Process for producing (meth)acrylic acid

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

2007-03-13

2007-03-13

Page, Thurman K. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S523000

Reexamination Certificate

active

10864498

ABSTRACT:
Clogging of a distillation column by polymerization caused by a change of the production rate of (meth)acrylic acid, is prevented to carry out a stabilized operation over a long period. A process for producing (meth)acrylic acid, which includes a purification step wherein a (meth)acrylic acid-containing material to be purified is supplied to and distilled by a distillation column, wherein during a cut operation in which the production rate of (meth)acrylic acid is reduced by α% relative to the production rate of (meth)acrylic acid during the ordinary operation, the liquid/gas flow rate in the distillation column is adjusted to be at least (100−α/2)% of the liquid/gas flow rate during the ordinary operation.

REFERENCES:
patent: 6448438 (2002-09-01), Yada et al.
patent: 6500982 (2002-12-01), Hale et al.
patent: 2004/0225152 (2004-11-01), Yada et al.
patent: 1287113 (2001-03-01), None
patent: 1065197 (2001-01-01), None
patent: 8-134016 (1996-05-01), None
patent: 2001-340701 (2001-12-01), None
Bennett et al., Chemical Engineering Progress vol. 96, Iss. 5; May 2000, pp. 19-34.
U.S. Appl. No. 11/434,067, filed May 16, 2006, Yada et al.

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