Solid state polymerization technique of polyester industry

Abstract

The invention discloses a solid phase polymerization technique of the polyester industry. The technique comprises the following steps: the pre-crystallization processing of raw materials, then on-line dust removal, recrystallization, heat transport, main reaction, discharging of machinery, cooling and dust removal to obtain a finished product. The solid phase polymerization technique adopts a reasonable technological route and technological parameters and the whole technique is provided with reasonable production equipment for the solid phase polymerization of the polyester industry, thereby realizing high output, low energy consumption, convenient quality control and regulation and stable product quality.

Description

technical field [0001] The invention relates to a solid-phase polymerization process in the polyester industry, and belongs to the technical field of solid-phase polymerization in the polyester industry. Background technique [0002] With the continuous industrialization of the polyester industry, the traditional liquid phase polymerization is far from meeting the needs of the industrialization and functional processing technology of polyester chips. into a new technical field. [0003] However, as far as the continuous solid-state polymerization technology of polyester fiber-grade high-viscosity chips is concerned, its initial development history is not long, and it has a history of less than 20 years. Countries such as Switzerland, Japan, and the United States of polymerization technology have adopted a series of measures such as closed technology and specialized equipment production, which have greatly restricted the progress and development of solid phase polymerization...

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Problems solved by technology

For example, the traditional fluidized bed crystallizer used has the problem of small production capacity, and the maximum production capacity is only 3 tons per hour; the offline cyclone separation dust collector used in dust removal, through the circulation of large air volume, the dust in the slices is brought Into an off-line cyclone separator, its dust removal capacity can not be further expanded

Since 1992, China has introduced a large number of solid-phase polymerization equipment and production technologies from the above companies, but so far there are still problems such as low output, high energy consumption, poor production stability, and unstable product quality.

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