A method for inhibiting polymerization of ethylene in compressor equipment in the production process of low density polyethylene

Abstract

The invention discloses a method for inhibiting polymerization of ethylene in compressor equipment in the production process of low-density polyethylene. The method prevents the self-polymerization of ethylene by adding a polymerization inhibitor in the secondary compressor in the production process of low-density polyethylene in a tubular reactor, effectively avoiding the increase in the pressure drop of the cooler and fouling of the equipment, and the polymerization inhibitor can be used as a The initiator in the reactor after the compressor; the polymerization inhibitor is oxygen or air. The invention effectively alleviates the problems of premature self-polymerization of ethylene raw materials and easy fouling of coolers in secondary compressors in the production process of high-pressure polyethylene. The method of the invention has the advantages of good polymerization inhibition effect, simple and convenient operation, no influence on production, online elimination of fouling of compressor coolers, and the like, and at the same time, the polymerization inhibitor can be efficiently utilized as an initiator in a subsequent process without post-treatment.

Description

Method for inhibiting ethylene polymerization in compressor equipment in a low-density polyethylene production process technical field The invention belongs to chemical field, be specifically related to ethylene in a kind of low-density polyethylene tubular process production process method of inhibition. Background technique [0002] It is known in the art that high pressure polyethylene polymerization processes are carried out in autoclaves or tubular reactors, usually using oxygen or Organic free-radical initiators, in particular peroxides, serve as initiators, resulting in low density ethylene polymers (LDPE). with the kettle method Compared with the process, the high-pressure tubular polyethylene process has the advantages of high single-pass conversion rate, low monomer consumption, long production cycle, and high production capacity. The advantages of large size, simple and reliable equipment, etc., so the tubular method is more widely used in my country. [00...

AI Technical Summary

Problems solved by technology

[0005] Due to the high pressure of the secondary compressor unit, ethylene self-polymerization may occur. With the extension of the operating time of the device, high-density, high-molecular-weight polymer scaling is easily formed on the inner wall of the intercooler of the secondary compressor, resulting in narrowing of the pipe diameter. , the pressure drop rises, and even the pipeline is blocked; in addition, during the operation of the equipment, the scaling objects will peel off from time to time and enter the pipeline, affecting the reaction

In particular, there is a need for on-line measures to prevent premature self-polymerization and fouling of ethylene in the condenser without stopping the operation, so as to reduce the reduction in production capacity and efficiency caused by regular shutdown and cleaning

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