公开(公告)号：US20210070895A1

公开(公告)日：2021-03-11

申请号：US16634094

申请日：2019-08-01

Applicant: LG CHEM, LTD.

Inventor： Jeong A HWANG ,  Daeyoung SHIN ,  Sungkeun JANG ,  Eun Jung JOO ,  Won Kyun LEE

IPC: C08F6/00 ,  C08F212/10 ,  C08F2/01

Abstract: The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced.

公开(公告)号：US20190152910A1

公开(公告)日：2019-05-23

申请号：US16091475

申请日：2017-11-06

Applicant: LG CHEM, LTD.

Inventor： Joo Young CHEON ,  Jun Seon CHOI ,  Ji Yeon KIM ,  Wang Rae JOE ,  Kyung Soo KIM ,  Eung Seob YEOM ,  Won Kyun LEE

IPC: C07D207/452 ,  B01J27/16 ,  B01J27/28

Abstract: The present invention relates to a synthesis method of N-substituted maleimides using a non-homogeneous solid acid catalyst, and particularly, a synthesis method of N-substituted maleimides with high synthesis yield by using a zirconium(IV) hydrogen phosphate as a catalyst, by which, the loss of the catalyst is minimized, the separation and recovering processes of the catalyst are simplified, in case when the activity of the separated and recovered catalyst is decreased, the complete regeneration of the catalyst is possible via washing or firing, and solvents that could be used during a washing process of the catalyst are not limited.

公开(公告)号：US20210061928A1

公开(公告)日：2021-03-04

申请号：US16632505

申请日：2019-07-09

Applicant: LG CHEM, LTD.

Inventor： Daeyoung SHIN ,  Jeong A HWANG ,  Eun Jung JOO ,  Won Kyun LEE ,  Sungkeun JANG

IPC: C08F2/01 ,  C08F2/06 ,  C08F212/10 ,  B01J19/26

Abstract: A method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer includes polymerizing a reaction mixture containing an aromatic vinyl compound, a vinyl cyanide compound, and an organic solvent in a reactor and transferring the vaporized reaction mixture present in the upper space of the reactor to a heat exchanger via a pipe and condensing the vaporized reaction mixture. The condensed reaction mixture is transferred to one side of the pipe and sprayed into the pipe, the flow velocity of the reaction mixture vaporized in the reactor is reduced, and temperature is lowered. Accordingly, a phenomenon wherein polymer particles in a reactor are sucked into a heat exchanger is prevented, and occurrence of polymerization in the heat exchanger is suppressed. Therefore, productivity and quality may be improved.