Title:
テレフタル酸またはイソフタル酸中のカルボキシベンズアルデヒドの減少方法
Document Type and Number:
Japanese Patent JP4704561
Kind Code:
B2
Abstract:
A method for reducing carboxybenzaldehyde isomers in crude terephthalic and/or isophthalic acids is described. Crude TPA or IPA is dissolved in N-methyl pyrrolidone and is subsequently contacted with an oxidant, such as substantially anhydrous hydrogen peroxide, to convert the carboxybenzaldehyde isomer (4-CBA or 3-CBA) to TPA or IPA under moderate temperature and pressure conditions.
Inventors:
Ramsing, Wyston
Lee, Who-Min
Wight Charlie, Randy, Light
Lee, Who-Min
Wight Charlie, Randy, Light
Application Number:
JP2000554681A
Publication Date:
June 15, 2011
Filing Date:
May 18, 1999
Export Citation:
Assignee:
GTC Technology LP
International Classes:
C07C51/43; C07C51/235; C07C51/42; C07C63/24; C07C63/26; C07C
Foreign References:
| US2949483 | ||||
| GB849189A |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Katsunori Ando
Yukihiro Ikeda
Hajime Asamura
Katsunori Ando
Yukihiro Ikeda