Method for online soft measurement of ethylene content in co-polypropylene resin

Abstract

The invention discloses a method for online soft measurement of ethylene content in co-polypropylene resin. The online soft measurement of the ethylene content in the co-polypropylene resin is realized by clicking a button on a configuration interface of an industrial personal computer to start an ethylene content online soft measurement program which is compiled in advance, and combining with a recursive extended least square based on a dynamical mathematic model of ethylene content in a polypropylene full-flow process. The method disclosed by the invention is mostly characterized in that under the continuous production state of a polymerization device, the ratio of propylene concentration and ethylene concentration is measured on line only, so that the online soft measurement of the ethylene content in the co-polypropylene resin can be realized within a quite wide range, the method has the advantages of simplicity, convenience, effectiveness, convenience in implementation, low cost and the like, and can be used for greatly increasing the frequency and efficiency of detecting the critical quality of polypropylene, reducing the discharge of rejected products and increasing the economic benefits and the market competitiveness.

Description

technical field [0001] The invention relates to an online soft measurement design method for the ethylene content of a copolymerized polypropylene resin. Background technique [0002] Copolymerized polypropylene (including random copolymerized polypropylene and impact copolymerized polypropylene) is a general-purpose synthetic resin material polymerized from two or more monomers, and is a high-end brand product among polypropylene resins. In copolymerized polypropylene resin products, ethylene content is a key quality index, which is usually strictly controlled by manual sampling and testing every 12 hours in industrial production. However, in order to improve the quality of copolymerized polypropylene products and the economic benefits of the enterprise, the polymerization unit needs to realize on-line monitoring of product quality, that is, on-line measurement and control of ethylene content. However, as a multi-input and multi-output strongly nonlinear production process...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing on-line measurement method of ethylene content of copolymerized polypropylene, which are complex in operation, difficult to put into operation online, and poor in practicability, the present invention provides a ethylene content measurement method of copolymerized polypropylene resin with simple design, easy on-line put into operation, and strong practicability. Online Soft Sensing Method

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