公开(公告)号：US10786756B2

公开(公告)日：2020-09-29

申请号：US16074338

申请日：2017-02-09

Applicant: EXXONMOBIL CHEMICAL PATENTS INC. ,  GEORGIA TECH RESEARCH CORPORATION

Inventor： Michael W. Weber ,  Siwei Guo ,  Yoshiaki Kawajiri ,  Jason Bentley ,  Gaurav Agrawal ,  Michael Salciccioli ,  Dana L. Pilliod

IPC: B01D15/18 ,  C07C7/12 ,  C07C15/08 ,  C07C15/073

Abstract: The process involves the use of two rotary valves to implement Varicol operation of a simulated moving bed apparatus to separate a product from at least one multicomponent feed. In a particular embodiment, paraxylene is separated from a mixture of C8 aromatic hydrocarbons. The use of the Varicol process further enhances the separation of the desired product and provides flexibility with a simulated moving bed apparatus using dual rotary valves.

公开(公告)号：US09850186B2

公开(公告)日：2017-12-26

申请号：US15375754

申请日：2016-12-12

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Gaurav Agrawal ,  Michael W. Weber ,  Michael Salciccioli ,  John R. Porter ,  Dana L. Pilliod ,  Timothy P. Bender

IPC: C07C5/27

CPC classification number: C07C5/2767 ,  B01D15/1821 ,  C07C5/2702 ,  C07C5/2729 ,  C07C7/11 ,  C07C15/08

Abstract: A process for producing paraxylene is provided. The process includes separating a first mixture of C8 aromatic hydrocarbons in a simulated moving bed apparatus using a desorbent to produce (i) an extract comprising ≧50.0 wt % of the paraxylene in the first mixture; (ii) a desorbent-rich raffinate comprising ≧75 wt % of the desorbent withdrawn, and (iii) an desorbent-lean raffinate comprising ≦25 wt % of the desorbent withdrawn in the desorbent-rich and desorbent-lean raffinates. The desorbent-lean raffinate can then, without an intervening separation step, be passed to a refinery process or a vapor phase isomerization reaction to produce an effluent comprising paraxylene in a greater concentration than the desorbent-lean raffinate. The desorbent-rich raffinate can be passed to a liquid phase isomerization reaction to produce an effluent comprising paraxylene in a greater concentration than the desorbent-rich raffinate.

公开(公告)号：US20170305818A1

公开(公告)日：2017-10-26

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.

公开(公告)号：US20180002252A1

公开(公告)日：2018-01-04

申请号：US15600494

申请日：2017-05-19

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Michael Salciccioli ,  Gaurav Agrawal ,  Michael W. Weber ,  Dana L. Pilliod ,  Catherine M. Dorsi

IPC: C07C5/13 ,  C07C7/11 ,  C07B63/04 ,  C07C15/08 ,  C07C7/13 ,  C07C2601/16

CPC classification number: C07C5/13 ,  B01D15/1828 ,  B01D15/185 ,  C07B63/04 ,  C07C5/2708 ,  C07C5/277 ,  C07C7/005 ,  C07C7/11 ,  C07C7/12 ,  C07C7/13 ,  C07C15/08 ,  C07C2601/16

Abstract: Disclosed is a process for recovering paraxylene in which a first simulated moving bed adsorption unit is used to produce two extract streams—one rich in paraxylene and a paraxylene-rich extract stream that is lean in ethylbenzene and an ethylbenzene-rich extract stream that is lean in paraxylene- and a paraxylene-depleted raffinate stream. A significant amount of the ethylbenzene is removed in the ethylbenzene-rich extract stream (at least enough to limit buildup in the isomerization loop), so the paraxylene-depleted raffinate stream may be isomerized in the liquid phase. Avoiding vapor phase isomerization saves energy and capital, as liquid phase isomerization requires less energy and capital than the vapor phase isomerization process due to the requirement of vaporizing the paraxylene-depleted stream and the use of hydrogen, which requires an energy and capital intensive hydrogen recycle loop.

公开(公告)号：US20180334622A1

公开(公告)日：2018-11-22

申请号：US15971590

申请日：2018-05-04

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Gaurav Agrawal ,  Stephen T. Cohn ,  Kapil Kandel ,  Subramanya V. Nayak ,  Teng Xu

IPC: C10G47/04

CPC classification number: C10G47/04 ,  C10G9/36 ,  C10G45/38 ,  C10G47/00 ,  C10G65/04 ,  C10G65/12 ,  C10G2300/301 ,  C10G2400/04

Abstract: A hydrocarbon conversion process comprises providing a hydrocarbon feedstock comprising an effluent fraction from a pyrolysis process, wherein the effluent fraction has an initial boiling point at atmospheric pressure of at least 177° C. and a final boiling point at atmospheric pressure of no more than 343° C. and comprises at least 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the effluent fraction. The hydrocarbon feedstock is hydroprocessed in at least one hydroprocessing zone in the presence of treatment gas comprising molecular hydrogen under catalytic hydroprocessing conditions to produce a hydroprocessed product comprising less than 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the hydroprocessed product. The hydroprocessing conditions comprise a temperature from 150 to 350° C. and a pressure from 500 to 1500 psig (3550 to 10445 kPa-a).