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    Xylene separation process
    21.
    发明授权
    Xylene separation process 有权

    公开(公告)号：US09878968B2

    公开(公告)日：2018-01-30

    申请号：US15455502

    申请日：2017-03-10

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： John R. Porter ,  Michael W. Weber ,  Gaurav Agrawal

    IPC: C07C7/13 ,  B01D15/18

    CPC classification number: C07C7/13 ,  B01D15/1835 ,  C07C15/08

    Abstract: A process is described for separating paraxylene from a multicomponent fluid mixture of C8 aromatics. A mixture of C8 aromatics is fed to a simulated moving bed adsorptive apparatus having at least two sieve chambers and at least two rotary valves. Each sieve chamber may be operated individually using the PowerFeed process. The flow rates of the streams to or from the individual sieve chambers may be varied during the step time in an inverse manner such that a substantially constant flow to and from the apparatus is achieved. Alternatively, the flow rates to each sieve chamber may vary during the step time according to the same profile, but the rotary valves may be off-set and step independently in a staggered manner to achieve a substantially constant flow of a stream to or from the apparatus.

    Paraxylene separation process
    26.
    发明授权
    Paraxylene separation process 有权

    公开(公告)号：US09725378B2

    公开(公告)日：2017-08-08

    申请号：US14624861

    申请日：2015-02-18

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： John D. Ou ,  Jeevan S. Abichandani

    IPC: C07C5/27 ,  C07C6/12 ,  C07C5/22 ,  C07C4/02 ,  C07C6/06 ,  C07C7/12

    CPC classification number: C07C5/222 ,  C07C4/02 ,  C07C5/2732 ,  C07C5/277 ,  C07C6/06 ,  C07C7/12 ,  C07C2529/40 ,  C07C15/08

    Abstract: The invention relates to a p-xylene separation process wherein at least a portion of ethylbenzene present in an aromatics-containing feed is removed prior to isomerization. Aspects of the invention provide a process for producing p-xylene. The process includes providing a first mixture comprising ≧5.0 wt. % of aromatic C8 isomers, the C8 isomers comprising p-xylene and ethylbenzene. A p-xylene-containing portion and an ethylbenzene-containing portion are separated from the first mixture in a first separation stage to form a p-xylene-depleted raffinate. The first separation stage can include at least one simulated moving-bed adsorptive separation stage. At least a portion the p-xylene-depleted raffinate in the liquid phase is reacted to produce a reactor effluent comprising aromatic C8 isomers. The first mixture can be combined with ≧50.0 wt. % of the reactor effluent's aromatic C8 isomers. The combining can be carried out before and/or during the separating of the p-xylene and ethylbenzene portions.

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