Intelligent modeling method in industrial polyester production process

A modeling method and production process technology, applied in the field of intelligent modeling, can solve the problems of increasing the difficulty of modeling, the model cannot fully reflect the actual state of the production process, etc., and achieve the effect of accurate model

Inactive Publication Date: 2009-08-19
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the reaction in polyester is a complex polymerization reaction, it is difficult to model the industrial process of polyester
The existing polyester process modeling methods are mostly based on experimental data, and the established models cannot fully reflect the actual state of the production process.

Method used

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  • Intelligent modeling method in industrial polyester production process
  • Intelligent modeling method in industrial polyester production process
  • Intelligent modeling method in industrial polyester production process

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Such as image 3 As shown, the modeling method of the polyester production process mechanism model includes the following steps:

[0024] Step 1. Collection and processing of industrial data.

[0025] Collect real-time and historical data of industrial reactors, including reactor temperature, pressure, liquid level, feed amount, feed composition, composition of gas phase products, flow rate of gas phase products, composition of liquid phase products, flow rate, liquid phase polymer Intrinsic viscosity, carboxyl end concentration. For factories equipped with distributed control systems, production data such as temperature and pressure are generally collected in seconds, and quality data such as carboxyl-terminal concentration and intrinsic viscosity of products are generally analyzed every 8 hours. The data of 2 hours before and after the analy...

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Abstract

The invention relates to an intelligent modeling method during the industrial polyester production process. Firstly, a mechanism model of the polyester production process based on reaction kinetics is established according to the mechanism of polyester reaction process; and then, parameters in the technical mechanism model are optimized by a multiple-target distribution estimation algorithm, so as to describe the actual operation characteristic of the industrial polyester production process exactly. At the same time, considering the influence on the reaction during the pre-polycondensation stage caused by catalyst, influence factor of the catalyst is added in reaction speed constant of the mechanism model, and a model between the catalyst and the reaction speed constant is established by a least square method; in a final polycondensation reactor, the mass transfer rate is reduced, and the influence on the process speed is increased, so that an artificial neural network is used for establishing an empirical model while the influence of mass transfer is considered, and the process speed is expressed in a form of resistance equation while combining with the reaction speed to ensure that the model is exacter. The modeling method can be applied to the modeling during three-reaction and five-reaction technical process during the industrial polyester production process at present.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering and relates to an intelligent modeling method for the production process of an industrial device for direct esterification of ethylene glycol and terephthalic acid to synthesize polyester. Background technique [0002] Polyester is a raw material for the manufacture of polyester fibers, coatings, films, and engineering plastics. It is usually a polymer condensation product obtained by esterification and polycondensation of dibasic acids and diols. Each chain of its macromolecules The internodes are linked by ester groups. The manufacturing process of polyester can be roughly divided into two stages. The first stage is to prepare terephthalic acid (TerePhthalic Acid, TPA for short) from basic raw materials such as p-xylene (Para-Xylene, PX for short), toluene, phthalic anhydride, etc.; Alcohol (Ethylene glycol, referred to as EG) is esterified to produce polyester monomer bishydroxyet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78
Inventor 钱锋罗娜赵玲杜文莉
Owner EAST CHINA UNIV OF SCI & TECH
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