Title:
【発明の名称】精製テレフタル酸の製造方法
Document Type and Number:
Japanese Patent JPH07507292
Kind Code:
A
Abstract:
A process for the production of purified terephthalic acid (PTA) from crude terephthalic acid (CTA) comprising mixing the CTA with an aqueous medium to form an aqueous CTA mixture, heating the mixture to dissolve substantially all of the CTA in the aqueous medium by introducing into the aqueous mixture vapour having a temperature greater than that of said mixture and then chemically reducing impurities in the aqueous solution of CTA followed by recovery of PTA by a crystallisation process. The vapour is typically steam derived from the crystallisation process and may be introduced into the aqueous CTA mixture by means of an injection device (30) (Figures 2 and 3).
Inventors:
Turner, Jiyoung, Arthur
Hind Marshall, Eritsk
Hoodie, David
Milne, Iron, Peter
Hind Marshall, Eritsk
Hoodie, David
Milne, Iron, Peter
Application Number:
JP50029394A
Publication Date:
August 10, 1995
Filing Date:
May 20, 1993
Export Citation:
Assignee:
IMPERIAL CHEMICAL INDUSTRIES PLC
International Classes:
B01D9/02; C07C51/43; C07C51/487; C07C63/26; F28C3/06; (IPC1-7): C07C63/26; B01D9/02; C07C51/43; F28C3/06
Attorney, Agent or Firm:
Shigeru Yagita (2 outside)