PROCESS FOR CONTINUOUS RECOVERING (METH)ACRYLIC ACID AND APPARATUS FOR THE PROCESS (As Amended)

摘要

This disclosure relates to a method for continuous recovery of (meth)acrylic acid and an apparatus used for the recovery method. The method of continuous recovery of (meth)acrylic acid according to the present invention may remarkably reduce the amount of extraction solvent used and energy consumption of the total process, and minimize polymerization of (meth)acrylic acid in the recovery process, thus enabling stable recovery of (meth)acrylic acid and operation of a continuous process.

主权项

1. A method for continuous recovery of (meth)acrylic acid, comprising:
an absorption process wherein a mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is contacted with water to obtain a (meth)acrylic acid aqueous solution; an extraction process wherein the (meth)acrylic acid aqueous solution obtained through the absorption process is contacted with an extraction solvent in an extraction column to obtain a (meth)acrylic acid extract solution and a raffinate solution; and a distillation process wherein a feed including the (meth)acrylic acid extract solution obtained through the extraction process is distilled to obtain (meth)acrylic acid, wherein the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30% from the uppermost part of the (meth)acrylic acid absorption tower, and a weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column is greater than 0.3 and less than 1.0.