C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/43 (2006.01) C07C 63/24 (2006.01) C07C 63/26 (2006.01)
Patent
CA 2333706
A method and apparatus for preparing purified terephthalic acid and, optionally, isophthalic acid from mixed xylenes. The method of the present invention purifies the oxidation reactor effluent containing a mixture of terephthalic acid and isophthalic acid as well as minor amounts of 4- carboxybenzaldehyde (4-CBA), 3-carboxybenzaldehyde (3-CBA), and toluic acid isomers, to produce purified terephthalic acid and, optionally purified isophthalic acid in an integrated process.
L'invention se rapporte à un procédé et à un appareil de préparation d'acide téréphtalique et, éventuellement, d'acide isophtalique purifiés à partir de mélanges de xylènes. Ledit procédé consiste à purifier l'effluent du réacteur d'oxydation, qui contient un mélange d'acide téréphtalique et d'acide isophtalique ainsi que de faibles quantités de 4-carboxybenzaldéhyde (4-CBA), de 3-carboxybenzaldéhyde (3-CBA) et d'isomères de l'acide toluique, de manière à produire de l'acide téréphtalique purifié et, éventuellement, de l'acide isophtalique purifié, au cours d'un processus intégré.
Lamshing Wiston
Lee Fu-Ming
Wytcherley Randi Wright
Gtc Technology Inc.
Hfm International Inc.
Kirby Eades Gale Baker
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