知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

53 records (took 0.059 seconds)

    Processes for Converting Benzene and/or Toluene Via Methylation
    21.
    发明申请
    Processes for Converting Benzene and/or Toluene Via Methylation 有权

    公开(公告)号：US20220119324A1

    公开(公告)日：2022-04-21

    申请号：US17431745

    申请日：2020-03-18

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Seth M. Washburn ,  Hsu Chiang ,  Umar Aslam ,  Wenyih F. Lai ,  Doron Levin ,  Tan-Jen Chen

    IPC: C07C2/86 ,  B01J29/70

    Abstract: This disclosure provides improved processes for converting benzene/toluene via methylation with methanol/dimethyl ether for producing, e.g., p-xylene. In an embodiment, a process utilizes a methylation catalyst system comprising a molecular sieve catalyst and an auxiliary catalyst. The auxiliary catalyst comprises a metal element selected from Group 2, Group 3, the lanthanide series, the actinide series, and mixtures and combinations thereof. The auxiliary catalyst may comprise the oxide of the metal element. Deactivation of the molecular sieve catalyst can be reduced with the inclusion of the auxiliary catalyst in the methylation catalyst system.

    Process for Producing Paraxylene by Methylation of Benzene and/or Toluene
    23.
    发明申请
    Process for Producing Paraxylene by Methylation of Benzene and/or Toluene 审中-公开

    公开(公告)号：US20190169087A1

    公开(公告)日：2019-06-06

    申请号：US16271386

    申请日：2019-02-08

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Tan-Jen Chen ,  Seth M. Washburn

    IPC: C07C2/66 ,  C07C2/86 ,  B01J29/70

    Abstract: A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index≤5, and the alkylation conditions comprise a temperature less than 500° C. Paraxylene may then be recovered from the alkylated aromatic product.

    Process for making cyclohexanone
    24.
    发明授权
    Process for making cyclohexanone 有权

    公开(公告)号：US10252968B2

    公开(公告)日：2019-04-09

    申请号：US15742910

    申请日：2016-06-17

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Jihad M. Dakka ,  Ashley J. Malik ,  Christopher L. Becker ,  Jason D. Davis ,  Kirk C. Nadler ,  Jose M. Vargas ,  Tan-Jen Chen ,  Seth M. Washburn ,  Jörg F. W. Weber

    IPC: C07C45/82 ,  C07C45/00 ,  C07C37/74

    Abstract: Disclosed are novel processes for making cyclohexanone compositions, from a mixture comprising phenol, cyclohexanone, and cyclohexylbenzene. The process includes hydrogenation of a feed stream comprising phenol, cyclohexanone, and cyclohexylbenzene. The feed stream may be subjected to one or more pre-hydrogenation treatments, such as passing through one or more sorbents, addition of basic chemical agents, and/or addition of water, so as to improve catalyst activity, minimize undesired side reactions, and/or remove catalyst poisons from the feed stream. The feed stream may be provided to a hydrogenation reaction zone in the vapor phase, with periodic alterations to hydrogenation reaction conditions such that the feed is provided in mixed liquid and vapor phase in order to carry out liquid washing of a hydrogenation catalyst bed within the hydrogenation reaction zone.

    Process for selectivating catalyst for producing paraxylene by methylation of benzene and/or toluene
    25.
    发明授权
    Process for selectivating catalyst for producing paraxylene by methylation of benzene and/or toluene 有权

    公开(公告)号：US10246387B2

    公开(公告)日：2019-04-02

    申请号：US15702469

    申请日：2017-09-12

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Tan-Jen Chen

    IPC: C07C2/66 ,  C07C15/08 ,  B01J29/70 ,  C07C15/04 ,  C07C15/06 ,  C07C2/86

    Abstract: A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index ≤5, and the alkylation conditions comprise a temperature less than 500° C. The alkylation catalyst may be selectivated to produce a higher than equilibrium amount of paraxylene by using a molar ratio of alkylating agent to aromatic of at least 1:4.

Patent Agency Ranking