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Recrystallization purifying device for lactide

A purification device and recrystallization technology, applied in solution crystallization, organic chemistry and other directions, can solve the problems of mixing impurities, difficulty in industrial production of lactide recrystallization, etc., and achieve the effect of improving crystal purity

Inactive Publication Date: 2012-07-04
ZHEJIANG BOSHUOBEI BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the industrial production of lactide recrystallization is relatively difficult at present, mainly because the formation of lactide is accompanied by a large number of side reactions, and the removal of impurities generated by side reactions requires a certain process flow
In the process of removing impurities, the existing process is in an open environment, and other impurities are mixed in

Method used

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  • Recrystallization purifying device for lactide
  • Recrystallization purifying device for lactide
  • Recrystallization purifying device for lactide

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, this embodiment is used for the recrystallization and purification device of lactide, which includes a tank body 2 supported by a rotating shaft 1 and capable of rotating around the rotating shaft 1 . The inner cavity of the tank body 2 constitutes a recrystallization chamber 3, and a filter plate 4 is arranged on the inner wall of the tank body 2 to divide the recrystallization chamber 3 into an upper recrystallization chamber 3a and a lower recrystallization chamber 3b. The mesh number of the filter plate 4 is between 200 mesh and 400 mesh, it is the best to not pass the lactide crystal, but the solvent can pass quickly. The tank body 2 is composed of upper and lower parts that are detachably sealed and connected, and the filter plate 4 can be replaced when the upper and lower parts are disassembled.

[0029] A recrystallization solvent inlet 5 and a suction outlet 6 are provided in the upper recrystallization chamber 3a. The pumping port ...

Embodiment 2

[0034] Embodiment 2 is a preferred embodiment of the present invention, as image 3 with Figure 4 As shown, the recrystallization purification device for lactide includes a tank body 2 supported by a rotating shaft 1 and capable of rotating around the rotating shaft 1. The tank body 2 is an oval tank body, and its inner cavity constitutes a recrystallization chamber 3. A filter plate 4 is provided on the inner wall of the tank body 2 to divide the recrystallization chamber 3 into an upper recrystallization chamber 3a and a lower recrystallization chamber 3b. The filter plate 4 is arranged in the middle of the recrystallization chamber 3 , and the rotating shaft 1 is fixed in the middle of the tank body 2 . The 4 mesh of the filter plate is 200 mesh to 400 mesh. The tank body 2 is composed of upper and lower parts that are detachably sealed and connected, and the filter plate 4 can be replaced when the upper and lower parts are disassembled.

[0035] A recrystallization sol...

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Abstract

The invention provides a recrystallization purifying device for lactide, which has the advantages of seal operation, high recrystallization purity, economic and efficient running, and the like and mainly comprises a tank body, wherein the tank body is supported by a rotating shaft and can rotate along the rotating shaft; an inner cavity of the tank body is formed a recrystallization chamber; the inner wall of the tank body is provided with a filter plate for dividing the recrystallization chamber into an upper recrystallization chamber and a lower recrystallization chamber; the upper recrystallization chamber is provided with a recrystallization solvent inlet and a drawing outlet; the lower recrystallization chamber is provided with a lactide inlet and a lactide outlet; a heat preservation sleeve filled with cooling and heating media is fixed on the outer wall of the tank body at the outer side of the lower recrystallization chamber and provided with a cooling and heating media inlet and a cooling and heating media outlet. The whole pumping filter process is carried out in a seal or vacuum environment and has no stirring and mechanical power in running, the recrystallized liquid is uniformly mixed fully in a cavity body without residual undissolved lactide crystals, and the recrystallization purification is more complete.

Description

technical field [0001] The invention belongs to the technical field of crystal recrystallization purification devices, in particular to a recrystallization purification device for lactide. Background technique [0002] Lactide is the precursor of polylactic acid. Lactide ring-opening synthesis of polylactic acid is a traditional classic method. Compared with other synthetic methods, ring-opening polymerization has the advantages of high molecular weight and high yield. High molecular weight polylactic acid is usually obtained by ring-opening polymerization of high-purity lactide. Usually, lactide is obtained from aqueous lactic acid through low molecular weight polylactic acid as an intermediate, and then by cracking. However, the generally obtained lactide contains a small amount of impurities such as lactic acid monomer, lactic acid dimer and water. [0003] These impurities will have an adverse effect on the polymerization of lactide. For example, the presence of water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D319/12B01D9/02
Inventor 杨名冯璐杨凯敏俞惠菊
Owner ZHEJIANG BOSHUOBEI BIOLOGICAL TECH
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