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    Method for preparing alpha-methylstyrene
    3.
    发明授权
    Method for preparing alpha-methylstyrene 有权

    公开(公告)号：US11858874B2

    公开(公告)日：2024-01-02

    申请号：US17761149

    申请日：2021-08-30

    Applicant: LG CHEM, LTD.

    Inventor： Jaekwon Jeoung ,  Dong Hyun Ko ,  Sunhwan Hwang ,  Jun Han Kang ,  Sang Jin Han

    IPC: C07C1/24 ,  C07C15/46

    CPC classification number: C07C15/46 ,  C07C1/24

    Abstract: A method for preparing alpha-methylstyrene according to one embodiment of the present disclosure includes dehydrating a dimethylbenzyl alcohol solution in a reactor under an acid catalyst to prepare alpha-methylstyrene, where a reaction product after the dehydration reaction comprises a first reaction product including a first alpha-methylstyrene; and a second reaction product including vapor (H2O), a second alpha-methylstyrene and unreacted materials; and separating the second alpha-methylstyrene and the unreacted materials comprised in the second reaction product and recirculating the second alpha-methylstyrene and the unreacted materials to the reactor, a temperature inside the reactor during the dehydration reaction is 135° C. or higher, and a content of the acid catalyst is from 100 ppm to 1,500 ppm based on a total weight of dimethylbenzyl alcohol of the dimethylbenzyl alcohol solution.

    SOCKET-TYPE FLUID DISTRIBUTOR
    4.
    发明申请
    SOCKET-TYPE FLUID DISTRIBUTOR 有权

    公开(公告)号：US20210387152A1

    公开(公告)日：2021-12-16

    申请号：US17274737

    申请日：2020-08-12

    Applicant: LG CHEM, LTD.

    Inventor： Joo Young Cheon ,  Dong Hyun Ko ,  Jun Han Kang ,  Sang Jin Han ,  Hyun Jin Cho ,  Jae Kwon Jeoung

    IPC: B01J8/06

    Abstract: A socket-type fluid distributor for distributing and supplying a gas and/or liquid reactant into a reactor body. The socket-type fluid distributor includes: a distributor body, a bottom portion of which is inserted into the reactor body; a mixing flow path formed in a central portion of the distributor body such that the mixing flow path penetrates through the distributor body into the reactor body; a gas reactant input portion disposed above the distributor body and having a gas flow path; a liquid reactant input portion disposed between the distributor body and the gas reactant input portion and having a liquid flow path; and a flow control portion formed in the mixing flow path.

    Method for producing butadiene
    6.
    发明授权
    Method for producing butadiene 有权

    公开(公告)号：US11447435B2

    公开(公告)日：2022-09-20

    申请号：US17050031

    申请日：2019-07-10

    Applicant: LG CHEM, LTD.

    Inventor： Myungji Suh ,  Jun Han Kang ,  Kyong Yong Cha ,  Dong Hyun Ko

    IPC: C07C5/48 ,  B01J23/31 ,  B01J23/80 ,  B01J37/02 ,  B01J37/03

    Abstract: An exemplary embodiment of the present application provides a method for preparing butadiene, the method comprising a process of performing an oxidative dehydrogenation reaction by introducing a reactant comprising butene, oxygen, nitrogen, and steam into a reactor which is filled with a catalyst, in which during a first start-up of the oxidative dehydrogenation reaction, the oxygen is introduced into the reactor before the butene, or the oxygen is introduced into the reactor simultaneously with the butene.

    Method of preparing multicomponent composite metal oxide catalyst
    10.
    发明授权
    Method of preparing multicomponent composite metal oxide catalyst 有权

    公开(公告)号：US10315969B2

    公开(公告)日：2019-06-11

    申请号：US14900290

    申请日：2015-06-04

    Applicant: LG CHEM, LTD.

    Inventor： Ye Seul Hwang ,  Dong Hyun Ko ,  Kyong Yong Cha ,  Dae Heung Choi ,  Myung Ji Suh ,  Jun Han Kang ,  Joo Hyuck Lee ,  Hyun Seok Nam ,  Jun Kyu Han ,  Sang Jin Han

    IPC: C07C5/333 ,  B01J23/887 ,  B01J37/03 ,  B01J37/04 ,  B01J37/08 ,  B01J23/00 ,  B01J23/881 ,  B01J35/00 ,  C07C5/48

    Abstract: Provided are a method of preparing a multicomponent bismuth-molybdenum composite metal oxide catalyst, and a multicomponent bismuth-molybdenum composite metal oxide catalyst prepared thereby. According to the preparation method, since the almost same structure as that of a typical quaternary bismuth-molybdenum catalyst may be obtained by performing two-step co-precipitation, i.e., primary and secondary co-precipitation, of metal components constituting the catalyst, the reduction of catalytic activity due to the deformation of the structure of the catalyst may be suppressed. Also, since the multicomponent bismuth-molybdenum composite metal oxide catalyst may adjust the number of lattice oxygens consumed during a reaction to increase the catalytic activity, the multicomponent bismuth-molybdenum composite metal oxide catalyst may reduce the formation of by-products and may improve the conversion rate of reactant and the yield of desired product in a catalytic reaction process using the above catalyst, particularly, a catalytic reaction process under a relatively low temperature condition.

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