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    PROCESS FOR PRODUCING ACRYLIC ACID
    1.
    发明公开
    PROCESS FOR PRODUCING ACRYLIC ACID 审中-公开

    公开(公告)号：US20230174453A1

    公开(公告)日：2023-06-08

    申请号：US17921693

    申请日：2021-10-27

    申请人： LG CHEM, LTD.

    发明人： Hyebin KIM ,  Mi Kyung KIM ,  Eunkyo KIM ,  Joon Ho SHIN

    IPC分类号： C07C51/47 ,  C07C51/44

    CPC分类号： C07C51/47 ,  C07C51/44

    摘要： Provided is a process for producing acrylic acid, wherein the process comprises a first step and a second step in which a first absorbent is added to a reaction product of a bio-material and cooled to separate a first low-boiling-point material including acetaldehyde (ACHO) and a first high-boiling-point material including acrylic acid (AA). The process is capable of producing high-purity acrylic acid at high yield, and acetaldehyde is produced as by-product along with the reaction product of the bio-material. The process includes separating the acetaldehyde produced as by-product into a high-purity product at high yield.

    METHOD FOR PRODUCING ACRYLIC ACID
    2.
    发明申请
    METHOD FOR PRODUCING ACRYLIC ACID 有权

    公开(公告)号：US20230131529A1

    公开(公告)日：2023-04-27

    申请号：US17920861

    申请日：2021-10-27

    申请人： LG CHEM, LTD.

    发明人： Mi Kyung KIM ,  Hyebin KIM ,  Jaeik LEE ,  Eunkyo KIM

    IPC分类号： C07C51/377 ,  C07C51/44

    摘要： Provided is a method for producing acrylic acid, the method including: preparing a reaction product containing acrylic acid by supplying lactic acid to a reactor and performing a dehydration reaction; supplying a reactor discharge stream containing the reaction product to a cooling tower and condensing the result to transfer a lower discharge stream including a condensate to an acrylic acid purification unit and supplying a non-condensate discharged as an upper discharge stream to a distillation tower; and, in the distillation tower, circulating the lower discharge stream containing acrylic acid to the cooling tower, and removing acetaldehyde from the upper discharge stream.

    METHOD FOR PURIFYING N-SUBSTITUTED MALEIMIDE
    4.
    发明申请
    METHOD FOR PURIFYING N-SUBSTITUTED MALEIMIDE 有权

    公开(公告)号：US20210355083A1

    公开(公告)日：2021-11-18

    申请号：US16336084

    申请日：2018-07-09

    申请人： LG CHEM, LTD.

    发明人： Eun Kyo KIM ,  Jeong Seok LEE ,  Mi Kyung KIM ,  Joo Young CHEON

    IPC分类号： C07D207/444 ,  C08F222/40 ,  C08F2/01

    摘要： The present invention relates to a method for purifying N-substituted maleimide. More particularly, the present invention adopts an evaporation apparatus, which can previously remove impurities having higher boiling points than the N-substituted maleimide after removing an organic solvent from an N-substituted maleimide resulting solution, thereby achieving effects of minimizing the pressure loss and polymerization loss, and obtaining high-purity N-substituted maleimide.

    METHOD FOR PRODUCING BUTADIENE THROUGH OXIDATIVE DEHYDROGENATION REACTION (As Amended)
    6.
    发明申请
    METHOD FOR PRODUCING BUTADIENE THROUGH OXIDATIVE DEHYDROGENATION REACTION (As Amended) 有权
    通过氧化脱氢反应生产丁二烯的方法（如修改）

    公开(公告)号：US20160289145A1

    公开(公告)日：2016-10-06

    申请号：US15034815

    申请日：2015-05-15

    申请人： LG CHEM, LTD.

    发明人： Jae Ik LEE ,  Jeong Seok LEE ,  Mi Kyung KIM ,  Dae Hyeon KIM ,  Jong Ku LEE

    IPC分类号： C07C5/48 ,  C07C7/04 ,  C07C7/00

    CPC分类号： C07C5/48 ,  C07C7/005 ,  C07C7/04 ,  C07C2523/18 ,  C07C2523/28 ,  C07C2523/31 ,  C07C11/167

    摘要： The present invention relates to a method for producing butadiene through an oxidative dehydrogenation reaction. The production method according to the present invention may easily regulate an input ratio between oxygen and nitrogen that are used as raw material, such that a loss may be minimized of butadiene that is included in a second fraction stream (purge stream) and discharged to outside of the system. Consequently, an economic competitiveness of the process, such as a reduced raw material cost and an improved productivity may be realized.

    摘要翻译： 本发明涉及通过氧化脱氢反应生产丁二烯的方法。 根据本发明的制造方法可以容易地调节用作原料的氧和氮之间的输入比例，使得包含在第二级分流（净化流）中并排放到外部的丁二烯的损失可能最小化 的系统。 因此，可以实现过程的经济竞争力，例如降低的原材料成本和提高的生产率。

    PREPARATION METHOD OF POLYALKYLENE CARBONATE
    8.
    发明申请
    PREPARATION METHOD OF POLYALKYLENE CARBONATE 有权

    公开(公告)号：US20210340318A1

    公开(公告)日：2021-11-04

    申请号：US17273650

    申请日：2020-07-07

    申请人： LG CHEM, LTD.

    发明人： Woosung HWANG ,  Dongmin KIM ,  Seung Young PARK ,  Mi Kyung KIM ,  Joon Ho SHIN ,  Wonseok KIM

    IPC分类号： C08G64/34 ,  C08G64/40

    摘要： The present disclosure relates to a method for preparing a polyalkylene carbonate. More specifically, provided is a method for preparing a polyalkylene carbonate in which after polymerization of polyalkylene carbonate, a mixture from which unreacted carbon dioxide and residual catalyst have been removed is charged into a stripper to remove the unreacted epoxide compound, and then heat-exchanged before removing the solvent to increase the temperature of the mixture stream to the maximum level, which is subjected to a heating step, following by a solvent removal step, whereby the amount of steam required in the heating step is reduced, side reactions due to unreacted epoxide compounds are prevented, and steam energy can be reduced in the solvent removal step.

    METHOD FOR PREPARING POLYBUTYLENE TEREPHTHALATE
    9.
    发明申请
    METHOD FOR PREPARING POLYBUTYLENE TEREPHTHALATE 审中-公开

    公开(公告)号：US20190092900A1

    公开(公告)日：2019-03-28

    申请号：US16086286

    申请日：2017-10-19

    申请人： LG CHEM, LTD.

    发明人： Suk Yung OH ,  Soo Hwan HWANG ,  Jeong Seok LEE ,  Mi Kyung KIM

    IPC分类号： C08G63/183 ,  C08G63/78

    摘要： The present disclosure relates to a method for preparing polybutylene terephthalate, and the method for preparing polybutylene terephthalate of the present disclosure recycles the recovered 1,4-butanediol, so the condensation efficiency in the condenser is not lowered. Therefore, the degree of vacuum of the polycondensation reactor is maintained, so that the preparation efficiency and the degree of polymerization of polybutylene terephthalate can be increased.

    METHOD FOR PRODUCING BUTADIENE THROUGH OXIDATIVE DEHYDROGENATION REACTION
    10.
    发明申请
    METHOD FOR PRODUCING BUTADIENE THROUGH OXIDATIVE DEHYDROGENATION REACTION 审中-公开
    通过氧化脱氢反应生产丁二烯的方法

    公开(公告)号：US20160326071A1

    公开(公告)日：2016-11-10

    申请号：US15110666

    申请日：2015-06-09

    申请人： LG CHEM, LTD.

    发明人： Mi Kyung KIM ,  Jeong Seok LEE ,  Jae Ik LEE ,  Dae Hyeon KIM ,  Jong Ku LEE

    IPC分类号： C07C7/11 ,  C07C5/48

    CPC分类号： C07C7/11 ,  C07C5/48 ,  C07C2523/18 ,  C07C2523/28 ,  C07C2523/31 ,  C07C11/167

    摘要： The present invention relates to a method for producing butadiene through an oxidative dehydrogenation reaction, the method including steps of a) introducing a first stream which includes C4 fraction, steam, oxygen (O2), and nitrogen (N2) into a reactor which is filled with catalyst to perform oxidative dehydrogenation reaction; b) selectively absorbing butadiene, which is obtained from the reactor, into an absorption solvent, and separating and removing C4 mixture other than the dutadiene and light gas product; and c) recovering and purifying the butadiene. Through integration of the gas separating and purifying steps by using the single absorption solvent during production of butadiene, equipment costs and operating costs accruing from repeated introduction and removal of solvent are reduced, thereby ensuring economic competitiveness of the process.

    摘要翻译： 本发明涉及通过氧化脱氢反应生产丁二烯的方法，该方法包括以下步骤：a）将包含C4馏分，蒸汽，氧气（O 2）和氮气（N 2）的第一流引入填充的反应器中 用催化剂进行氧化脱氢反应; b）选择性地将从反应器获得的丁二烯吸收到吸收溶剂中，以及除去二丁二烯和轻质气体产物之外的C4混合物; 和c）回收和纯化丁二烯。 通过在丁二烯生产过程中通过使用单一吸收溶剂来整合气体分离和纯化步骤，降低了反复引入和除去溶剂所产生的设备成本和运行成本，从而确保了该方法的经济竞争力。