PROCESS FOR PRODUCING CARBOXYLIC ACID

WIPO Patent Application WO/2007/088981

A1

Before a crystallization step in which a carboxylic acid is crystallized from a carboxylic-acid-containing liquid in crystallization tanks (12) and (13) each having a cooling surface, a preliminary step is conducted in which at least part of the carboxylic-acid-containing liquid is fed to a cooling device (11) equipped with cooling surfaces (15) and (16) and scraping means (18) and (19) for scraping the cooling surfaces and is cooled from a temperature exceeding the crystallization initiation temperature to a temperature not higher than the crystallization initiation temperature. This process is preferable especially when the carboxylic acid is acrylic acid and/or methacrylic acid.

TANAKA SHIGEHO (JP)
ANDO YOSHIMASA (JP)
SUGIYAMA MIEZI (JP)
SATO HARUKI (JP)

PCT/JP2007/051827

August 09, 2007

February 02, 2007

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MITSUBISHI RAYON CO (JP)
TANAKA SHIGEHO (JP)
ANDO YOSHIMASA (JP)
SUGIYAMA MIEZI (JP)
SATO HARUKI (JP)

C07C51/43; B01D9/02; C07C57/04

WO2002028499A1	2002-04-11
WO2005012218A1	2005-02-10

JPH08208561A	1996-08-13
JPH08225489A	1996-09-03
JPH06329583A	1994-11-29

THE CHEMICAL SOCIETY OF JAPAN, JIKKEN KAGAKU KOZA 1 KIHON SOSA I, DAI 4 HAN, 5 November 1990 (1990-11-05), pages 184 - 186, XP003016176
THE CHEMICAL SOCIETY OF JAPAN, JIKKEN KAGAKU KOZA 2 KIHON SOSA II, DAI 4 HAN, 5 December 1990 (1990-12-05), pages 354 - 358, XP003016177

SHIGA, Masatake et al. (Yaesu Chuo-ku, Tokyo 53, JP)

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