Patent RU-2528048-C2 (RU)
Inventor: RIU DZ JONG
IPC: C07C27/02
Filed: 2010-07-16
Granted: 2014-09-10
Abstract: FIELD: chemistry. 
     SUBSTANCE: method of obtaining diphenylcarbonate includes a reaction of carbon dioxide and epoxide in the first reaction zone with the formation of the first reaction product, which includes cyclic carbonate; reetherification of cyclic carbonate with ethanol in the presence of a catalyst of the first reetherification in the second reaction zone with the formation of the second reaction product, which includes diethylcarbonate and glycol; separation of the second reaction product with the extraction of the first fraction of diethylcarbonate and the first fraction of glycol; reetherification of, at least, a part of the first fraction of diethylcarbonate with arylhydroxycompound in the presence of a catalyst of the second reetherification in the third reaction zone with the formation of the third reaction product, which includes ethylarylcarbonate and ethanol; separation of the third reaction product with the extraction of ethylarylcarbonate fraction and the first fraction of ethanol; disproportioning of, at least, a part of ethylarylcarbonate fraction in the presence of a catalyst of disproportioning in the fourth reaction zone with the formation of the fourth reaction product, which includes diarylcarbonate and diethylcarbonate; separation of the fourth reaction product with the extraction of diarylcarbonate fraction and the second diethylcarbonate fraction; recirculation of, at least, a part of the first ethanol fraction into the second reaction zone and recirculation of, at least, a part of the second diethylcarbonate fraction into the third reaction zone. Or a method of diarylcarbonate obtaining includes a reaction of ammonia and carbon dioxide in the first reaction zone with the formation of the first reaction product, which includes urea; reetherification of urea with ethanol in the presence of a catalyst of the first reetherification in the second reaction zone with the formation of the second reaction product, which includes diethylcarbonate and ammonia; separation of the second reaction product with the extraction of the first fraction of diethylcarbonate and the first fraction of ammonia; reethrification of, at least, a part of the first fraction of diethylcarbonate with arylhydroxycompound in the presence of a catalyst of the second reetherification in the third reaction zone with the formation of the third reaction product, which includes ethylarylcarbonate and ethanol; separation of the third reaction product with the extraction of the ethylarylcarbonate fraction and ethanol fraction; disproportioning of, at least, part of the ethylarylcarbonate fraction in the presence of a catalyst of disproportioning in the fourth reaction zone with the formation of the fourth reaction product, which includes diarylcarbonate and diethylcarbonate; separation of the fourth reaction product with the extraction of the diarylcarbonate fraction and the second fraction of diethylcarbonate; recirculation of, at least, a part of the ethanol fraction into the second reaction zone and recirculation of, at least, a part of the second diethylcarbonate fraction into the third reaction zone. Disclosed methods efficiently combine into one the whole production of diethylcarbonate and diarylcarbonate, eliminating the necessity of extraction distillation with a solvent, which is usually applied in the production of diarylcarbonates from dimethylcabonate, providing a combination of reaction and separation equipment and best use of the raw material and reducing production costs and capital investments for such methods. In some versions of realisation the methods disclosed in the invention can be realised, for instance, with a practically closed cycle for ethanol. 
     EFFECT: invention relates to the methods of obtaining diarylcarbonates, which make it possible to obtain diarylcarbonates from gases, causing the greenhouse effect, such as carbon dioxide. 
     29 cl, 24 dwg, 9 tbl, 18 ex