Polyolefin kettle type reaction constant temperature control method and device

Abstract

The invention provides a polyolefin kettle type reaction constant temperature control method and device.The polyolefin kettle type reaction constant temperature control method comprises the steps that a, the real-time temperature value of a polyolefin reaction kettle is obtained, the real-time temperature value is compared with a preset temperature value, and if the real-time temperature value is different from the preset temperature value, the polyolefin reaction kettle is started; if yes, obtaining a real-time pressure value of the polyolefin reaction kettle according to the real-time temperature value; b) comparing the real-time pressure value with a preset pressure value, and if the real-time pressure value is greater than or equal to the preset pressure value, adjusting the valve position opening degree of the polyolefin reaction kettle to be a minimum value; if the real-time pressure value is smaller than the preset pressure value, the step c) is carried out; and c) according to the real-time pressure value and the preset pressure value of the polyolefin reaction kettle, obtaining the numerical value of the reaction water demand, and adjusting the valve position opening value of the polyolefin reaction kettle according to the numerical value of the reaction water demand. The device is beneficial to realizing constant-temperature automatic accurate control, reducing reaction temperature fluctuation and improving product quality.

Description

technical field [0001] The invention belongs to the field of reaction kettles, and in particular relates to a constant temperature control method and device for a polyolefin kettle type reaction. Background technique [0002] Polyolefin has the advantages of abundant raw materials, easy processing and molding, and excellent comprehensive performance. It is a kind of polymer material with large output and wide application. The polyolefin kettle reaction production process is a self-developed olefin polymerization production method in my country. It has the advantages of low production cost, quick effect, low energy consumption, good economic benefits, less "three wastes" and high safety performance. It is used in my country's oil refineries. widely. [0003] The material of the polyolefin kettle reaction is a mixed material, including monomers and hydrogen. As the polymerization reaction proceeds, the saturated vapor pressure changes. [0004] In recent years, with the devel...

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Problems solved by technology

[0004] In recent years, with the development of the polyolefin industry, the polyolefin kettle reaction production process has made great progress, and its application in the new product development stage has irreplaceable advantages, but there are still many areas to be improved. In terms of reaction control Constant pressure control is often achieved instead of constant temperature control, which has a great impact on the quality of polyolefin products, and there is a problem of single-loop control lag in the polymerization constant temperature control stage, resulting in large temperature fluctuations during the reaction process, which affects product melt index and molecular weight. and other important product quality indicators

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