公开(公告)号：US20250091979A1

公开(公告)日：2025-03-20

申请号：US18293259

申请日：2023-05-18

Applicant: LG CHEM, LTD.

Inventor： Byeong Gil LYU ,  Mi Kyung KIM ,  Dae Young SHIN ,  Da Bin JUNG

IPC: C07C51/377 ,  C07C51/46 ,  C07C51/487

Abstract: A method for preparing acrylic acid, the method including: obtaining a reaction product including unreacted lactic acid, water, a light gas component, and acrylic acid by supplying a lactic acid aqueous solution to a reactor to allow a dehydration reaction to proceed; supplying the reaction product to a first cooling tower to separate the reaction product into a lower fraction containing unreacted lactic acid and an upper fraction containing water, a light gas component, and acrylic acid; supplying the upper fraction of the first cooling tower to a second cooling tower to separate a lower fraction containing water and acrylic acid therefrom; and obtaining acrylic acid by purifying the lower fraction of the second cooling tower.

公开(公告)号：US20210316235A1

公开(公告)日：2021-10-14

申请号：US17269178

申请日：2020-07-13

Applicant: LG CHEM, LTD.

Inventor： Sang Ho LEE ,  Dae Young SHIN ,  Sung Woo JEONG ,  Eun Jung JOO

IPC: B01D33/11 ,  B01D33/82 ,  F26B5/08 ,  C08J3/12

Abstract: A pressurizing centrifugal dehydrator for removing moisture includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a pressurization chamber disposed in the outer basket; and a gas supplying portion for supplying gas into the pressurization chamber, wherein the gas supplied to the pressurization chamber is ejected from the pressurization chamber toward a dehydration product positioned between the outer basket and the pressurization chamber.

公开(公告)号：US20170190808A1

公开(公告)日：2017-07-06

申请号：US15313890

申请日：2015-05-28

Applicant: LG CHEM, LTD.

Inventor： Chang Hoe HEO ,  Eun Jung JOO ,  Dae Young SHIN ,  Joon Ho SHIN

IPC: C08F6/00 ,  B01D1/12

CPC classification number: C08F6/003 ,  B01D1/12 ,  C08F6/00 ,  C08L27/06

Abstract: The present application relates to a method for removing an unreacted vinyl chloride monomer (VCM) in polyvinyl chloride (PVC). According to an illustrative stripping apparatus and a stripping method using the stripping apparatus of the present application, in a stripping process using steam, a temperature difference between a raw material including a target substance to be removed and steam is minimized to suppress foam generation in the stripping process, thereby increasing efficiency of removing the target substance to be removed, particularly, an unreacted VCM in PVC. In addition, a cleansing cycle to remove foams generated in the stripping apparatus can be reduced, thereby not only securing economic feasibility of the process, but also preventing degradation in quality of a final product that may occur when an antifoamer to remove the foams is used.

公开(公告)号：US20250084025A1

公开(公告)日：2025-03-13

申请号：US18294056

申请日：2023-05-18

Applicant: LG CHEM, LTD.

Inventor： Byeong Gil LYU ,  Mi Kyung KIM ,  Dae Young SHIN ,  Da Bin JUNG

IPC: C07C51/377 ,  C07C51/46 ,  C07C51/48

Abstract: A method for preparing acrylic acid, the method including: obtaining a reaction product by supplying a lactic acid aqueous solution to a reactor to allow a dehydration reaction to proceed; supplying the reaction product to a first cooling tower to separate the reaction product into a lower fraction containing acrylic acid and lactic acid and an upper fraction containing acrylic acid, water, and a light gas component; 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 an extract containing acrylic acid and an extraction solvent by supplying the lower fraction of the second cooling tower to an extraction column; obtaining a lower fraction containing acrylic acid and lactic acid by supplying the lower fraction of the first cooling tower and the extract to an azeotropic distillation column; and obtaining acrylic acid by supplying the lower fraction of the azeotropic distillation column to an acrylic acid recovery tower.

公开(公告)号：US20200094164A1

公开(公告)日：2020-03-26

申请号：US16495535

申请日：2018-08-30

Applicant: LG CHEM, LTD.

Inventor： Sung Keun JANG ,  Dae Young SHIN ,  Chang Hoe HEO ,  Seung Won CHOI ,  Eun Jung JOO

IPC: B01D11/04 ,  C07C29/80 ,  B01J3/00

Abstract: A separation method and a separation apparatus for a solvent extracted by supercritical extraction. The separation method increases a solvent recovery rate by minimizing the amount of a solvent to be evaporated and lost since the pressure of a solvent is reduced by arranging two or more separators in series. The method includes: introducing a fluid having passed through a supercritical extractor into a first flash vessel; introducing the fluid which has passed through the first flash vessel into a second flash vessel; and discharging and recovering the carbon dioxide and the solvent which have passed through the second flash vessel, respectively. The pressure of the first flash vessel is 40-100 bar, and the pressure of the second flash vessel is 1-30 bar. The fluid includes carbon dioxide and a solvent.

公开(公告)号：US20230331885A1

公开(公告)日：2023-10-19

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 ,  C08F6/00 ,  C08F6/12 ,  B01D53/00

CPC classification number: C08F212/10 ,  C08F6/003 ,  C08F6/12 ,  B01D53/002 ,  B01D2257/708

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：US20220089469A1

公开(公告)日：2022-03-24

申请号：US17420339

申请日：2020-06-09

Applicant: LG CHEM, LTD

Inventor： Sung Woo JEONG ,  In Yong JEONG ,  Sang Ho LEE ,  Eun Jung JOO ,  Dae Young SHIN

IPC: C02F11/127 ,  B01D53/26

Abstract: A centrifugal dehydrator according to an embodiment of the present disclosure for solving the above problems includes: a slurry flow tube through which slurry, in which polymers and water are mixed, flows; a gas flow tube through which a gas flows; a mixture flow tube which is connected from the slurry flow tube and the gas flow tube and through which a mixture of the slurry and the gas flows; a basket into which the mixture is injected from the mixture flow tube and which rotates to apply centrifugal force to the slurry in the mixture; a driving part that allows the basket to rotate; and a porous plate disposed on a peripheral portion of the basket to discharge the water from the slurry to the outside of the basket.

公开(公告)号：US20250145510A1

公开(公告)日：2025-05-08

申请号：US19014017

申请日：2025-01-08

Applicant: LG CHEM, LTD.

Inventor： Sung Woo JEONG ,  In Yong JEONG ,  Sang Ho LEE ,  Eun Jung JOO ,  Dae Young SHIN

IPC: C02F11/127 ,  B01D53/26

Abstract: A centrifugal dehydrator according to an embodiment of the present disclosure for solving the above problems includes: a slurry flow tube through which slurry, in which polymers and water are mixed, flows; a gas flow tube through which a gas flows; a mixture flow tube which is connected from the slurry flow tube and the gas flow tube and through which a mixture of the slurry and the gas flows; a basket into which the mixture is injected from the mixture flow tube and which rotates to apply centrifugal force to the slurry in the mixture; a driving part that allows the basket to rotate; and a porous plate disposed on a peripheral portion of the basket to discharge the water from the slurry to the outside of the basket.

公开(公告)号：US20220282011A1

公开(公告)日：2022-09-08

申请号：US17632232

申请日：2021-07-01

Applicant: LG CHEM, LTD.

Inventor： Dae Young SHIN ,  Jeong A HWANG ,  Eun Jung JOO

IPC: C08F212/10 ,  C08F220/44 ,  B01D19/00 ,  B01D3/14 ,  B01D5/00 ,  B01D53/00

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 reaction product; supplying a reactor discharge stream to a separation device, separating a gaseous stream including an inert gas in the separation device, and supplying a liquid stream including the reaction product from which the inert gas is removed to a volatilization device; separating a polymer from a lower discharge stream from the volatilization device and supplying an upper discharge stream including an unreacted monomer, a solvent, and an inert gas to a condensation unit; and condensing and separating the unreacted monomer and the solvent in the condensation unit and supplying a gaseous stream to a vacuum unit.

公开(公告)号：US20220016646A1

公开(公告)日：2022-01-20

申请号：US17269203

申请日：2020-07-13

Applicant: LG CHEM, LTD.

Inventor： Sang Ho LEE ,  Dae Young SHIN ,  Sung Woo JEONG ,  Eun Jung JOO

IPC: B04B3/02 ,  B04B7/12 ,  B04B15/12 ,  B04B11/02 ,  F26B5/08

Abstract: A pressurizing centrifugal dehydrator for removing moisture according to the present disclosure includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a blocking barrier disposed in the outer basket; and a gas supplying portion for supplying gas into the inner basket and/or the outer basket, wherein a dehydration product is positioned between an outer circumference of the blocking barrier and an inner side of the outer basket to maintain airtightness of the outer basket.