Propylene polymerization production technology by loop reactor batch liquid bulk method

Abstract

The invention relates to a propylene polymerization production technology by a loop reactor batch liquid bulk method. With combination of a loop reactor and a batch liquid bulk reaction vessel, materials cycle between the loop reactor and the batch liquid bulk reaction vessel by an axial-flow pump of the loop reactor or with the addition of a pump, thus solving poor heat removing performance of the batch liquid bulk reaction vessel, controlling the pressure of the batch liquid bulk reaction vessel to be higher than the saturation pressure of the materials in the loop reactor, maintaining completely full state of the loop reactor and stabilizing the reaction pressure. In comparison with present production technologies, according to the invention, a reactor vacuum tank is canceled, the production capacity of devices is expanded, the utilization rate of a catalyst is raised, and a plurality of functions of production equipment is fully performed. The improved process is simple and easy to operate and the construction cycle is short; therefore, the production technology provided by the invention has a great economic benefit.

Description

technical field [0001] The invention proposes a method for improving the process of producing polypropylene by the liquid-phase bulk method of the loop reactor, and adopts the combination mode of the interconnection of the loop reactor and the liquid-phase bulk kettle to expand the production capacity of the device, improve the utilization rate of the catalyst, and increase the product purpose of the grade. The invention belongs to the field of olefin polymerization. technical background [0002] In the polymerization section of polypropylene produced by the liquid-phase bulk method in the loop reactor, the liquid propylene monomer transported from the propylene storage tank enters the prepolymerization reactor and the loop reactor respectively. The catalyst system enters the prepolymerization reactor, and the prepolymerized material is reactive and enters the loop reactor; finally, the product material is continuously discharged from the loop reactor and enters the polymer...

AI Technical Summary

Problems solved by technology

However, the products of the single-loop polypropylene plant are relatively single, and it is difficult to produce polypropylene products with a wide molecular weight distribution.

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