Title:
METHOD OF CENTRIFUGAL SEPARATION OF SLURRY CONTAINING AROMATIC CARBOXYLIC ACID
Document Type and Number:
WIPO Patent Application WO/2004/063139
Kind Code:
A1
Abstract:
A method for conducting a solid-liquid separation of a slurry using a centrifuge in an aromatic carboxylic acid production process, which comprises feeding a slurry containing terephthalic acid and acetic acid as a solvent to a final crystallizing vessel (1) through a flash valve (2) and carrying out crystallization in a state of boiling under reduced pressure to thereby flash-vaporize the solvent and precipitate crystals of terephthalic acid, and operating a centrifuge (4) under atmospheric pressure in the subsequent solid-liquid separation to recover the crystals of terephthalic acid. The method employs an operating pressure for the centrifugal separation step higher than that for the final crystallizing vessel (1), which results in the less susceptibility of the separation section to deposition of crystals, leading to the operation of the centrifuge with good stability and to the production of high purity aromatic carboxylic acid with good efficiency.
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Inventors:
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OGI HIRONORI (IN)
OGATA TOMOHIKO (JP)
FUKUI KATSUHIKO (JP)
OGI HIRONORI (IN)
OGATA TOMOHIKO (JP)
Application Number:
PCT/JP2003/016467
Publication Date:
July 29, 2004
Filing Date:
December 22, 2003
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OGI HIRONORI (IN)
OGATA TOMOHIKO (JP)
NISHIO MASARU (IN)
FUKUI KATSUHIKO (JP)
OGI HIRONORI (IN)
OGATA TOMOHIKO (JP)
International Classes:
C07C51/43; (IPC1-7): C07C51/47; C07C63/26
Domestic Patent References:
| WO1993024440A1 | 1993-12-09 |
Foreign References:
| JP2002336687A | 2002-11-26 | |||
| JP2002326001A | 2002-11-12 |
Attorney, Agent or Firm:
Oguri, Shohei (13th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)
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