO/1994/022805A1
The proposal is for a process for producing dialkyl carbonate from CO2 in which the reaction with the alkoxy group of an alkoxy compound is performed at high temperature and pressure in the presence or absence of a catalyst. Preference i...  
WO/1994/011335A1
A process for producing a carbonic diester by the catalytic reaction of carbon monoxide with a nitrous ester in the presence of a solid catalyst, characterized by adding a minute amount of a chloroformic ester to the feedstock gas compri...  
WO/1994/008952A1
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in...  
WO/1994/006749A1
Di(organo) esters of pyrocarbonic acid, e.g., dialkyl pyrocarbonates, such as diethyl pyrocarbonate, are prepared by reaction of the corresponding organohaloformate with aqueous alkali metal hydroxide, e.g., sodium hydroxide, in the subs...  
WO/1993/014059A1
An integrated process for the production of dimethyl carbonate is disclosed. The process utilizes oxygen and an inexpensive carbon source such as natural gas as reactants. Other reactants are generated within the process and used without...  
WO/1993/007116A1
Fungicidal compounds having formula (I), wherein W is CH3O.CH=CCO2CH3, CH3ON=CCONR3R4 or CH3ON=CCO2CH3 and stereoisomers thereof; n is 0 or 1; X is oxygen or sulphur; Z is oxygen, sulphur or NR1; R1 is hydrogen or alkyl optionally substi...  
WO/1993/003000A1
Improved yields of aromatic organic carbonates made by the palladium catalyzed direct carbonylation of aromatic organic hydroxy compounds can be achieved if the total gas pressure and partial pressure of carbon monoxide and oxygen are su...  
WO/1992/019664A1
Water-soluble, biologically decomposable carbonic acid polyesters have general formula (I), in which R�1? represents a straight- or branched-chain, saturated or monosaturated alkyl residue having 6 to 22 C atoms; R�2? represents hydr...  
WO/1992/018458A1
A diaryl carbonate is produced by transesterification of a dialkyl carbonate, such as dimethyl carbonate, with an aromatic hydroxy compound, such as phenol, in three successive reaction zones. A transesterification catalyst, such as a ti...  
WO/1992/010464A1
4,5-Dihydroxy- and 4,5,8-trihydroxy- 9,10-dihydro-9,10-dioxo-2-anthracenecarboxylic acid dicarbonates and urethans having therapeutical activities, a process for the preparation thereof and pharmaceutical compositions containing them.  
WO/1992/010462A1
Guerbet carbonates are disclosed having the formula (I), in which R?1¿ stands for a branched alkyl residue with 12 to 44 carbon atoms and R?2¿ stands for R?1¿ or for a linear alkyl residue with 1 to 12 carbon atoms. To produce these c...  
WO/1992/009555A1
A process for the preparation of an aromatic carbonate from a phenol, acetic anhydride, carbon monoxide and oxygen comprising the steps of A) reacting acetic anhydride with phenol to form phenyl acetate; B) reacting the phenyl acetate wi...  
WO/1992/007816A1
The present invention provides a process for the preparation of alkoxycarbonyloxystyrene comprising reacting acyloxystyrene with a strong base to yield a phenolate to which is added an alkoxycarbonylating agent in an organic solvent and ...  
WO/1992/006066A1
A process for producing diester of carbonic acid safely in a stabilized manner with high selectivity and yield, which comprises conducting the vapor-phase catalytic reaction of carbon monoxide with nitrous ester in the presence of a soli...  
WO/1991/010639A1
The present invention relates to hitherto unknown intermediate of formula (I), in which R1 stands for hydrogen or a straight or branched aliphatic C1-C20 carbon chain or an aryl or aralkyl group, aryl and "ar" meaning an aromatic or hete...  
WO/1991/009832A1
A process for continuously producing an aromatic carbonate or its mixture corresponding to the starting material comprising dialkyl carbonate, alkyl aryl carbonate or a mixture thereof and the reactant comprising aromatic hydroxy compoun...  
WO/1991/006526A1
A process and a heterogeneous catalyst for the production of diaryl carbonates from the reaction of an aromatic hydroxy compound and a carbonyl halide and elimination of anhydrous hydrogen halide. The catalyst comprises a salt containing...  
WO/1990/015791A1
Carbonic esters are important as an extender for gasoline, an octane number improver and an organic solvent, and further as a substitute for phosgene used in the production of isocyanates, polycarbonates and intermediates of various agri...  
WO/1990/011995A1
Novel oxo-ionol derivatives are described which have a but-1-en-3-ol carbonate side chain. These derivatives are stable tobacco enhancers which impart a slight hay-like flavor to tobacco smoke.  
WO/1989/007587A1
A carbonic acid ester is produced by reacting an alcohol with both carbon monoxide and oxygen in the presence of a catalyst comprising a divalent copper atom in the form of a weak acid salt and/or halide and an alkaline earth metal in th...  

Matches 351 - 400 out of 2,505