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14 条记录 (耗时 0.011 秒)

    Agitated reactor and gas fluidized bed reactor in series for polymerization of vinyl chloride
    1.
    发明授权
    Agitated reactor and gas fluidized bed reactor in series for polymerization of vinyl chloride 失效
    用于氯乙烯聚合的系列中的催化反应器和气体流化床反应器

    公开(公告)号：US3622553A

    公开(公告)日：1971-11-23

    申请号：US3622553D

    申请日：1967-12-18

    申请人： PHILLIPS PETROLEUM CO

    发明人： CINES MARTIN R

    IPC分类号： C08F2/00 ,  C08F14/06 ,  C08F3/30 ,  C08F1/04

    CPC分类号： C08F14/06 ,  Y10S526/921 ,  C08F2/34

    摘要： Vinyl chloride, alone or with a suitable comonomer, is continuously polymerized under liquid phase bulk conditions in an agitated reactor to a solid polymer content about 15 percent. A portion of the reaction effluent is continuously or periodically withdrawn from the agitated reactor and flushed into a fluidized bed reactor wherein vaporous vinyl chloride is employed as the fluidizing gas. Vinyl chloride gas is withdrawn and at least a portion thereof reintroduced into the fluidized reactor as the fluidizing gas. The excess vinyl chloride gas can be condensed and recycled to the agitated reactor. A polymer stream is withdrawn and passed through a monomer recovery system which can include a wash tower, a flash tank, drying conveyors and inert gas and/or vacuum strippers.

    Processes for preparing copolymers
    4.
    发明授权
    Processes for preparing copolymers 失效
    制备共聚物的方法

    公开(公告)号：US6124409A

    公开(公告)日：2000-09-26

    申请号：US929457

    申请日：1992-08-12

    申请人： T. Hwee Ng ,  Hadi K. Mahabadi ,  Man C. Tam ,  Gregory J. Kovacs ,  Eric M. Peters ,  Rafik O. Loutfy

    发明人： T. Hwee Ng ,  Hadi K. Mahabadi ,  Man C. Tam ,  Gregory J. Kovacs ,  Eric M. Peters ,  Rafik O. Loutfy

    IPC分类号： C08F2/00 ,  C08F2/06 ,  C08F2/18 ,  C08F4/38

    CPC分类号： C08F2/001 ,  C08F2/06 ,  Y10S526/921

    摘要： Disclosed is a process for preparing copolymers which comprises, in the order stated: (1) adding monomers containing unsaturated carbon-to-carbon bonds, a first polymerization initiator, a second polymerization initiator, and a solvent to a reaction vessel; (2) purging the resulting solution with an inert gas; (3) sealing the reaction vessel and pressurizing it by addition of an inert gas to a pressure of from about 20 to about 600 kilopascals over ambient atmospheric pressure; (4) maintaining the temperature within the pressurized reaction vessel at a temperature of from about 50 to about 100.degree. C. for a period of from about 60 to about 300 minutes; (5) thereafter maintaining the temperature within the pressurized reaction vessel at a temperature of from about 80 to about 115.degree. C. for a period of from about 30 to about 300 minutes, wherein the temperature in step (5) is higher than the temperature in step (4); and (6) subsequently maintaining the temperature within the pressurized reaction vessel at a temperature of from about 115 to about 160.degree. C. for a period of from about 30 to about 180 minutes, wherein the temperature in step (6) is higher than the temperature in step (5). Polymers prepared according to the process of the present invention can be particularly useful in migration imaging members.

    摘要翻译： 公开了一种制备共聚物的方法，其顺序包括：（1）向反应容器中加入含有不饱和碳 - 碳键的单体，第一聚合引发剂，第二聚合引发剂和溶剂; （2）用惰性气体吹扫所得溶液; （3）密封反应容器并通过在环境大气压下加入约20至约600千帕斯卡的惰性气体对其加压; （4）将加压反应容器内的温度维持在约50至约100℃的温度下约60至约300分钟; （5）之后将加压反应容器内的温度保持在约80至约115℃的温度下约30至约300分钟的时间，其中步骤（5）中的温度高于温度 在步骤（4）中; 和（6）随后将加压反应容器内的温度保持在约115至约160℃的温度下约30至约180分钟的时间，其中步骤（6）中的温度高于 步骤（5）中的温度。 根据本发明的方法制备的聚合物可以在迁移成像构件中特别有用。

    Manufacture of high pressure polyethylene
    7.
    发明授权
    Manufacture of high pressure polyethylene 失效
    制造高压聚乙烯

    公开(公告)号：US4153774A

    公开(公告)日：1979-05-08

    申请号：US850398

    申请日：1977-11-10

    申请人： Klaus Boettcher ,  Heinrich G. Hoerdt ,  Wieland Zacher ,  Oskar Buechner

    发明人： Klaus Boettcher ,  Heinrich G. Hoerdt ,  Wieland Zacher ,  Oskar Buechner

    IPC分类号： C08F6/26 ,  C08F6/00 ,  C08F10/02

    CPC分类号： C08F6/26 ,  Y10S526/921

    摘要： A process for the high pressure polymerization of ethylene at elevated temperatures in a polymerization zone followed by transfer of the reaction mixture, through a cooling zone, into the separation zone. In this process, the pressure at the cooling zone outlet is periodically reduced briefly, at recurring intervals, these brief pressure reductions being independent of the pressure reductions in the polymerization zone. Using this process, the conversion in the polymerization unit can be increased and a more homogeneous ethylene polymer can be obtained.

    摘要翻译： 在聚合区域中在高温下高压聚合乙烯的方法，然后将反应混合物通过冷却区转移到分离区中。 在此过程中，冷却区出口处的压力周期性地以重复的间隔周期性地减小，这些简单的压力降低与聚合区域中的压力降低无关。 使用该方法可以提高聚合单元中的转化率，并可获得更均匀的乙烯聚合物。