公开(公告)号：US11512153B2

公开(公告)日：2022-11-29

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 ,  C08F2/01 ,  C08F212/10

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：US12215176B2

公开(公告)日：2025-02-04

申请号：US17627568

申请日：2021-07-01

Applicant: LG CHEM, LTD.

Inventor： Jeong A Hwang ,  Dae Young Shin ,  Eun Jung Joo

IPC: C08F212/10 ,  B01D53/00 ,  C08F6/00 ,  C08F6/12

Abstract: Provided is a method of preparing a polymer including: supplying a monomer stream and a solvent stream to a reactor and performing a polymerization reaction to prepare a reaction product; supplying a reactor discharge stream to a volatilization device, separating a polymer from a lower portion of the volatilization device, splitting an upper discharge stream including an unreacted monomer, a solvent, and an inert gas into two or more streams, and divisionally supplying the split streams to a plurality of condensers, respectively; condensing and separating the unreacted monomer and the solvent in each of the condensers and supplying a gaseous stream therefrom to a condenser installed at a rear end of each condenser; and supplying a gaseous stream discharged from a condenser installed at the rearmost end to a vacuum unit.

公开(公告)号：US11267906B2

公开(公告)日：2022-03-08

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 ,  B01J19/26 ,  C08F212/10

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.