METHOD FOR PREPARING HIGH-PURITY (METH)ACRYLIC ACID

WIPO Patent Application WO/2024/049105

A1

The present invention provides a method for preparing (meth)acrylic acid, comprising the steps of: making a mixture gas, which contains (meth)acrylic acid, come in contact with water in an absorption column, thereby obtaining a (meth)acrylic acid aqueous solution; supplying the (meth)acrylic acid aqueous solution to a crystallizer, and crystallizing same, thereby obtaining purified (meth)acrylic acid and a mother liquor separated from the purified (meth)acrylic acid; supplying some of the mother liquor to an extraction column, and supplying the rest to a water separation column; making an extraction solvent come in contact with the mother liquor in the extraction column, and then supplying a discharge stream at the top of the extraction column to the water separation column; separating, in the water separation column, a discharge stream, containing water, at the top of the water separation column from a discharge stream, containing (meth)acrylic acid and high-boiling-point by-products, at the bottom of the water separation column; and supplying, to a high-boiling-point by-product separation column, the discharge stream at the bottom of the water separation column, and supplying, to the crystallizer, a discharge stream, containing (meth)acrylic acid, at the top of the high-boiling-point by-product separation column.

YOO SUNG JIN (KR)
JANG KYUNG SOO (KR)
LEE SUNG KYU (KR)

PCT/KR2023/012560

March 07, 2024

August 24, 2023

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LG CHEMICAL LTD (KR)

C07C51/43; C07C51/25; C07C57/04

KR20040108610A	2004-12-24
KR20160030715A	2016-03-21
JP2007182437A	2007-07-19
KR20070077053A	2007-07-25
KR20140060528A	2014-05-20

P&P PATENT LAW FIRM (KR)

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