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7622602 |
Method for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates
A method of making a dialkyl carbonate comprises: reacting, in a reactor comprising tantalum, an alkanol, oxygen, and carbon monoxide, in the presence of a catalyst. The reaction occurs in a...
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7605285 |
Method and device for manufacturing dimethyl carbonate
The present invention provides a method and apparatus for producing dimethyl carbonate, wherein carbon dioxide is recovered from combustion exhaust gas of a steam reformer 10 and a boiler; and...
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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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7563919 |
Process for the preparation of an alkanediol and a dialkyl carbonate
An alkanediol and a dialkyl carbonate are prepared in a process comprising:
(a) contacting an alkylene carbonate with an alkanol feedstock under transesterification conditions in a reactive...
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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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7518012 |
Process for the preparation of dialkyl carbonate
The present invention provides a process for the preparation of dialkyl carbonates of general formula (1)
wherein R=alkyl (C 1 -C 8 ) or C 6 H 5 CH 2
the said process comprises a...
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7514521 |
Method for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates
Unexpected corrosion of downstream sections of a dialkyl carbonate manufacturing apparatus has been traced to alkyl chloroformate impurities, which slowly decompose to yield hydrochloric acid. An...
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7504527 |
Low corrosive integrated process for preparing dialkyl carbonates
An integrated process for the production of a dialkyl carbonate and a diol from an alkylene oxide, carbon dioxide and an aliphatic monohydric alcohol is described in which an alkylene oxide is...
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7462336 |
Apparatus for preparing a dialkyl carbonate
An apparatus for preparing a dialkyl carbonate comprises means for reacting an alkanol, oxygen, carbon monoxide, and a catalyst to form a mixture comprising a dialkyl carbonate, an alkyl...
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7453007 |
Process for the production of unsymmetric and/or symmetric dialkyl carbonates and diols
A process for the production of a dialkyl carbonate and a diol, such as dimethyl carbonate and ethylene glycol, by reacting a feed containing a cyclic carbonate, a hydroxy alkyl carbonate and an...
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7385070 |
Method for the catalytic conversion of alkylene carbonate
A method for catalytic conversion of alkylene carbonate, wherein alkylene carbonate is contacted with C 1 -C 5 aliphatic alcohol and/or water in the presence of Mg, Al mixed (hydr) oxide catalyst...
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7351848 |
Method and apparatus for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates
Unexpected corrosion of downstream sections of a dialkyl carbonate manufacturing apparatus has been traced to alkyl chloroformate impurities, which slowly decompose to yield hydrochloric acid. An...
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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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7084292 |
Integrated process for preparing dialkyl carbonates with a circulating catalyst
An integrated process for the production of a dialkyl carbonate and a diol from an alkylene oxide, carbon dioxide and an aliphatic monohydric alcohol is described in which an alkylene oxide is...
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7074951 |
Process for making dialkyl carbonates
A process for the production of dialkyl carbonates from the reaction of alcohol, for example C 1 –C 3 alcohols, with urea is disclosed wherein the water and ammonium carbamates impurities in the...
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7049457 |
Use of an ionic halide free copper catalyst for the production of dialkyl carbonates
A non-corrosive process for the preparation of dialkyl carbonate by reacting carbon monoxide, alkanol and an oxygen-containing gas in the presence of a ionic halogen free copper catalyst.
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6989459 |
In situ process for preparing quaternary ammonium bicarbonates and quaternary ammonium carbonates
Applicant has discovered an in situ method of preparing quaternary ammonium methocarbonate salts and quaternary ammonium alkylcarbonate salts in high yield from tertiary amines, methanol, and at...
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6977308 |
Method and apparatus for preparing a dialkyl carbonate
A method of preparing a dialkyl carbonate includes reacting an alkanol, oxygen, carbon monoxide, and a catalyst to form a mixture that includes a dialkyl carbonate and an alkyl chloroformate. The...
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6897343 |
Process for the preparation of propanediol
The invention relates to a process for the preparation of 1,2-propanediol from propylene oxide, which process involves contacting propylene oxide with carbon dioxide in the presence of a...
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6844287 |
Supported catalysts for the fixation of carbon dioxide into aliphatic polycarbonates and a process for preparing the same
The present invention provides a process for preparing supported zinc dicarboxylate catalysts with high activity for the copolymerization of carbon dioxide and epoxides by supporting zinc...
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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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6768020 |
Method for the catalytic conversion of organic carbonate and the use of a lanthanum catalyst therefor
A method for the catalytic conversion of organic carbonate, wherein organic carbonate is contacted with alcohol and/or water in the presence of a lanthanum catalyst comprising at least about 7 wt....
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6683112 |
Gabapentin prodrugs and formulations
The present invention relates to novel prodrugs of gabapentin and to pharmaceutical formulations and sustained release formulations containing the prodrugs.
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6620958 |
Use of membranes to separate organic liquids having different polarities
A method for separating at least one lower polarity fluid from a mixture of fluids having varying polarity, comprising contacting at least one low polarity or non-polar polymeric membrane with the...
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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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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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6573396 |
Co-production of dialkyl carbonates and diols with treatment of hydroxy alkyl carbonate
A process for the production of a dialkyl carbonate and a diol from a cyclic carbonate and an aliphatic monohydric alcohol wherein the cyclic carbonate and aliphatic monohydric alcohol are reacted...
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6479689 |
Process for continuously producing dialkyl carbonate and diol
A method for continuously producing a dialkyl carbonate and a diol, comprising: (1) continuously feeding a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage...
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6469071 |
Radiation curable acrylate-terminated polymers having polycarbonate repeating units
Polyester based polycarbonate (meth)acrylates prepared by the reaction of a alkylene or arylene diol polycarbonate with an anhydride or its dicarboxylic acid to form a carboxyl terminated diester,...
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6452036 |
Synthesis of dialkyl carbonates
The invention generally concerns methods for the synthesis of dialkyl carbonates, and more specifically dimethyl carbonate (DMC) and diethyl carbonate (DEC). Methods according to the invention...
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6392078 |
Process and catalyst for making dialkyl carbonates
A process for producing dialkyl carbonates, such as dimethyl carbonate, from the reaction of a primary alcohol with urea in the presence of a catalyst which is a complex compound represented by R 2...
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6365767 |
Process for co-production of dialkyl carbonate and alkanediol
A method is provided for co-producing dialkyl carbonate and alkanediol by reacting alkylene carbonate with alkanol in the presence of a zeolite catalyst which contains alkali metal, alkaline earth...
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6359163 |
Process for producing dialkyl carbonate
A process for producing a dialkyl carbonate which comprises performing reaction of allophanate represented by the following general formula (1) and an alkyl alcohol represented by the following...
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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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6346638 |
Process for continuous production of dialkyl carbonate and diol
A method for continuously producing a (A) dialkyl carbonate and a (B) diol, comprising continuously feeding a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage...
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6315868 |
Method of separating dimethyl carbonate and methanol
A method of separating methanol and dimethyl carbonate in a distillation column through extractive distillation. The extractive distillation is conducted in the presence of an extractive...
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RE37337 |
Process for making dialkyl carbonates
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 organotin catalyst complex with a high boiling...
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6207850 |
Process for co-production of dialkyl carbonate and alkanediol
A method is provided for co-producing dialkyl carbonate and alkanediol by reacting alkylene carbonate with alkanol in the presence of a IIIA metal oxide catalyst, preferably alumina.
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6169197 |
Process for separation between dialkyl carbonate and alkyl carbamate
A process for separation between dialkyl carbonate and alkyl carbamate which comprises adding an aromatic hydroxy compound to a liquid comprising alkyl carbamate having an alkyl group having 3 to 6...
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6063952 |
Process for making a tetraaryloxymethane using a cupric alkoxide
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...
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6037298 |
Continuous catalytic process for preparation of organic carbonates
A particularly useful process of contacting a feedstream containing dioxygen, carbon monoxide, ether, and alkanol which can be vaporized under conditions of reaction, with a blend of catalysts...
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6008399 |
Process for preparing organic carbonates
A process for preparing organic carbonates, such as dimethyl carbonate, without the use of phosgene and with a high yield and selectivity to the desired carbonate, by reacting a formaldehyde-acetal...
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5986125 |
Process for the production of dialkyl carbonates
The invention relates to a process for the production of higher dialkyl carbonates corresponding to formula (I): (R 1 O)(R 2 O)CO (I) which R 1 and R 2 may...
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5980445 |
Process for producing diaryl carbonate
A process for producing diaryl carbonate which comprises (A) a step for producing dialkyl carbonate represented by the general formula RO--CO--OR by reacting urea with alkyl alcohol represented by...
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5973184 |
Process for preparing a dialkyl carbonate by gas-phase decarbonylation of dialkyl oxalate
A dialkyl carbonate (e.g., dimethyl carbonate) is prepared at a high yield and a high selectivity by decarbonylation of a dialkyl oxalate (e.g., dimethyl oxalate) in a gaseous phase in the presence...
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5962720 |
Method of synthesizing unsymmetric organic carbonates and preparing nonaqueous electrolytes for alkali ion electrochemical cells
The present invention relates to an improved method of synthesizing unsymmetric linear organic carbonates comprising the reaction of two symmetric dialkyl carbonates, R 1 and R 2 , in the presence...
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5962699 |
Process for decolorizing organic carbonates
A process for decolorizing organic carbonates, for example, cyclic alkylene carbonates, which involves contacting a discolored organic carbonate with hydrogen peroxide, is disclosed.
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5907051 |
Catalyst and method for producing carbonic diesters
A method of producing a carbonic diester involves allowing an alcohol to react with carbon monoxide and oxygen in the presence of a supported catalyst wherein the support is an activated carbon...
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5892091 |
Catalyst for decarbonylation reaction
A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus...
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