Self-cleaning polymerization reactor

Abstract

The invention relates to a self-cleaning polymerization reactor, which comprises a hermetic horizontal cylinder, wherein the cross section of the horizontal cylinder has a double circle shape; two main shafts are arranged in the cylinder, and are positioned in two centers of the double circles respectively; the main shafts are provided with a plurality of star rotors; each star rotor consists of a disc body and a hub in the center of the disc body; the disc body is provided with a plurality of spokes; the hub is sleeved on the main shaft; dynamic input ends of the two main shafts extend out of the horizontal cylinder, and are respectively connected with a drive device which is used for driving the two main shafts to rotate synchronously and reversely; the number of the spokes on the rotor is preferably 3; and the spokes are provided with a straight scraper or a scraper with a helical angle. When the reactor works, the spokes on the star rotors stir materials, and can continuously destroy and scrape remaining layers attached to the inner wall of the cylinder and the surfaces of the main shafts. The self-cleaning polymerization reactor is mainly used for the polymerization reaction of polylactic acid (PLA) and other polyesters.

Description

technical field [0001] The invention relates to a self-cleaning polymerization reactor, which is mainly used for the polymerization reaction of polylactic acid (PLA) and other kinds of polyesters. Background technique [0002] PLA's raw material lactic acid (LA) comes from crops or non-grain crops. In the two-step PLA preparation process, lactic acid is first synthesized into lactide, and then high molecular weight PLA is obtained by ring-opening polymerization of lactide. The formed PLA is Degradable fibers or plastics belong to the fourth generation of new materials. At present, some developed countries in the world have carried out corresponding product development, but industrial production has only been realized in the United States. Since the raw material of PLA is renewable and the product is degradable, it can partially replace petroleum-based plastics and fibers, so it has great prospects for promotion and application and is of strategic significance. [0003] The ...

AI Technical Summary

Problems solved by technology

When the degree of polymerization is small, the viscosity is low, the fluidity of the material is good, and the mixing is easy. Using a uniaxial disc reactor for stirring is sufficient to meet the process requirements, but as the degree of polymerization increases, the viscosity increases and the fluidity becomes poor. The stagnant layer attached to the wall is thickened, and at the same time, there will be polymer accumulation on the surface of the main shaft, which will degrade after a long time, and will affect the quality of the product after falling off. The existing polymerization reactors have not solved these problems well.

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