Title:
高純度ジフェニルカーボネートの工業的製造法
Document Type and Number:
Japanese Patent JP4236205
Kind Code:
B2
Abstract:
It is an object of the present invention to provide a specific process that enables a high-purity diphenyl carbonate that can be used as a raw material of a high-quality and high-performance polycarbonate to be produced stably for a prolonged period of time on an industrial scale of not less than 1 ton / hr from a reaction mixture containing a catalyst and reaction by-products that has been obtained through transesterification reaction and the like using a dialkyl carbonate and a phenol as a starting material. Although there have been various proposals regarding processes for the production of reaction mixtures containing aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures on a specific process or apparatus enabling mass production on an industrial scale from such a reaction mixture to a high-purity diphenyl carbonate that can be used as a raw material of a high-quality and high-performance polycarbonate. According to the present invention, there are provided a high boiling point material separating column A and a diphenyl carbonate purifying column B each comprising a continuous multi-stage distillation column having specified structures, and there is provided a specific process that enables a high-purity diphenyl carbonate which is important as a raw material of a high-quality and high-performance polycarbonate to be produced stably for a prolonged period of time on an industrial scale of not less than 1 ton / hr from a reaction mixture containing the diphenyl carbonate using an apparatus in which these two continuous multi-stage distillation columns are connected together.
Inventors:
Shinichi Fukuoka
Yuki Miyaji
Hiroshi Hachiya
Kazuhiko Matsuzaki
Yuki Miyaji
Hiroshi Hachiya
Kazuhiko Matsuzaki
Application Number:
JP2006532747A
Publication Date:
March 11, 2009
Filing Date:
August 31, 2005
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
C07C68/06; B01D3/14; B01D3/32; C07C68/08; C07C69/96; C07B61/00
Domestic Patent References:
| JP4100824A | ||||
| JP9110805A | ||||
| JP2001064235A | ||||
| JP2004323384A | ||||
| JP2003516376A |
Foreign References:
| WO1991009832A1 | ||||
| WO2006022294A1 | ||||
| WO2006001256A1 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Shinji Oga
Toshifumi Onuki
Shinji Oga
Toshifumi Onuki
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