Title:
廃水の清浄化方法
Document Type and Number:
Japanese Patent JP4638415
Kind Code:
B2
Abstract:
The present invention provides a method for treating water containing phenolic material such as bisphenol A, phenol, para tertiary butyl phenol, and 1,1,1-tris(hydroxyphenyl)ethane, as well as water soluble polycarbonate oligomers, and dispersed polycarbonate particles by extracting the phenolic material from the water using a water immiscible organic liquid containing an amine coupling catalyst. The treated water is then steam stripped to remove residual organic liquid and the amine. The organic liquid, containing the bisphenol A, phenol, para tertiary butyl phenol, and 1,1,1-tris(hydroxyphenyl)ethane, as well as water soluble polycarbonate oligomers and dissolved polycarbonate particles can be fed back to the coupling step of the polycarbonate process without further regeneration or treatment.
Inventors:
Yuptner, Gunter Ah.
Application Number:
JP2006508620A
Publication Date:
February 23, 2011
Filing Date:
January 21, 2004
Export Citation:
Assignee:
Dow Global Technologies Incorporated
International Classes:
C02F1/20; B01D11/04; B01D19/00; C02F1/26; C08G64/24; C02F9/00
Domestic Patent References:
| JP3292341A | ||||
| JP2000136262A |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Masaya Nishiyama
Takashi Ishida
Tetsuji Koga
Masaya Nishiyama