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7629485 |
Process for producing aromatic carbonate
Production of an aromatic carbonic ester through an ester exchange reaction between a starting material and a reactant while distilling by-product alcohols and/or by-product dialkyl carbonates off...
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7622601 |
Process for production of high-purity diaryl carbonate
A specific industrially useful process for the production of a high-purity diaryl carbonate in which a diaryl carbonate having low contents of intermediate boiling point and high boiling point...
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7598411 |
Processes for producing carbonic ester and producing polycarbonate
A process for producing a carbonic ester, characterized in that an aromatic monohydroxy compound or an aliphatic monohydroxy compound is subjected to oxidative carbonylation with carbon monoxide...
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7584629 |
Separation of a substance mixture consisting of hydrogen chloride and phosgene
The invention relates to a process for the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are...
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7541482 |
Process for production of alkyltin alkoxides
A process for the production of alkyltin alkoxides which comprises subjecting at least one alkyltin compound selected from among organotin compounds having tin-oxygen-tin linkages as the starting...
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7531616 |
Process for industrial production of an aromatic carbonate
It is an object of the present invention to provide a specific process that enables aromatic carbonates to be produced with high selectivity and high productivity stably for a prolonged period of...
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7498399 |
Method of preparing ester-substituted diaryl carbonates
An improved method for the preparation of ester-substituted diaryl carbonates prepared by reacting phosgene with recycle streams of ester-substituted phenols from reaction processes using a...
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7417161 |
Continuous method for preparing aromatic carbonate using a heterogeneous catalyst and a reaction apparatus for the same
The present invention relates to a continuous method for the preparation of an aromatic carbonate by reacting a dialkyl carbonate and an aromatic hydroxy compound in the presence of a heterogeneous...
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7378540 |
Process for producing organic carbonates
A process for producing various organic carbonates by performing transesterification and disproportionation reactions in dual vapor/liquid phase mode preferably in the presence of solid catalyst...
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7339070 |
Method and apparatus for waste stream recovery
A method for recovering a product mixture from a waste stream in a diaryl carbonate manufacturing process comprising reacting the waste stream with an alkyl alcohol to form a reaction mixture, and...
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7297754 |
Method for the preparation of aromatic chloroformates
A method for preparing an aromatic chloroformate comprising, introducing a mixture of at least one aromatic hydroxyl compound, phosgene, at least one solvent, and at least one organic base into a...
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7288668 |
Process for making diaryl carbonate
Diphenyl carbonate is produced by reacting phenol with diethyl carbonate in a series of fixed bed reactors each of which is connected at different position on a distillation column via side draw...
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7151189 |
Method and apparatus for waste stream recovery
A method for recovering a product mixture from a waste stream in a diaryl carbonate manufacturing process comprising reacting the waste stream with an alkyl alcohol to form a reaction mixture, and...
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7141641 |
Method and apparatus for production of alkyl aryl ether and diaryl carbonate
A method and apparatus for continuously producing an alkyl aryl ether and a diaryl carbonate by reacting a dialkyl carbonate and an aromatic alcohol in presence of a transesterification catalyst.
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7094917 |
Processes for refining compositions containing dialkyl carbonates
Processes for refining dialkyl carbonate-containing compositions are described, wherein a composition comprising a dialkyl carbonate is provided; and the composition is subjected to a rectification...
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7084291 |
Water resistant catalyst for the production of diaryl carbonates via the direct carbonylation of phenolic compounds
A method of increasing the amount of diphenylcarbonate produced per amount of catalyst consumed in a phenol carbonylation process is described. Phenolic carbonylation produces water as a reaction...
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RE38995 |
Interfacial method of preparing ester-substituted diaryl carbonates
High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of methyl salicylate with phosgene in the presence of a phase transfer...
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6914149 |
Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization
A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst...
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6891015 |
Solventless preparation of ester-substituted diaryl carbonates
High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of ester-substituted phenols with phosgene in the presence of a phase...
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6852872 |
Process for producing diaryl carbonates
A process for producing diaryl carbonate is disclosed. The process entails forming a reaction mixture wherein reacting are an aromatic hydroxy compound corresponding to the formula
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6835858 |
Catalytic conversion of an organic carbonate
The invention relates to a method for the catalytic conversion of organic carbonate to the corresponding alcohol, wherein the organic carbonate is contacted with alcohol and/or water in the...
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6800779 |
Method for producing aromatic carbonates
A method for economically producing aromatic carbonates from aromatic hydroxy compounds is disclosed which in one embodiment comprises the steps of: (i) contacting at a temperature sufficient to...
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6720443 |
Catalyst and process for the preparation of aromatic carbonates
Aromatic carbonates can be prepared economically and efficiently by reacting an aromatic hydroxy compound with carbon monoxide and oxygen in the presence of a catalyst wherein a palladium compound...
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6706908 |
Method and catalyst composition for producing aromatic carbonates
The present invention provides a method and catalyst composition for carbonylating aromatic hydroxy compounds, comprising the step of contacting at least one aromatic hydroxy compound with oxygen...
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6703473 |
Process for producing polycarbonate
An improvement to the melt transesterification reaction of diaryl carbonate with dihydroxy aryl compound is disclosed. The improvement entails the following steps (i) introducing the resulting...
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6700009 |
Method and catalyst system for producing aromatic carbonates
A method and catalyst system for economically producing aromatic carbonates from aromatic hydroxy compounds. In one embodiment, the present invention provides a method of carbonylating aromatic...
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6680400 |
Continuous process for the production of carboxylic acid diaryl esters
An improvement to the interfacial boundary process for continuous production of carbonic acid diaryl esters is disclosed. The process that entails a reaction of monophenols in an inert solvent, in...
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6605191 |
Method for reprocessing reaction mixtures containing diaryl carbonate
A process for the work up of a reaction mixture obtained from the preparation of diaryl carbonate by direct carbonylation of aromatic hydroxy compounds is disclosed. The process entails obtaining a...
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6600061 |
Method for the continuous production of aromatic carbonates
The present invention provides a method for making aromatic carbonates. In this method, an aryl alcohol is reacted with a dialkyl carbonate in a reactor (e.g., a distillation column) to produce an...
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6596896 |
Process for producing aromatic carbonate
A process for producing an aromatic carbonate by reacting an aromatic monohydroxy compound with carbon monoxide and molecular oxygen, wherein the reaction is carried out in the presence of: (a)...
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6596895 |
Method for the continuous production of poly carbonates
The present invention provides a method for making polycarbonates. One embodiment of the method comprises reacting diphenylcarbonate with a dihydric phenol. The diphenylcarbonate is made by...
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6548445 |
Supported catalysts containing a platinum metal and process for preparing diaryl carbonates
In the process for preparing an aromatic carbonate from an aromatic hydroxy compound, CO and O 2 in the presence of a quaternary salt and a base using a platinum metal catalyst and a cocatalyst,...
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6548691 |
Process for producing carbonic acid diaryl ester
An improvement to the interfacial boundary process for producing carbonic acid diaryl esters is disclosed. In the two-stage process that entails phosgene and monophenols reaction in an inert...
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6531623 |
Continuous process for producing carbonic acid diaryl ester
A two stage interfacial polycondensation process for the production of carbonic acid diaryl ester is disclosed. The invention concerns an improvement to the process that entails forming in a first...
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6521777 |
Process for the production of diaryl carbonates
A process for catalytic production of diaryl carbonates by oxidative carbonylation of aromatic hydroxy compounds with carbon monoxide and oxygen achieves water removal during reaction by a process...
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6509489 |
Catalyst compositions for producing aromatic carbonates
A method and catalyst system for producing aromatic carbonates from aromatic hydroxy compounds. In one embodiment, the method includes the step of contacting at least one aromatic hydroxy compound...
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6506924 |
Method for recovery of catalyst components
A method is disclosed for recovering a substantially water-soluble solvent from a reaction mixture comprising at least about 35% by weight aromatic hydroxy compound, which comprises the steps of:...
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6441215 |
Method for reducing carbonate decomposition in reaction mixtures
The present invention is directed to a method for reducing the percent decomposition of an aromatic carbonate in a first reaction mixture comprising the aromatic carbonate, the method comprising...
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6423863 |
Method of sustaining catalyst activity in the catalytic production of aromatic carbonates
The present invention is directed to a method for sustaining the catalytic activity of a carbonylation catalyst composition, after changes in reactor pressure and temperature, in the catalytic...
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6410777 |
Salicylic acid ester derivative and its production
The present invention provides a salicylic acid ester derivative having an impurity content lower than a specific level and expressed by the following formula (1) (in the formula, R 1 is methyl...
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6403821 |
Catalyst composition and method for producing diaryl carbonates using nitrile as promoter
Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIIIB metal, preferably palladium; an alkali metal...
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6380417 |
Catalysts system for producing aromatic carbonates
A method and catalyst system for economically producing aromatic carbonates from aromatic hydroxy compounds. In one embodiment, the present invention provides a method of carbonylating aromatic...
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6355824 |
Catalyst system for producing aromatic carbonates
A method and catalyst system for producing aromatic carbonates from aromatic hydroxy compounds. In one embodiment, the method includes the step of contacting at least one aromatic hydroxy compound...
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6348613 |
Process for producing diaryl carbonate
A process for producing diaryl carbonate of the present invention comprises steps of: (1) a diaryl carbonate production step of subjecting an aromatic monohydroxy compound and phosgene to...
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6323358 |
Catalyst composition for producing aromatic carbonates
A method and catalyst system for producing aromatic carbonates from aromatic hydroxy compounds. In one embodiment, the method includes the step of contacting at least one aromatic hydroxy compound...
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6310232 |
Method for recycle of bromide-containing catalyst constituents
Bromide source such as alkali metal bromide, alkaline earth metal bromide, or onium bromide, present as part of a catalyst mixture in an organic oxidative carbonylation mixture further comprising...
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6310229 |
Lead halophenoxides and carbonylation catalyst and method for preparing and employing them
Lead halophenoxides, especially bromophenoxides, are prepared by the reaction of lead(II) oxides with a hydroxyaromatic compound such as phenol and a chloride or bromide salt such as an alkali...
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6291392 |
Catalysts containing a platinum group metal and produced in a sol-gel method, as well as a method for producing diarylcarbonates
Described is a process for preparing an aromatic carbonate, e.g., diphenyhl carbonate, in which an aromatic hydroxy compound, e.g., phenol, is reacted with carbon monoxide and oxygen in the resence...
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6265340 |
Catalyst composition and method for producing diaryl carbonates
Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIIIB metal, preferably palladium; an alkali metal...
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6242632 |
Supported catalysts containing a platinum group metal and method for producing diarylcarbonates
A platinum metal-containing supported catalyst in which the support contains mixed oxides of metals, transition metals and semiconductor elements, which can act as redox catalysts under the...
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