US 12,221,412 B2
System and method for producing diester-based composition
Yeon Uk Choo, Daejeon (KR); Sung Kyu Lee, Daejeon (KR); and Jae Hun Jeong, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/613,868
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 10, 2020, PCT No. PCT/KR2020/012231
§ 371(c)(1), (2) Date Nov. 23, 2021,
PCT Pub. No. WO2021/060746, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0118065 (KR), filed on Sep. 25, 2019.
Prior Publication US 2022/0212157 A1, Jul. 7, 2022
Int. Cl. C07C 67/54 (2006.01); B01D 19/00 (2006.01); B01J 19/00 (2006.01); C07C 67/08 (2006.01)
CPC C07C 67/54 (2013.01) [B01D 19/00 (2013.01); B01J 19/0046 (2013.01); C07C 67/08 (2013.01); B01J 2219/00452 (2013.01); B01J 2219/0059 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A system for producing a diester-based composition, the system comprising:
a first reactor in which an esterification reaction of dicarboxylic acid and alcohol is performed;
a first reflux unit connected to the first reactor and selectively separating unreacted alcohol from a mixed gas generated during the esterification reaction, and then refluxing the separated unreacted alcohol to the first reactor, wherein the first reflux unit comprises:
1) a first reflux column directly connected to the first reactor and receiving the mixed gas and unreacted alcohol in a liquid state and then transferring the mixed gas to a first pre-condenser and the unreacted alcohol in a liquid state to the first reactor;
2) the first pre-condenser directly connected to the first reflux column and condensing a portion of the unreacted alcohol in the mixed gas from the first reflux column;
3) a gas-liquid separation device directly connected to the first pre-condenser and receiving the mixed gas and the unreacted alcohol in a liquid state which is condensed from the portion of the unreacted alcohol, and then transferring the mixed gas to a first condenser and the unreacted alcohol in a liquid state to the first reflux column;
4) the first condenser directly connected to the gas-liquid separation device and condensing the mixed gas from the gas-liquid separation device; and
5) a first layer-separator directly connected to the first condenser and separating alcohol and water in a condensate and then transferring an alcohol layer to the gas-liquid separation device and discharging a water layer.