Polymerizer

Abstract

A polymerizing reactor cooled directly by liquid ammonia for the continuous liquid-phase polyisobutene reaction features that the internal multi-layer squirrel-cage ammonia evaporator with vertical cooling tubes, the external semi-circular tube jacket type ammonia evaporator with vertical cooling tubes, and a three layers combined multifunctional stirrer are used.

Description

technical field [0001] The invention belongs to a polymerization kettle, relates to a polyisobutylene polymerization kettle, in particular to an ammonia direct cooling polymerization kettle for continuous liquid-phase isobutene polymerization reaction. Background technique [0002] At present, most of the polymerization kettles used in the field of polyisobutylene industrial production in my country are jacketed polymerization kettles, some of which have built-in cooling coils or finger tubes. The agitator used is also only suitable for liquid phase mixing systems. The cooling medium usually uses low-temperature brine or ethylene glycol aqueous solution to remove heat indirectly, and the utilization rate of cooling capacity is low. With the rapid development of polyisobutene in my country, especially high-activity polyisobutene, more stringent requirements are put forward for the heat transfer efficiency, pressure resistance level and multi-applicability o...

AI Technical Summary

Problems solved by technology

[0003] In terms of heat transfer, ordinary jackets are generally only suitable for low-pressure cooling systems due to the slow flow rate of the cooling medium, low heat transfer efficiency, and low pressure they can withstand.

Although the coiled pipe in the kettle can withstand high pressure, the flow resistance of the cooling fluid is relatively large, the heat exchange area is relatively small, and it is not conducive to the material flow pattern of the gas-liquid dispersion reaction system

The finger tube not only has a limited heat transfer area, but also has a lower pressure rating

[0004] In terms of stirrer design, the currently used stirrer can only be used in liquid mixing systems. For the production of various polyisobutenes, especially the dispersion, mixing and temperature gradient control of immiscible solution phase catalysts and gas catalysts, now Some stirring types are still difficult to meet the requirements

[0005] In terms of cooling medium, low-temperature brine or ethylene glycol aqueous solution is usually used for indirect heat removal, which not only has low cooling efficiency, high energy consumption, but also serious equipment corrosion

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