Process for producing (meth) acrylic acid compound

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

2007-01-23

2007-01-23

Page, Thurman K. (Department: 1621)

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

Organic compounds

Carboxylic acid esters

C562S600000

Reexamination Certificate

active

10837177

ABSTRACT:
A process for producing a (meth)acrylic acid compound, which comprises distilling acrylic acid, methacrylic acid (these will hereinafter generally be referred to as “(meth)acrylic acid”) or an ester thereof (these will hereinafter generally be referred to as “a (meth)acrylic acid compound”) in a distillation column to obtain a purified (meth)acrylic acid compound, characterized in that in the course of operation of the distillation column including suspension and resumption of the operation, the distillation column is washed with water and, thereafter, inside washing with an organic solvent and/or azeotropic distillation in the presence of the organic solvent is conducted. In some cases, washing with alkaline water may be added prior to the washing with water. Washing of the distillation column for separating and purifying a crude (meth)acrylic acid compound, can be carried out easily. In particular, in a process for producing a (meth)acrylic acid compound, a substance used in a step before or after the distillation column can be utilized to recover a valuable substance, and the distillation column can be efficiently cleaned.

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