US 12,441,676 B2
Process for preparing acrylic acid
Hyebin Kim, Daejeon (KR); Mi Kyung Kim, Daejeon (KR); Eunkyo Kim, Daejeon (KR); and Joon Ho Shin, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/923,885
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Oct. 27, 2021, PCT No. PCT/KR2021/015168
§ 371(c)(1), (2) Date Nov. 7, 2022,
PCT Pub. No. WO2022/119125, PCT Pub. Date Jun. 9, 2022.
Claims priority of application No. 10-2020-0167623 (KR), filed on Dec. 3, 2020.
Prior Publication US 2023/0271914 A1, Aug. 31, 2023
Int. Cl. C07C 57/04 (2006.01)
CPC C07C 57/04 (2013.01) 14 Claims
 
1. A process for producing acrylic acid, the process comprising:
(1) separating a first low-boiling-point material including acetaldehyde (ACHO) and a first high-boiling-point material including acrylic acid (AA) by cooling a reaction product of a bio-raw material;
(2) separating a condensed second low-boiling-point material including acetaldehyde (ACHO) and a second high-boiling-point material including acrylic acid (AA) by compressing the first low-boiling-point material including acetaldehyde (ACHO);
(3) separating a first incompressible material and a third low-boiling-point material including acetaldehyde (ACHO) by adding a second absorbent to the condensed second low-boiling-point material including acetaldehyde (ACHO) and cooling thereof; and
(4) purifying the first high-boiling-point material including acrylic acid (AA) to obtain acrylic acid.