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公开(公告)号：US10988698B2
公开(公告)日：2021-04-27
申请号：US16467781
申请日：2017-12-01
Applicant: ExxonMobil Chemical Patents Inc.
Inventor： Kapil Kandel , Krystle J. Emanuele , Glenn A. Heeter , Gaurav Agrawal , Jeffrey C. Yeh , Teng Xu
IPC: C10G69/06
Abstract: This invention relates to thermally-treating and hydroprocessing pyrolysis tar to produce a hydroprocessed pyrolysis tar, but without excessive foulant accumulation during the hydroprocessing. The invention also relates to upgrading the hydroprocessed tar by additional hydroprocessing; to products of such processing; to blends comprising one or more of such products; and to the use of such products and blends, e.g., as lubricants, fuels, and/or constituents thereof.
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公开(公告)号：US20200063046A1
公开(公告)日：2020-02-27
申请号：US16467781
申请日：2017-12-01
Applicant: ExxonMobil Chemical Patents Inc.
Inventor： Kapil Kandel , Krystle J. Emanuele , Glenn A. Heeter , Gaurav Agrawal , Jeffrey C. Yeh , Teng Xu
IPC: C10G69/06
Abstract: This invention relates to thermally-treating and hydroprocessing pyrolysis tar to produce a hydroprocessed pyrolysis tar, but without excessive foulant accumulation during the hydroprocessing. The invention also relates to upgrading the hydroprocessed tar by additional hydroprocessing; to products of such processing; to blends comprising one or more of such products; and to the use of such products and blends, e.g., as lubricants, fuels, and/or constituents thereof.
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公开(公告)号：US10392324B2
公开(公告)日：2019-08-27
申请号：US16097734
申请日：2017-05-17
Inventor： Michael W. Weber , Yoshiaki Kawajiri , Michael Salciccioli , John R. Porter , Gaurav Agrawal , Dana L. Pilliod , Siwei Guo , Jason Bentley
IPC: C07C7/13 , B01D53/08 , C07C15/08 , C07C15/073 , B01J20/16
Abstract: A process to separate paraxylene from a mixture of paraxylene, metaxylene, orthoxylene, and ethylbenzene in a commercial simulated moving bed apparatus in a reduced number of beds is provided, allowing an additional separation to be conducted in the remaining beds. This additional separation may separate another xylene isomer, ethylbenzene, or a non-aromatic C8+ hydrocarbon from the raffinate stream produced by the first separation. A PowerFeed process is used to recover paraxylene in a first adsorption zone containing 8-16 beds of a conventional 24-bed simulated moving bed adsorption apparatus, and then a second separation may be conducted in a second adsorption zone containing the remaining beds.
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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
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.
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公开(公告)号：US20240384181A1
公开(公告)日：2024-11-21
申请号：US18690673
申请日：2022-10-03
Applicant: ExxonMobil Chemical Patents Inc.
Inventor： Sundar Narayanan , Gaurav Agrawal , Teng Xu
Abstract: The present disclosure generally relates to methods for reducing fouling in tar upgrading processes and to apparatus for carrying out such processes. In some embodiments, a method is provided that includes providing a first tar stream, combining the first tar stream with a utility fluid to form a first process stream having a viscosity lower than that of the first tar stream, and heating the first process stream in a pre-heater under liquid phase conditions without feeding molecular hydrogen gas into the pre-heater to form a second process stream exiting the pre-heater.
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Patent Agency Ranking
公开(公告)号：US10351489B2
公开(公告)日：2019-07-16
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
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.
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公开(公告)号：US10344222B2
公开(公告)日：2019-07-09
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
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).
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公开(公告)号：US10300404B2
公开(公告)日：2019-05-28
申请号：US15600517
申请日：2017-05-19
Applicant: ExxonMobil Chemical Patents Inc.
Inventor： Catherine M. Dorsi , Gaurav Agrawal , Michael W. Weber , Dana L. Pilliod , John R. Porter
Abstract: Disclosed herein are processes for recovering paraxylene in which a first simulated moving bed adsorption unit is used to produce a paraxylene-rich extract stream that also contains a significant amount of the ethylbenzene and a paraxylene-depleted raffinate stream. Because a significant amount of the ethylbenzene is removed in the paraxylene-rich extract stream (at least enough to limit buildup in the isomerization loop), 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.
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公开(公告)号：US20180002253A1
公开(公告)日：2018-01-04
申请号：US15600517
申请日：2017-05-19
Applicant: ExxonMobil Chemical Patents Inc.
Inventor： Catherine M. Dorsi , Gaurav Agrawal , Michael W. Weber , Dana L. Pilliod , John R. Porter
CPC classification number: B01D15/1828 , B01D3/065 , B01D2255/50 , C07C5/2708 , C07C7/005 , C07C7/12 , C07C7/14 , C07C15/08
Abstract: Disclosed herein are processes for recovering paraxylene in which a first simulated moving bed adsorption unit is used to produce a paraxylene-rich extract stream that also contains a significant amount of the ethylbenzene and a paraxylene-depleted raffinate stream. Because a significant amount of the ethylbenzene is removed in the paraxylene-rich extract stream (at least enough to limit buildup in the isomerization loop), 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.
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公开(公告)号：US20170247301A1
公开(公告)日：2017-08-31
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.
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