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    METHOD FOR MAKING BASE OIL WITH ENHANCED COLOR STABILITY
    1.
    发明公开
    METHOD FOR MAKING BASE OIL WITH ENHANCED COLOR STABILITY 审中-公开

    公开(公告)号：US20240110120A1

    公开(公告)日：2024-04-04

    申请号：US18262171

    申请日：2022-01-18

    Applicant: CHEVRON U.S.A. INC.

    Inventor： Yihua ZHANG ,  Guan-Dao LEI ,  Malek M. ROSTAMI ,  Beth A. RUSSELL

    IPC: C10M133/44 ,  C10M169/04

    CPC classification number: C10M133/44 ,  C10M169/04 ,  C10N2030/20

    Abstract: A method for making a base oil having enhanced color stability and the base oil prepared therefrom are disclosed. The method comprises adding a phenyl benzotriazole compound to a base oil composition to form a color-stabilized base oil composition. In some cases, the phenyl benzotriazole compound has the structural formula (I):




    wherein,



    R and R′ are independently one or more substituents selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted cycloalkyl, substituted and unsubstituted alkoxy, substituted and unsubstituted carboxyl, or a combination thereof, with the proviso that at least one of R and R′ is a non-hydrogen substituent.

    BASE OIL HYDROTREATING CATALYST AND PROCESS OF USE
    7.
    发明申请
    BASE OIL HYDROTREATING CATALYST AND PROCESS OF USE 有权

    公开(公告)号：US20220288566A1

    公开(公告)日：2022-09-15

    申请号：US17199282

    申请日：2021-03-11

    Applicant: CHEVRON U.S.A. INC.

    Inventor： Yihua ZHANG ,  Guan-Dao LEI ,  Bi-Zeng ZHAN

    IPC: B01J23/44 ,  B01J21/12 ,  B01J35/10 ,  C10M101/02 ,  C10M177/00 ,  C10G45/62

    Abstract: An improved hydrotreating catalyst and process for making a base oil product wherein the catalyst comprises a base extrudate that includes a high nanopore volume amorphous silica alumina (ASA) and a second amorphous silica alumina. The catalyst and process generally involve the use of a base extrudate comprising the high nanopore volume ASA and the second ASA in a catalyst to produce hydrotreated dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst base extrudate advantageously comprises a first amorphous silica alumina having a pore volume in the 11-20 nm pore diameter range of 0.2 to 1.0 cc/g and a second amorphous silica alumina having a pore volume in the 11-20 nm pore diameter range of 0.02 to 0.2 cc/g, with the base extrudate formed from the amorphous silica alumina and the alumina having a total pore volume in the 2-50 nm pore diameter range of 0.12 to 1.80 cc/g. The catalyst further comprises at least one modifier element from Groups 6 to 10 and Group 14 of the Periodic Table. The catalyst and process provide improved aromatics saturation.

    HYDROISOMERIZATION CATALYSTS
    8.
    发明申请
    HYDROISOMERIZATION CATALYSTS 有权

    公开(公告)号：US20220219152A1

    公开(公告)日：2022-07-14

    申请号：US17147725

    申请日：2021-01-13

    Applicant: CHEVRON U.S.A. INC.

    Inventor： Yihua ZHANG ,  Adeola Florence OJO ,  Guan-Dao LEI

    IPC: B01J29/76 ,  B01J35/02 ,  C10G45/64

    Abstract: A hydroisomerization catalyst comprising a molecular sieve belonging to the ZSM-48 family of zeolites; an inorganic oxide support; one or more first modifiers selected from Groups 8 to 10; and one or more second modifiers selected from the group consisting of calcium (Ca), chromium (Cr), magnesium (Mg), lanthanum (La), barium (Ba), praseodymium (Pr), strontium (Sr), potassium (K) and neodymium (Nd). The molecular sieve comprises: a silicon oxide to aluminum oxide mole ratio of about 40 to about 220; at least about 70% polytype 6 of the total ZSM-48-type material present in the product; and an additional EUO-type molecular sieve phase in an amount of between about 0 and about 7.0 percent by weight of the total product. The molecular sieve has a morphology characterized as polycrystalline aggregates comprising crystallites collectively having an average aspect ratio of between about 1 and about 8.

    CATALYST SYSTEM AND PROCESS USING SSZ-91 AND SSZ-95
    9.
    发明申请
    CATALYST SYSTEM AND PROCESS USING SSZ-91 AND SSZ-95 有权

    公开(公告)号：US20220143588A1

    公开(公告)日：2022-05-12

    申请号：US17095337

    申请日：2020-11-11

    Applicant: CHEVRON U.S.A. INC.

    Inventor： Yihua ZHANG ,  Guan-Dao LEI

    IPC: B01J29/74 ,  C10G45/64 ,  C10G47/20 ,  C10G25/03

    Abstract: An improved hydroisomerization catalyst system and process for making a base oil product using a combined catalyst system comprising SSZ-91 molecular sieve and SSZ-95 molecular sieve. The catalyst system and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve and a separate catalyst comprising an SSZ-95 molecular sieve to produce dewaxed base oil products by sequentially contacting the catalysts with a hydrocarbon feedstock. The catalyst system and process provide improved base oil yield along with other beneficial base oil properties.

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