Polyreaction device for preparing polylactic acid

Abstract

The invention discloses a polyreaction device for preparing polylactic acid, which is capable of combining an aggregation process and a granulation process. The polyreaction device comprises a shell which can form a seal reaction chamber, wherein the upper end surface of the shell is provided with a feeding hole, the upper part of the shell is provided with a pumping hole, the side wall or the bottom of the shell is provided with an air inlet, the bottom of the shell is provided with a discharging hole, a plurality of polymerization plates are arranged in the reaction chamber from top to bottom, the upper surfaces of the polymerization plates are provided with a plurality of concave holes, the polymerization plates are arranged in a sloping mode, the sloping directions of the two adjacentupper and lower polymerization plates are opposite, the high ends of the polymerization plates are bearing ends which are used for bearing upper materials, the bottom ends of the polymerization platesare transporting ends which are used for transporting materials downwards, a gap is arranged between the transporting end and the inner wall of an inner layer shell, and the lower part of the transporting end of the adjacent last polymerization plate corresponds to the bearing end of the next adjacent polymerization plate.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid polymerization reaction devices, in particular to a polymerization reaction device for preparing polylactic acid. Background technique [0002] Polylactic acid is a new synthetic polymer material with excellent biocompatibility and biodegradability, and it is considered to be one of the most promising polymer materials in the 21st century. In 2002, the United States officially started the industrial production of polylactic acid, and then Japan, Germany and other countries competed to start the industrial production of polylactic acid for different purposes. At present, my country is also accelerating the development and application of polylactic acid, but its industrial production is still a problem in our country. [0003] At present, common polymerization reaction devices include vertical vertical stirring reactor, bedroom horizontal stirring reactor, vertical scraper film evaporation ...

AI Technical Summary

Problems solved by technology

However, these reactors have different degrees of deficiencies, 1. It needs to consume a large amount of stirring kinetic energy; 2. It is difficult to seal; 3. The temperature distribution in the reactor is uneven; 4. It is difficult to remove non-polymers during the reaction process. Monomer; 5. After the polymerization reaction, a series of tedious granulation process is required

[0004] Since the polymerization reaction time of polylactic acid is relatively longer than other polymer materials, and there are more non-polymerizable monomers in the polymer, the granulation process after polymerization is cumbersome, so the above four reactors have no advantages.

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