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Soft measure for polyester product quality target and process operating optimization method

A technology of product quality and soft measurement, applied in interdisciplinary fields, can solve the problems of sensitive process operation conditions, loss of online guidance, large lag, etc., and achieve the effect of improving process operation level, stabilizing product quality, and optimizing production operations

Inactive Publication Date: 2004-12-08
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

Polyester products are more sensitive to process operating conditions. The export quality indicators of esterification, pre-condensation and final polycondensation tanks: terminal carboxyl groups, viscosity and diethylene glycol content, etc., only rely on manual sampling analysis in production, with a large lag, and have lost the role of online guidance.

Method used

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  • Soft measure for polyester product quality target and process operating optimization method
  • Soft measure for polyester product quality target and process operating optimization method
  • Soft measure for polyester product quality target and process operating optimization method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] 1. Process model development

[0023] The application and development of process model technology and the improvement of automation level have reflected the high-tech connotation of the enterprise, and are also an important part of the core technology of modern industry, as well as the innovation and difficulty of the software system development. Process model development After in-depth analysis of the reactor structure, mass transfer and flow conditions, the model of the esterification, pre-condensation and final polycondensation reactors was established by combining the mechanism analysis and the actual measurement data for parameter identification. The developed models were studied by simulation. And parameter verification and online operation, the model accuracy meets the requirements of different control purposes and process analysis.

[0024] 1. Esterific...

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Abstract

A soft measuring system for in-line measurement to the quality specifications of polyester (PET) product, such as the esterified rate, terminated carboxy, viscosity, content of diglycol, etc. is disclosed. A guide software system for optimizing the operations in producing PET is also disclosed, which features that the esterified rate and viscosity and used as the control targets and a non-linear optimal algorithm is used.

Description

technical field [0001] The invention belongs to the interdisciplinary field of polymerization reaction engineering, automatic control theory, control engineering and the like, and relates to a method for modeling production process, soft measurement of polyester product quality index and process parameter operation optimization. Background technique [0002] More than 85% of petrochemical products use polymers as final products. The quality indicators of polymers (intrinsic viscosity, molecular weight distribution, etc.) determine the physical and chemical properties of products, such as a series of characteristics such as fiber formation, film formation, and high strength. It is related to the method and more dependent on the operating conditions of the process. The research on the online estimation and control method of the export quality index of the polyester production process has become the current development focus. [0003] Polyester (...

Claims

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Application Information

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IPC IPC(8): C08G63/78G01N11/00G01N33/44G05D24/00
Inventor 张素贞范文兵陶振麟王立明
Owner EAST CHINA UNIV OF SCI & TECH
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