Title:
METHOD FOR PRODUCING HIGH PURITY TEREPHTHALIC ACID
Document Type and Number:
WIPO Patent Application WO/2004/063136
Kind Code:
A1
Abstract:
A method for producing high purity terephthalic acid, characterized in that it comprises conducting pressure-release and cooling in a crystallizing step in a crystallizing vessel (14) to generate steam (H), subjecting the steam to the heat exchange with a crude terephthalic acid slurry (C) to thereby use the steam (H) as a part of the heat source for heating the crude terephthalic acid slurry (C), and condensing the steam generated in the crystallization step by the above heat exchange into a condensate (I) to use the condensate (I) as a part of an aqueous medium (B). The method allows the effective use of an aqueous medium and the steam generated in a crystallization step in combination with the production of the high purity terephthalic acid having a concentration of p-toluic acid limited to a specific range, and also allows the effective use of a condensate from the steam.
Inventors:
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OOGI HIRONORI (IN)
ISOGAI TAKAYUKI (JP)
INOUE KAORU (JP)
FUKUI KATSUHIKO (JP)
OOGI HIRONORI (IN)
ISOGAI TAKAYUKI (JP)
INOUE KAORU (JP)
Application Number:
PCT/JP2003/016786
Publication Date:
July 29, 2004
Filing Date:
December 25, 2003
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OOGI HIRONORI (IN)
ISOGAI TAKAYUKI (JP)
INOUE KAORU (JP)
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OOGI HIRONORI (IN)
ISOGAI TAKAYUKI (JP)
INOUE KAORU (JP)
International Classes:
C07C51/43; (IPC1-7): C07C51/43; C07C51/265; C07C63/26
Domestic Patent References:
| WO1993024441A1 | 1993-12-09 |
Attorney, Agent or Firm:
Oguri, Shohei (13th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)
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