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Polymerization reaction device for preparing polylactic acid

A technology of polymerization reaction and polylactic acid, which is applied in the field of polymerization reaction device for the preparation of polylactic acid, can solve the problems of large stirring kinetic energy, complicated granulation process, difficulty in removing non-polymer monomers, etc., achieve uniform distribution of temperature field, reduce The effect of the granulation process

Inactive Publication Date: 2011-12-21
ZHEJIANG BOSHUOBEI BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Polymerization reaction device for preparing polylactic acid
  • Polymerization reaction device for preparing polylactic acid
  • Polymerization reaction device for preparing polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The polymerization reaction device used to prepare polylactic acid in this embodiment is as follows: figure 1 and Figure 1A As shown, a housing 1 is included, and the inner cavity of the housing 1 constitutes a sealed reaction chamber 2 . A feed port 5 communicating with the reaction chamber 2 is provided on the upper surface of the housing 1, and an air suction port 6 communicating with the reaction chamber 2 is provided on the top of the housing 1, and the outer end of the air extraction port 6 is connected to a vacuum pump. An air inlet 7 communicating with the reaction chamber 2 is provided on the side wall or bottom of the housing 1 , and the outer end of the air inlet 7 is connected to a gas source. A discharge port 8 communicating with the reaction chamber 2 is provided at the bottom of the housing 1 .

[0029] When the air inlet 7 is closed and the gas extraction port 6 is working, the reaction chamber 2 can be in a high vacuum state. The outer end of the ga...

Embodiment 2

[0038] Preferred embodiments of the present invention are figure 2 As shown, the casing 1 in this embodiment is composed of an inner casing 1a and an outer casing 1b. Between the inner shell 1a and the outer shell 1b is formed a sealed interlayer 1c through which a heating medium or a cooling medium flows. The inside of the inner shell 1a constitutes a sealed reaction chamber 2 . One side of the outer casing 1b is provided with an inlet 3 communicating with the sealed partition 1c. The inlet 3 is used to feed refrigerant or heat medium into the sealed partition 1c to control the temperature condition of the reaction chamber 2. On the upper part corresponding to the other side of the outer shell 1b, an outlet 4 communicating with the sealed compartment 1c is provided. The inlet 3 and the outlet 4 are arranged diagonally to facilitate convection of the refrigerant or heat medium in the sealed compartment 1c.

[0039] A feed port 5 communicating with the reaction chamber 2 is ...

Embodiment 3

[0046] Another preferred embodiment of the present invention is Figure 4 As shown, the housing of the polymerization reaction device in this embodiment is detachably and hermetically connected by an upper part housing and a lower part housing through threads. The upper part of the shell and the lower part of the shell are respectively made with a sealing partition 1c composed of an inner shell 1a and an outer shell 1b. The inner casing 1 a of the upper part casing and the inner casing 1 a of the lower part casing form a sealed reaction chamber 2 . The sealing interlayer 1c of the upper part of the housing is provided with a first introduction port 3a and a first outlet 4a arranged diagonally with the first introduction port 3a; the sealing interlayer 1c of the lower part of the housing is provided with a second An inlet 3b and a second outlet 4b arranged diagonally to the second inlet 3b.

[0047] A feed port 5 communicating with the reaction chamber 2 is provided on the up...

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Abstract

The invention discloses a polymerization reaction device for preparing polylactic acid which can combine the polymerization and granulation processes together. The upper part of the housing is provided with a suction port, the side wall or bottom of the housing is provided with an air inlet, and the bottom of the housing is provided with a discharge port; the reaction chamber is fixed in sequence from top to bottom with a plurality of polymer plates, polymer plates There are multiple concave holes on the upper surface of the polymer board; each polymer board is inclined, and the two adjacent polymer boards are inclined in the opposite direction. The high end of the polymer board is the receiving end for the upper material, and the low end of the polymer board is for conveying the material downward. There is a gap between the delivery end and the inner wall of the inner shell; the lower part of the delivery end of the adjacent previous aggregate plate corresponds to the receiving end of the next adjacent aggregate 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/06C08G63/78
Inventor 杨名冯璐杨凯敏俞惠菊
Owner ZHEJIANG BOSHUOBEI BIOLOGICAL TECH
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