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Lactic acid oligomer synthesis system capable of regulating and controlling polymerization degree and synthesis method thereof

A technology of lactic acid oligomer and synthesis method, applied in the field of biodegradable material production, can solve problems such as wide distribution of polymerization degree of lactic acid oligomer, and achieve the effect of solving wide distribution of polymerization degree, concentrated degree of polymerization, and optimizing reaction route

Active Publication Date: 2021-10-01
江苏科富恺机械设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then, the problem of wide distribution of the polymerization degree of lactic acid oligomers in the prior art is better solved by adjusting side line extraction and tower top extraction, providing high-quality raw materials for subsequent depolymerization reactions, and overcoming existing problems. There are deficiencies in technology

Method used

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  • Lactic acid oligomer synthesis system capable of regulating and controlling polymerization degree and synthesis method thereof
  • Lactic acid oligomer synthesis system capable of regulating and controlling polymerization degree and synthesis method thereof
  • Lactic acid oligomer synthesis system capable of regulating and controlling polymerization degree and synthesis method thereof

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preparation example Construction

[0050] The present invention also includes a method for synthesizing lactic acid oligomers that can regulate the degree of polymerization, which includes the following steps:

[0051] S1. Send the raw material lactic acid into the first reaction rectification tower 1 for polycondensation reaction and rectification separation. The working pressure is 5-30KPaA, the reaction temperature is 100-170°C, and the residence time is 1-4h to obtain the first light group and the first heavy component, the first light component is discharged into the first condensation system, and the first heavy component is sent into the second reactive distillation column 2 through the first tower still extraction pipe 3;

[0052] S2. The second reactive distillation tower 2 performs polycondensation reaction and rectification separation on the first heavy component, the working pressure is 0.1-5.0KPaA, the reaction temperature is 160-190°C, and the residence time is 1-4h to obtain the second light compo...

Embodiment 2

[0063] The synthesis method and system used in this example are the same as in Example 1, except that the operating temperature of the materials in the first reactive distillation column is 155°C, and the operating temperature of the second reactive distillation column is 180°C.

[0064] The degree of polymerization distribution rate of the target product obtained in this example is as follows: the degree of polymerization accounts for 9% in the interval of 0-5, the proportion of degree of polymerization in the interval of 6-10 accounts for 18%, and the degree of polymerization in the interval of 11-15 The proportion is 24%, the proportion of the degree of polymerization in the range of 16-20 is 29%, the proportion of the degree of polymerization in the range of 21-25 is 10%, the proportion of the degree of polymerization in the range of 26-30 is 6%, the proportion of the degree of polymerization is In the range of 31-35, the proportion is 3%, and in the range of the degree of ...

Embodiment 3

[0066] The synthesis method and system used in this example are the same as in Example 1, except that the operating temperature of the materials in the first reactive distillation column is 165°C, and the operating temperature of the second reactive distillation column is 190°C.

[0067] The degree of polymerization distribution rate of the target product obtained in this example is as follows: the degree of polymerization accounts for 2% in the interval of 0-5, the proportion of degree of polymerization in the interval of 6-10 is 3%, and the degree of polymerization in the interval of 11-15 The proportion is 13%, the proportion of the degree of polymerization in the range of 16-20 is 26%, the proportion of the degree of polymerization in the range of 21-25 is 28%, the proportion of the degree of polymerization in the range of 26-30 is 17%, the proportion of the degree of polymerization is 7% in the range of 31-35, and 4% in the range of aggregation degree greater than 35. The ...

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Abstract

The invention discloses a lactic acid oligomer synthesis system capable of regulating and controlling the polymerization degree and a synthesis method thereof. The system is characterized in that a tower kettle outlet of a first reactive rectification tower is communicated with a feeding hole of a second reactive rectification tower through a first tower kettle extraction pipe; a side line discharge port of the second reactive distillation tower is communicated with a reflux system, and a tower kettle outlet is communicated with a second tower kettle extraction pipe; the reflux system comprises a first condenser, an inlet of the first condenser is communicated with a side line discharge hole of the second reactive distillation tower, and an outlet of the first condenser is respectively communicated with a tower kettle reflux inlet of the first reactive rectification tower and a tower top reflux inlet of the second reactive rectification tower through pipelines. Free water is removed and the lactic acid oligomer intermediate is generated through the first reactive rectification tower, and the water and the lactic acid oligomer intermediate generated by the reaction are removed through the second reactive rectification tower, so that the lactic acid oligomer with relatively concentrated polymerization degree distribution is obtained, the problem of wide polymerization degree distribution of the lactic acid oligomer is solved, and a high-quality raw material is provided for subsequent depolymerization reaction.

Description

technical field [0001] The invention relates to the technical field of production of biodegradable materials, in particular to a synthesis system and method for lactic acid oligomers with adjustable polymerization degree. Background technique [0002] Lactic acid oligomer is an intermediate in the synthesis of lactide and a precursor of polylactic acid, a biodegradable biomaterial. It is an important link in the current production process of polylactic acid. Since lactide does not produce water as a by-product when the ring-opening polymerization reaction produces polylactic acid, the degree of polymerization of the polymerization reaction can be precisely controlled. Therefore, it is currently the most important technology to produce polylactic acid from lactide purified by dehydration polycondensation and depolymerization of lactic acid. More advanced technology. At the same time, the purity of lactide also directly affects the degree of polymerization of polylactic acid ...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/78
CPCC08G63/08C08G63/785Y02P20/10
Inventor 王翀税欣郭一鹏敖平
Owner 江苏科富恺机械设备有限公司
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