发明名称 |
Process for preparing alkanediol and dialkyl carbonate |
摘要 |
The invention relates to a process for the preparation of an alkanediol and a dialkyl carbonate comprising:
reacting an alkylene carbonate and an alkanol in the presence of a transesterification catalyst to obtain a reaction mixture comprising dialkyl carbonate, unconverted alkanol, alkanediol, unconverted alkylene carbonate and an alkoxy alkanol impurity; andsubjecting the reaction mixture to distillation in a series of steps. |
申请公布号 |
US8975432(B2) |
申请公布日期 |
2015.03.10 |
申请号 |
US201013509648 |
申请日期 |
2010.11.15 |
申请人 |
Shell Oil Company |
发明人 |
Allais Cyrille Paul;Nisbet Timothy Michael;Vaporciyan Garo Garbis;Vrouwenvelder Cornelis Leonardus Maria |
分类号 |
C07C68/06;C07C29/48 |
主分类号 |
C07C68/06 |
代理机构 |
|
代理人 |
|
主权项 |
1. A process for the preparation of an alkanediol and a dialkyl carbonate comprising:
(a) reacting an alkylene carbonate and an alkanol in the presence of a transesterification catalyst to obtain a reaction mixture comprising dialkyl carbonate, unconverted alkanol, alkanediol, unconverted alkylene carbonate and an alkoxy alkanol impurity; (b) subjecting the reaction mixture to distillation in a first distillation column to obtain a top stream comprising dialkyl carbonate, alkanol and alkoxy alkanol impurity and a bottom stream comprising alkanediol and alkylene carbonate; (c) subjecting the bottom stream from the first distillation column to distillation in a second distillation column to obtain a top stream comprising alkanediol and a bottom stream comprising alkylene carbonate; (d) subjecting the top stream from the first distillation column to distillation in a third distillation column in the presence of a catalyst to effect reaction of the alkoxy alkanol impurity with the dialkyl carbonate into a carbonate ether impurity, to obtain a top stream comprising alkanol and a bottom stream comprising dialkyl carbonate and carbonate ether impurity; and (e) subjecting the bottom stream from the third distillation column to distillation in a fourth distillation column to obtain a top stream comprising dialkyl carbonate and a bottom stream comprising dialkyl carbonate and carbonate ether impurity; and (f) recycling the bottom stream from the fourth distillation column to the first distillation column. |
地址 |
Houston TX US |