Title:
カルボン酸ジアリールエステルの連続製造法
Document Type and Number:
Japanese Patent JP4116288
Kind Code:
B2
Abstract:
A two stage interfacial polycondensation process for the production of carbonic acid diaryl ester is disclosed. The invention concerns an improvement to the process that entails forming in a first stage a reaction mixture that contains an inert solvent, at least one monophenol, phosgene, and aqueous alkali hydroxide solution, passing said reaction mixture to a second stage through at least one constriction at a velocity of 3 to 15 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 2.5 bar, and in said second stage passing said mixture through at least one dispersing element at a velocity of 2 to 10 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 0.5 bar. The resulting product is characterized by its purity and suitability for the manufacture of polycarbonates in the melt transesterification process.
Inventors:
Andreas Crizo Leopard
Stefen Curing
Johann van den einde
Stefen Curing
Johann van den einde
Application Number:
JP2001389220A
Publication Date:
July 09, 2008
Filing Date:
December 21, 2001
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
C07C68/02; C07C69/96
Domestic Patent References:
| JP62190146A | ||||
| JP9012511A | ||||
| JP10053564A |
Foreign References:
| WO2000058259A1 |
Attorney, Agent or Firm:
Aoyama Aoi
Muneo Yamamoto
Muneo Yamamoto