文献类型：专利

英文题名：Co-production of dialkyl carbonate, e.g. dimethyl carbonate, and dialkyl oxalate, e.g. dimethyloxalate, by feeding blended gaseous phases to rectifying tower, and feeding liquid phase

作者：ZHANG B;LIU G;LUO N;JI Y;MAO Y;LI W

机构：[1]UNIV EAST CHINA SCI&TECHNOLOGY;[2]UNIV EAST CHINA SCI & TECHNOLOGY;[3]SHANGHAI PUJING CHEM TECHNOLOGY CO LTD

申请号：CN101830806-A

申请日：2010-05-21

公开日：2010-09-15

语种：英文

收录：DERWENT

摘要：NOVELTY - Co-production of 1-3C dialkyl carbonate and 1-3C dialkyl oxalate comprises dividing a product from a 1-3C dialkyl carbonate synthesis reactor to a first liquid phase and a first gaseous phase; dividing a product from a 1-3C dialkyl oxalate synthesis reactor to a second liquid phase and a second gaseous phase; feeding blended gaseous phases to the first rectifying tower, and feeding the second liquid phase; dividing the tower top fraction generated in the first rectifying tower to a third liquid phase and a third gaseous phase; and feeding the third liquid phase. USE - Method for the co-production of 1-3C dialkyl carbonate, preferably dimethyl carbonate, and 1-3C dialkyl oxalate, preferably dimethyloxalate (claimed). ADVANTAGE - The method reduces energy demands, and is inexpensive. DETAILED DESCRIPTION - Co-production of 1-3C dialkyl carbonate and 1-3C dialkyl oxalate comprises: (A) dividing a product from a 1-3C dialkyl carbonate synthesis reactor to a first liquid phase and a first gaseous phase; (B) dividing a product from a 1-3C dialkyl oxalate synthesis reactor to a second liquid phase and a second gaseous phase; (C) feeding the first liquid phase to a first rectifying tower from a tower top portion, feeding blended first and second gaseous phases to the first rectifying tower from a middle lower portion of the tower, and feeding the second liquid phase to the first rectifying tower from a tower bottom portion, where during rectification, pure 1-3C dialkyl oxalate fraction is produced from the bottom of the first rectifying tower; (D) dividing the tower top fraction generated in the first rectifying tower to a third liquid phase and a third gaseous phase; and (E) feeding the third liquid phase to a second rectifying tower from the tower middle portion to generate pure 1-3C dialkyl carbonate at the bottom of the second rectifying tower. An INDEPENDENT CLAIM is included for a device for the co-production of 1-3C dialkyl carbonate and 1-3C dialkyl oxalate.