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    PROCESS FOR TRANSITIONING BETWEEN INCOMPATIBLE CATALYSTS
    6.
    发明申请
    PROCESS FOR TRANSITIONING BETWEEN INCOMPATIBLE CATALYSTS 有权

    公开(公告)号：US20170190816A1

    公开(公告)日：2017-07-06

    申请号：US15313758

    申请日：2015-05-26

    Applicant: SABIC Global Technologies B.V.

    Inventor： Nayef M. AL-ENAZI

    IPC: C08F210/16

    CPC classification number: C08F210/16 ,  C08F2410/05 ,  C08F4/6565 ,  C08F4/6546 ,  C08F2/34 ,  C08F210/08 ,  C08F2500/07 ,  C08F2500/12 ,  C08F4/69 ,  C08F2500/08 ,  C08F4/025

    Abstract: The invention relates to a process for transitioning from a first contiunuous polymerization reaction of ethylene and a first comonomer for producing a linear low density polyethylene conducted in the presence of a Ziegler-Natta catalyst in a gas phase reactor to a second contiunuous polymerization reaction of ethylene and a second comonomer for producing a high density polyethylene conducted in the presence of a chromium-based catalyst in the gas phase reactor, the process comprising: (i) reducing the feed of the first comonomer into the reactor until the ratio of the first comonomer to ethylene in the reactor is at most 0.1; (ii) discontinuing the introduction of the Ziegler-Natta catalyst while the introduction of a co-catalyst of the Ziegler-Natta catalyst is continued and subsequently discontinuing the introduction of the co-catalyst; (iii) maintaining the polymerization conditions in the reactor and permitting polymerization to continue for a time in order to allow the components of the Ziegler-Natta catalyst present in the reactor to consume themselves in the production of additional polymer; (iv) discontinuing the introduction of all feeds into the reactor; (v) depressurizing the reactor; (vi) flow-purging the reactor; (vii) reducing the reactor temperature; (viii) introducing ethylene and H2 into the reactor to obtain a partial pressure of ethylene and a volume ratio of H2 to ethylene for the second polymerization reaction, wherein the partial pressure of ethylene is increased to the pressure for the second polymerization reaction at such a speed that the reactor temperature is maintained at a temperature lower than the temperature of the first polymerization conditions; (ix) increasing the reactor temperature to a temperature of the second polymerization conditions; (x) introducing the second catalyst into the reactor and (xi) introducing the second comonomer into the reactor to obtain a reactor composition for the second polymerization reaction.

    A POLYMERIZATION PROCESS FOR THE PRODUCTION OF HIGH DENSITY POLYETHYLENE
    10.
    发明申请
    A POLYMERIZATION PROCESS FOR THE PRODUCTION OF HIGH DENSITY POLYETHYLENE 有权
    用于生产高密度聚乙烯的聚合方法

    公开(公告)号：US20160046739A1

    公开(公告)日：2016-02-18

    申请号：US14780236

    申请日：2014-03-27

    Applicant: SAUDI BASIC INDUSTRIES CORPORATION

    Inventor： Vugar ALIYEV ,  Ian BLACKMORE

    IPC: C08F110/02 ,  C08J5/00

    CPC classification number: C08F110/02 ,  C08F4/69 ,  C08J5/00 ,  C08J2323/06 ,  C08F4/24 ,  C08F2500/01 ,  C08F2500/07 ,  C08F2500/12 ,  C08F2500/18 ,  C08F4/22

    Abstract: The invention relates to a polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a chromium compound, a support material wherein the alcohol is a primary alcohol having the formula (I) wherein R, R′ and R″ are the same or different and respectively represent a linear or branched N alkyl, cycloalkyl, phenyl or phenyl containing radicals comprising from 5 to 15 carbon atoms and wherein only one of R, R′ or R″ can be a hydrogen radical and/or wherein the alcohol is a secondary alcohol and/or a secondary cyclic alcohol. The catalyst composition may also comprise a titanium compound. The high density polyethylene may be applied in the production of blow molded articles.

    Abstract translation: 本发明涉及通过在包含铬化合物的催化剂组合物，其中醇是具有式（I）的伯醇的载体材料存在下聚合制备高密度聚乙烯的聚合方法，其中R，R '和R“相同或不同，分别表示包含5至15个碳原子的直链或支链的N，烷基，环烷基，苯基或苯基，其中R，R'或R”中只有一个可以是氢原子 和/或其中所述醇是仲醇和/或仲环状醇。 催化剂组合物还可以包含钛化合物。 高密度聚乙烯可用于生产吹塑制品。

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