Process for producing (meth) acrylic acid

Details Process for producing (meth) acrylic acid Process for producing (meth) acrylic acid

1997-12-15

1999-02-16

Geist, Gary

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

203DIG21, C07C 5142

Patent

active

058722882

ABSTRACT:
The present invention provides a process for producing (meth)acrylic acid by gas-phase catalytic oxidation, which comprises cooling and condensing a (meth)acrylic acid-containing reaction product gas to obtain a crude aqueous (meth)acrylic acid solution; cooling the aqueous solution to deposit the impurities contained in the aqueous solution, as solid matter; separating the solid matter; and then extracting and separating (meth)acrylic acid from the purified aqueous (meth)acrylic acid solution obtained. Unlike the conventional processes in which (meth)acrylic acid is extracted and separated from a crude aqueous (meth)acrylic acid solution, the present process can avoid various troubles caused by the impurities contained in the crude aqueous (meth)acrylic acid solution, for example, generation of scum and the like, and therefore can produce (meth)acrylic acid at a higher purity than in the conventional processes.

REFERENCES:
patent: 4618709 (1986-10-01), Sada et al.
patent: 4987252 (1991-01-01), Kuragano et al.
Database WPI, Section Ch, Week 9532, Derwent Publications Ltd., London GB Abstract of Jap. Laid-Open Patent Appln. Publ. No. 1-226845 (Sep. 11, 1989).

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