METHOD FOR PREPARING ACRYLIC ACID

WIPO Patent Application WO/2024/058340

A1

The present invention provides a method for preparing acrylic acid, comprising the steps of: obtaining a reaction product including lactic acid, water, light gas components, and acrylic acid, by supplying a lactic acid aqueous solution to a reactor to undergo a dehydration reaction; separating into a lower fraction containing acrylic acid and lactic acid and an upper fraction containing acrylic acid, water, and light gas components, by supplying the reaction product to a first cooling tower; obtaining a lower fraction containing acrylic acid and water, by supplying the upper fraction of the first cooling tower to a second cooling tower; obtaining a liquid extraction containing acrylic acid and an extraction solvent, by supplying the lower fraction of the second cooling tower to an extraction tower; obtaining a lower fraction containing acrylic acid and lactic acid, by supplying the lower fraction of the first cooling tower and the liquid extraction to an azeotropic distillation tower; and obtaining acrylic acid by supplying the lower fraction of the azeotropic distillation tower to an acrylic acid recovery tower.

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WO/2001/097941	AZEOTROPIC DISTILLATION METHOD
JP2016526027	Process of separating formic acid from methyltetrahydrofuran

LYU BYEONG GIL (KR)
KIM MI KYUNG (KR)
SHIN DAE YOUNG (KR)
JUNG DA BIN (KR)

PCT/KR2023/006789

March 21, 2024

May 18, 2023

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LG CHEMICAL LTD (KR)

C07C51/46; C07C51/487; C07C57/04

JP2014189510A	2014-10-06
KR20160122749A	2016-10-24
JP2009242285A	2009-10-22
KR20170113177A	2017-10-12
KR20220078233A	2022-06-10

P&P PATENT LAW FIRM (KR)

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