Patent application number | Description | Published |
20080293960 | Process For The Preparation Of Diaryl Carbonates Or Arylalkyl Carbonates From Dialkyl Carbonates - The invention provides a process for the preparation of diaryl carbonates and/or alkylaryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using one or more intermediate condensers for improving heat integration. | 11-27-2008 |
20090076293 | PROCESSES FOR PREPARING DIARYL AND/OR ALKYLARYL CARBONATES FROM DIALKYL CARBONATES - Processes comprising: reacting a dialkyl carbonate and an aromatic hydroxy compound in the presence of a transesterification catalyst in a first reaction column, the first reaction column comprising a top section, a bottom section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; feeding a bottom product from the first reaction column to a further reaction column; the bottom product comprising a diaryl carbonate, an alkylaryl carbonate, or both, and residual unreacted dialkyl carbonate and aromatic hydroxy compound; the further reaction column comprising a top section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; and reacting the residual reacted dialkyl carbonate and aromatic hydroxy compound in the further reaction column; feeding a process stream to a distillation column, the process stream comprising a mixture of unreacted dialkyl carbonate and one or more reaction-product alcohols drawn from the first reaction column, the further reaction column, or both, such that the unreacted dialkyl carbonate is separated from the one or more reaction-product alcohols; and recycling the separated, unreacted dialkyl carbonate to the first reaction column; wherein the further reaction column comprises one or more condensers, and heat of condensation from the one or more condensers is fed back into the process. | 03-19-2009 |
20090137832 | PROCESSES FOR PURIFYING DIARYL CARBONATES - Processes comprising: transesterifying a dialkyl carbonate and an aromatic hydroxyl compound in the presence of a transesterification catalyst to provide a diaryl carbonate product comprising the transesterification catalyst as an impurity; subjecting the diaryl carbonate product to distillation in a first distillation column having an upper part and a lower part, wherein the upper part comprises a rectifying section and the lower part comprises a stripping section; and withdrawing a first sidestream from the first distillation column, wherein the first sidestream comprises a purified diaryl carbonate. | 05-28-2009 |
20090173636 | PROCESS FOR PRODUCTION OF DIARYL CARBONATE - The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate. | 07-09-2009 |
20090215977 | PROCESS FOR THE PREPARATION OF POLYCARBONATE - The invention relates to a combined process for the preparation of polycarbonate by the phase boundary process and downstream electrolysis of sodium chloride-containing process wastewater. | 08-27-2009 |
20100010252 | PROCESS FOR PREPARING DIARYL CARBONATES FROM DIALKYL CARBONATES - The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns. | 01-14-2010 |
20100261928 | PROCESS FOR PREPARING DIARYL CARBONATES OR ALKYL ARYL CARBONATES FROM DIALKYL CARBONATES - The invention relates to a process for preparing diaryl carbonates and/or alkyl aryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using a reactive dividing wall column. | 10-14-2010 |
20100286431 | PROCESS FOR PREPARING DIARYL CARBONATE - A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described. | 11-11-2010 |
20100324256 | PROCESS FOR PRODUCING POLYCARBONATE - A process is described for producing polycarbonate and utilizing at least some of the process waste water by concentrating the sodium chloride-containing waste water phases for the electrolysis using osmotic membrane distillation, if appropriate with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the polycarbonate production process. | 12-23-2010 |
20110009592 | PROCESS FOR THE PREPARATION OF POLYCARBONATE - A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate. | 01-13-2011 |
20110147229 | PROCESS FOR PRODUCTION OF DIARYL CARBONATE - The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate. | 06-23-2011 |
20110160381 | METHOD FOR EXTRUDING PLASTIC MASSES - The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends. | 06-30-2011 |
20110184089 | METHOD FOR THE EXTRUSION OF PLASTIC MATERIALS - The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries. | 07-28-2011 |
20110233818 | METHOD FOR EXTRUDING PLASTIC MATERIALS - The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries. | 09-29-2011 |
20120068115 | HIGH MOLECULAR WEIGHT, RANDOM, BISPHENOL BASED COPOLY(PHOSPHONATE CARBONATE)S - Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art. | 03-22-2012 |
20120101247 | PROCESS FOR PREPARING DIARYL CARBONATES FROM DIALKYL CARBONATES - The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process). | 04-26-2012 |
20120157653 | ULTRA-HIGH PURITY POLYCARBONATES HAVING GOOD INHERENT COLOR AND THERMAL RESISTANCE AND A DEVICE AND A METHOD FOR PRODUCING THE SAME - The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones. | 06-21-2012 |
20130018186 | BIMETALLIC COMPLEXES AND THE USE THEREOF IN PRODUCING DIARYL CARBONATEAANM Gurtler; ChristophAACI KolnAACO DEAAGP Gurtler; Christoph Koln DEAANM Muller; Thomas ErnstAACI MunchenAACO DEAAGP Muller; Thomas Ernst Munchen DEAANM Ooms; PieterAACI KrefeldAACO DEAAGP Ooms; Pieter Krefeld DEAANM Rechner; JohannAACI KempenAACO DEAAGP Rechner; Johann Kempen DEAANM Risse; FriedhelmAACI KolnAACO DEAAGP Risse; Friedhelm Koln DEAANM Prokofieva; AngelinaAACI LeverkusenAACO DEAAGP Prokofieva; Angelina Leverkusen DEAANM Doro; FrancoAACI AachenAACO DEAAGP Doro; Franco Aachen DEAANM Kohler; BurkhardAACI ZierenbergAACO DEAAGP Kohler; Burkhard Zierenberg DEAANM Leitner; WalterAACI AachenAACO DEAAGP Leitner; Walter Aachen DEAANM Wolf; AurelAACI WulfrathAACO DEAAGP Wolf; Aurel Wulfrath DE - The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts. | 01-17-2013 |
20130072631 | METHOD FOR SEPARATING AN ORGANIC PHASE FROM AN ELECTROLYTE-CONTAINING AQUEOUS AND ORGANIC PHASE - A method for separating electrolyte-containing water from an organic phase by means of permeation on a hydrophobic separating means. The permeated organic solution is substantially depleted in water and the retained water is enriched with electrolytes. | 03-21-2013 |
20130158147 | HIGH MOLECULAR WEIGHT, RANDOM, BISPHENOL BASED COPOLY(PHOSPHONATE CARBONATE)S - Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art. | 06-20-2013 |