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Control system for ethylene polymerization reactor

  • US 4,668,473 A
  • Filed: 08/23/1985
  • Issued: 05/26/1987
  • Est. Priority Date: 04/25/1983
  • Status: Expired due to Fees
First Claim
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1. A polymerization reactor comprising:

  • a feed line connected to an input of said reactor for transporting a raw material to be polymerized to the reactor;

    cooling means for cooling the reactor including means for causing a flow of coolant to the reactor;

    an exit line connected to an exit of said reactor for transporting a product of polymerization from the reactor;

    a product separator connected in the exit line beyond said reactor for separating the product from the raw material;

    quality sensing means positioned and arranged so as to sense the actual quality of the product in the exit line beyond said product separator;

    quality controller means connected to said quality sensing means for receiving a desired product quality set point and comparing it with the actual quality of the product and generating a desired temperature value of the reactor;

    temperature sensing means associated with the reactor and positioned and arranged to sense a representative temperature thereof;

    temperature control means connected to said temperature sensing means and to said quality controller means for comparing the representative temperature of the reactor with the desired temperature value therefor to generate a coolant flow value, said temperature control means connected to the cooling means for controlling the coolant flow to the reactor in accordance with the coolant flow value;

    a raw material flow regulator in the feed line for regulating an amount of raw material supplied to the reactor;

    a raw material concentration sensor in the exit line between said reactor and said product separator for sensing an amount of raw material admixed with the product in the exit line; and

    production rate controller means connected to said raw material concentration sensor and to said raw material flow regulator for receiving a desired production rate as a set point and comparing it with an actual production rate determined as a function of the raw material concentration therefor to generate a raw material feed flow rate value, said production rate controller means connected to said raw material flow regulator for regulating the amount of raw material supplied to the reactor in accordance with the raw material feed flow rate value.

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