Polymeric kettle and thermal withdrawal mode thereof

Abstract

The invention discloses a polymeric kettle and a thermal withdrawal mode thereof. The polymeric kettle comprises a kettle body and a stirrer arranged in the kettle body, an outer cycle condensing system used for enhancing thermal withdrawal of the polymeric kettle is also arranged outside the kettle body, the volume of the kettle body is 12m<3> to 70m<3>, and the height-diameter ratio of the kettle body is 2 to 3. The thermal withdrawal mode comprises the following steps: propylene steam released from a gas outlet of the upper end of the polymeric kettle is condensed by the outer cycle condensing system at the outer side of the polymeric kettle; and the condensed liquid phase and gas phase flow back to the polymeric kettle under the action of the deadweight and the circulating fan. The invention utilizes the outer cycle condensing system to solve the problems of large scale of the polymeric kettle and insufficient thermal withdrawal capacity for producing copolymer polypropylene in a batch bulk method, the large scale of the polymeric kettle is ensured to be viable, single kettle output and product quality are both enhanced, the stirring and thermal withdrawal properties of the polymeric kettle are enhanced, the production capacity of the polymeric kettle, the single kettle output and the product quality are all greatly enhanced, the production capacity is especially enhanced when an efficient catalyst is used, and product added value and economic benefits are increased.

Description

technical field [0001] The invention relates to an intermittent liquid-phase bulk method polypropylene polymerization kettle and its external circulation heat removal method. Background technique [0002] Domestic intermittent liquid-phase bulk polypropylene (referred to as small bulk polypropylene) technology development has a history of more than 30 years, the initial selection of 4m 3 polymerization kettle, gradually developed to 12m 3 The polymerization kettle, basically eliminated the 4m 3 The polymerization kettle has become a commonly used mode. In order to further increase the production capacity of a single kettle, a 15m 3 polymerizers, but all ended in failure, so there is no such type of polymerizers at present. Since 2002, Baling Petrochemical has developed 20m 3 The advanced polymerization kettle has been improved many times and can basically operate normally, but because there are still lumps in the kettle, the promotion is slow. [0003] There have been ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a kind of polymerization that can not only improve the stirring and heat removal performance of the polymerization kettle, but also can improve the production capacity of the polymerization kettle, especially the production capacity when the high-efficiency catalyst is used. Kettle and its heat removal method to solve the problem of large-scale polymerization kettle and insufficient heat removal capacity, greatly shortening the reaction time and improving production efficiency

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