On-line control method for oxidation mother liquor filter process in purified terephthalic acid production

Abstract

The invention relates to an on-line control method for an oxidation mother liquor filter process in purified terephthalic acid production. The method comprises the following steps: normalizing technological operation parameters which influence the solid content in the filtrate in the filter process; carrying out analog computation by utilizing an improved standard BP neural network to establish a filter process model, and optimizing the filter operation parameters by using the model; after de-normalizing the real-time output value of the module, correcting by using the manual analysis value of the filtrate solid content in an on-line mode to obtain the soft sensing value of the filtrate solid content; and finally, carrying out real-time deduction control on the filter process according to the soft sensing value and the optimized filter operation parameters. When being used for intelligently controlling the filter operation parameters of the oxidation mother liquor in purified terephthalic acid production, the method can stabilize the filter operation, reduce the solid content of the mother liquor after the filter operation and increase the recovery rate of terephthalic acid.

Description

technical field [0001] The invention belongs to the on-line control method of chemical reaction, in particular to an on-line control method of the filtration process of oxidation mother liquor in the production of purified terephthalic acid, and the invention relates to the production of p-xylene (PX) liquid by using purified terephthalic acid (PTA) On-line control technology of p-xylene oxidation mother liquor filtration process in phase catalytic oxidation process. Background technique [0002] At present, PTA is an important raw material in the polyester industry, and is mainly used to synthesize ethylene phthalate (PET), an intermediate of polyester. Polyester is widely used in processing synthetic polyester fibers, coatings, engineering plastics, and plays a big role in production and daily life. And the main raw material of the three major synthetic fibers has the largest growth rate of PTA, which is about 3-4 times that of other raw materials. [0003] The synthesis...

AI Technical Summary

Problems solved by technology

[0011] The invention provides an on-line control method of the oxidation mother liquor filtration process in the production of purified terephthalic acid, which solves the technical problem that the PTA production process is complex and unfavorable for effective control. The method is then simulated by using the improved standard BP neural network Calculate, establish the filtration process model, and finally realize the online control of the filtration process

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