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Patent Searching and Data


Title:
METHOD FOR PRODUCING TEREPHTHALIC ACID AND TEREPHTHALIC ACID
Document Type and Number:
WIPO Patent Application WO/2005/012218
Kind Code:
A1
Abstract:
A method for producing terephthalic acid wherein an aqueous terephthalic acid solution is purified with a platinum group metal catalyst and then terephthalic acid is crystallized from the resultant aqueous solution, which comprises carrying out the crystallization in an agitating vessel which has, in the bottom portion thereof, an agitating blade being formed in a shape of an approximately trapezoidal plate and being capable of changing a rotating number; and a terephthalic acid product having a narrow particle size distribution. The above method allows the production with good efficiency of terephthalic acid crystals which are excellent in powder characteristics, slurry characteristics and reactivity, and can be controlled with respect to the particle size distribution.

Inventors:
KATO KAZUHIKO (JP)
Application Number:
PCT/JP2004/010576
Publication Date:
February 10, 2005
Filing Date:
July 16, 2004
Export Citation:
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Assignee:
MITSUI CHEMICALS INC (JP)
KATO KAZUHIKO (JP)
International Classes:
C07C51/43; C07C51/487; (IPC1-7): C07C51/43; C07C63/26
Foreign References:
JPH08208561A1996-08-13
JPH08225489A1996-09-03
JPH06329583A1994-11-29
JPH0975699A1997-03-25
JP2002308906A2002-10-23
JPH0975697A1997-03-25
JP2000202268A2000-07-25
JPH11276875A1999-10-12
JP2002306902A2002-10-22
JP2000262880A2000-09-26
JP2003128598A2003-05-08
JP2004202318A2004-07-22
JP2004203864A2004-07-22
JP2004255291A2004-09-16
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