Apparatus for controlling operational parameters in polymerization
equipment
    122.
    发明授权
    Apparatus for controlling operational parameters in polymerization equipment 失效
    用于控制聚合设备中操作参数的设备

    公开(公告)号:US4008049A

    公开(公告)日:1977-02-15

    申请号:US302309

    申请日:1972-10-30

    Abstract: In apparatus for polymerizing high-pressure ethylene to produce polyethylene, a tubular reactor is connected to a source of high pressure ethylene. An intensifier supplies an initiator solution to the tubular reactor. This solution includes one or more catalysts which promote the polymerization reaction. Within the tubular reactor, a peak temperature occurs in proximity of the point at which the catalysts are introduced. If the catalysts are introduced at more than one point, peak temperatures will result downstream of each of such points. For various reasons, the peak temperatures are displaced along the tubular reactor and a plurality of thermocouples are distributed at spaced positions in the tubular reactor to measure the temperatures at the positions at which the peak temperature might occur. These thermocouples generate signals which are fed into a gating arrangement which selects the peak signal which is compared in a comparator circuit with an adjustable or selectable signal representative of the peak temperature which is desired. A difference signal is generated which relates to the difference between the selected signal and the peak signal with which it is compared. This difference signal is converted by a transducer into a pressure signal which is fed to a control valve which controls the speed of operation of a pump feeding the catalysts into the reactor. If two or more pumps are employed for feeding the catalysts into different zones in the reactor, separate controls are provided for each of the pumps.

    Abstract translation: 在用于聚合高压乙烯以制备聚乙烯的装置中,管式反应器连接到高压乙烯源。 增压器将引发剂溶液提供给管式反应器。 该溶液包括促进聚合反应的一种或多种催化剂。 在管式反应器内,峰值温度发生在引入催化剂的点附近。 如果在多于一个点引入催化剂,则峰值温度将导致每个这些点的下游。 由于各种原因,峰值温度沿着管状反应器移位,并且多个热电偶在管状反应器中的间隔位置处分布,以测量在峰值温度可能发生的位置处的温度。 这些热电偶产生被馈送到选通装置的信号,其选择在比较器电路中比较峰值信号与表示期望的峰值温度的可调节或可选择的信号。 产生与选择的信号和与其进行比较的峰值信号之间的差异相关的差分信号。 该差分信号由换能器转换成压力信号,该压力信号被馈送到控制阀,该控制阀控制将催化剂进入反应器的泵的操作速度。 如果使用两个或更多个泵将催化剂进料到反应器中的不同区域,则为每个泵提供单独的控制。

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