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    Methods for limiting water in recycled solvent during linear alpha olefin syntheses
    8.
    发明授权
    Methods for limiting water in recycled solvent during linear alpha olefin syntheses 有权

    公开(公告)号：US11512031B2

    公开(公告)日：2022-11-29

    申请号：US17297392

    申请日：2019-11-14

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Paul Hamilton ,  Terrance C. Osby ,  Brian W. Heins

    IPC: C07C2/30 ,  B01D3/14 ,  B01J31/22 ,  C07C7/00 ,  C07C7/04

    Abstract: Linear alpha olefins (LAOS) may be formed by oligomerization of ethylene in the presence of a Ziegler-type catalyst. The presence of trace water during oligomerization can result in unwanted formation of insoluble higher oligomers or polymer. Methods for limiting the presence of water during ethylene oligomerization reactions may include separating residual ethylene and 1-butene from an LAO product stream to form a higher LAO-enriched stream comprising C6+ LAOs, separating 1-hexene as an overhead stream from the higher-LAO enriched stream using a first distillation column, obtaining separated solvent as a side stream from the first distillation column or as a side stream from a first of one or more downstream distillation columns, and returning the separated solvent to a reactor in a recycled solvent stream. The recycled solvent stream passes through one or more driers before returning to the reactor.

    Recovery of Olefins from Para-Xylene Process
    10.
    发明申请
    Recovery of Olefins from Para-Xylene Process 审中-公开
    从对二甲苯方法回收烯烃

    公开(公告)号：US20140100402A1

    公开(公告)日：2014-04-10

    申请号：US14035040

    申请日：2013-09-24

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Allen S. Gawlik ,  Indulis J. Eilands ,  Terrance C. Osby

    IPC: C07C2/86

    CPC classification number: C07C2/864 ,  C07C7/005 ,  Y02P20/52 ,  C07C15/08 ,  C07C11/04 ,  C07C11/06

    Abstract: A process for producing para-xylene, by (a) contacting toluene with methanol in the presence of an alkylation catalyst under conditions effective to produce an alkylation effluent comprising xylenes and a by-product mixture comprising water, dimethyl ether and C4− hydrocarbons; (b) separating the alkylation effluent into a first fraction containing xylenes and a second fraction containing the by-product mixture; (c) removing water from the second fraction to produce a dried by-product mixture; (d) fractionating the dried by-product mixture to separate the mixture into a bottoms stream containing dimethyl ether and an overhead stream containing at least some of the C4- hydrocarbons; and (e) recovering ethylene and propylene from the overhead stream.

    Abstract translation: （a）在烷基化催化剂存在下，在有效生成包含二甲苯和包含水，二甲醚和C4-烃的副产物混合物的烷基化流出物的条件下，使甲苯与甲醇接触，制备对二甲苯的方法; （b）将烷基化流出物分离成含有二甲苯的第一级分和含有副产物混合物的第二级分; （c）从第二级分除去水以产生干燥的副产物混合物; （d）将干燥的副产物混合物分馏，将混合物分离成含有二甲醚和含有至少一些C 4 -C 4烃的塔顶流的塔底物流; 和（e）从塔顶馏出物流中回收乙烯和丙烯。

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