Title:
ジアルキルカーボネートの工業的分離方法
Document Type and Number:
Japanese Patent JP4260212
Kind Code:
B2
Abstract:
It is an object of the present invention to provide a specific apparatus and process for using a single distillation column on a low boiling point reaction mixture containing a large amount of a dialkyl carbonate and an aliphatic monohydric alcohol produced through a reactive distillation process of taking a cyclic carbonate and the aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a homogeneous catalyst is present, and carrying out reaction and distillation simultaneously in the column, so as to separate the low boiling point reaction mixture by distillation into a column top component B T having the aliphatic monohydric alcohol as a main component thereof and a column bottom component B B having the dialkyl carbonate as a main component thereof stably for a prolonged period of time industrially. Moreover, it is an object to provide such a specific apparatus and process that are inexpensive and enable the dialkyl carbonate to be separated out by distillation in an amount of, for example, not less than 2 ton / hr stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours). It has been discovered that by using a single continuous multi-stage distillation column having a specified structure, from out of a dialkyl carbonate and a diol produced through a reactive distillation system from a cyclic carbonate and an aliphatic monohydric alcohol, a high-purity dialkyl carbonate of purity not less than 97%, preferably not less than 99%, more preferably not less than 99.9%, can be separated out by distillation on an industrial scale of not less than 2 ton / hr, preferably not less than 3 ton / hr, more preferably not less than 4 ton / hr, with a high yield stably for a prolonged period of time of not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours.
Inventors:
Shinichi Fukuoka
Yuki Miyaji
Hiroshi Hachiya
Kazuhiko Matsuzaki
Yuki Miyaji
Hiroshi Hachiya
Kazuhiko Matsuzaki
Application Number:
JP2007551903A
Publication Date:
April 30, 2009
Filing Date:
December 15, 2006
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
C07C68/08; B01D3/14; B01D3/16; C07C68/06; C07C69/96; C07B61/00
Domestic Patent References:
| JP2002371037A | ||||
| JP6228026A | ||||
| JP2000281630A | ||||
| JP7025830A | ||||
| JP9183744A | ||||
| JP2003342209A |
Foreign References:
| WO2000051954A1 | ||||
| WO2005123638A1 | ||||
| WO2006035642A1 | ||||
| WO2006001256A1 | ||||
| WO2007060894A1 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Shinji Oga
Toshifumi Onuki
Shinji Oga
Toshifumi Onuki