Method for carrying out radical ethylene high-pressure polymerization while preventing undesired polymer deposits
    1.
    发明授权
    Method for carrying out radical ethylene high-pressure polymerization while preventing undesired polymer deposits 有权
    进行自由基乙烯高压聚合同时防止不期望的聚合物沉积物的方法

    公开(公告)号:US06562915B2

    公开(公告)日:2003-05-13

    申请号:US10182563

    申请日:2002-07-31

    IPC分类号: C08F240

    摘要: In a process for the polymerization or copolymerization of ethylenically unsaturated monomers in the presence of polymerization initiators which decompose to form free radicals in a continuously operated polymerization apparatus comprising a fresh gas feed line, a precompressor, a postcompressor, a reactor, a pressure maintenance valve, a high-pressure circuit having a high-pressure product separator and a high-pressure circulation gas return line, a product valve and a low-pressure circuit having a low-pressure product separator and a low-pressure circulation gas return line, nitrogen monoxide or oxygen is introduced as inhibitor into the high-pressure circuit, into the low-pressure circuit and/or the precompressor.

    摘要翻译: 在用于在连续操作的聚合装置中分解形成自由基的聚合引发剂存在下烯键式不饱和单体的聚合或共聚的方法中,所述聚合引发剂包括新鲜气体进料管线,预压缩机,后压缩机,反应器,压力维持阀 具有高压产品分离器和高压循环气体返回管路的高压回路,具有低压产品分离器和低压循环气体返回管路的产品阀和低压回路,氮气 将一氧化碳或氧气作为抑制剂引入高压回路中,进入低压回路和/或预压缩机。

    Pressurization of ethylenically unsaturated monomers
    4.
    发明授权
    Pressurization of ethylenically unsaturated monomers 失效
    烯属不饱和单体的加压

    公开(公告)号:US06350827B1

    公开(公告)日:2002-02-26

    申请号:US09452451

    申请日:1999-12-02

    IPC分类号: C08F240

    摘要: Disclosed is a process for pressurizing ethylenically unsaturated monomers to 200-5000 bar in the absence of a polymerization initiator, which comprises effecting said pressurizing in the presence of nitroxyl compounds of the formula I where R1 and R2 are singly C1-C4-alkyl or combine with the joining carbon atom to form a 5- or 6-membered saturated hydrocarbon ring, R3 is C1-C4-alkyl, and R4 is hydrogen or C1-C12-alkyl. Also disclosed are a process for preparing copolymers by such pressurization and subsequent polymerization and copolymers obtainable thereby.

    摘要翻译: 公开了一种在不存在聚合引发剂的情况下将烯属不饱和单体加压至200-5000巴的方法,其包括在式I的硝酰基化合物存在下进行所述加压,其中R 1和R 2是单C1-C4烷基或与 连接碳原子以形成5-或6-元饱和烃环,R 3为C 1 -C 4 - 烷基,R 4为氢或C 1 -C 12 - 烷基。还公开了通过这种加压和随后的聚合和共聚物制备共聚物的方法 从而获得。

    Preparation of polyethylene waxes
    8.
    发明授权
    Preparation of polyethylene waxes 失效
    聚乙烯蜡的制备

    公开(公告)号:US06649788B2

    公开(公告)日:2003-11-18

    申请号:US09809252

    申请日:2001-03-16

    IPC分类号: C07C6952

    摘要: In a process for preparing polyethylene waxes at from 200 to 350° C. and pressures in the range from 500 to 4 000 bar using molar mass regulators, a peroxide mixture comprising from 5 to 95% by weight of at least one cyclic peroxide of the formula I, where the radicals R are identical or different and are selected from among alkyl groups and aryl groups, is used as free radical initiator and a molar H2/ethylene ratio of from 1:2 000 to 1:40 000 is employed.

    摘要翻译: 在使用摩尔质量调节剂在200-350℃制备聚乙烯蜡和500-4000巴范围内的压力的方法中,过氧化物混合物包含5-95重量%的至少一种环状过氧化物 其中基团R相同或不同并且选自烷基和芳基的式I被用作自由基引发剂,并且使用1:2000至1:40000的摩尔H 2 /乙烯比。

    Gas phase polymerization method
    9.
    发明授权
    Gas phase polymerization method 失效
    气相聚合法

    公开(公告)号:US06596822B1

    公开(公告)日:2003-07-22

    申请号:US10089749

    申请日:2002-04-02

    IPC分类号: C08F234

    摘要: The invention relates to a method and an apparatus for the polymerization of gaseous olefins, in particular of ethylene and at least one &agr;-olefin, in the gas phase in a stirred or fluidized, catalyst-containing polymerization zone (2) and at least one decompression zone (6, 10) downstream of the polymerization zone (2). The mixture of solid (co)polymer and unreacted monomers leaving the polymerization zone (2) flows through a settling zone, in particular in the form of a settling leg (14), before the decompression zone.

    摘要翻译: 本发明涉及用于在搅拌或流化的含催化剂的聚合区(2)中的气相中气态烯烃,特别是乙烯和至少一种α-烯烃的聚合的方法和装置,以及至少一种 在聚合区(2)下游的减压区(6,10)。 离开聚合区(2)的固体(共)聚合物和未反应单体的混合物在减压区之前流过沉降区,特别是沉降腿(14)的形式。