Catalyst capable of performing alcoholysis on polylactic acid and method

A polylactic acid and catalyst technology, which is applied in the field of alcoholysis polylactic acid catalysts, can solve the problems of catalytic effect to be improved, inability to biodegrade, and high cost, and achieve the effect of simple production, low cost, and improved alcoholysis rate

Active Publication Date: 2018-11-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the prior art that the catalyst used for alcohol decomposing polylactic acid is large, the cost is high, it cannot be biodegraded, and the catalytic effect needs to be improved, the present invention provides a catalyst for alcohol decomposing polylactic acid

Method used

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  • Catalyst capable of performing alcoholysis on polylactic acid and method
  • Catalyst capable of performing alcoholysis on polylactic acid and method
  • Catalyst capable of performing alcoholysis on polylactic acid and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1ChCl-Zn(OAc) 2 Preparation of deep eutectic solvent

[0020] Under the protection of nitrogen, the molar ratio of choline chloride and zinc acetate is 1:1, heat and stir at 90°C for 2 hours, until the solid mixture becomes a transparent and clear liquid, forming a deep eutectic solvent ChCl-Zn(OAc) 2 .

Embodiment 2

[0021] The selection of embodiment 2PLA alcoholysis reaction conditions

[0022] With ChCl-Zn(OAc) 2 As the catalyst, the yield of methyl lactate was selected as the standard, and the effects of reaction time, reaction temperature, catalyst dosage and methanol dosage on the experiment were analyzed by response surface analysis, and better reaction conditions were screened out.

[0023] According to the four experimental factors in Table 1 and the three-level design, 29 groups of experiments were carried out. The experimental results are shown in Table 2. The variance analysis of the experimental data in Table 2 was carried out, and the regression model variance analysis results are shown in Table 3.

[0024] Table 1 Response surface test factor level table

[0025]

[0026] Table 2 Response surface test scheme and results

[0027]

[0028] Table 3 Regression Model Analysis of Variance

[0029]

[0030] According to the estimated value of the regression coefficient,...

Embodiment 3

[0032] Embodiment 3 PLA alcoholysis reaction

[0033] Prepare a polytetrafluoroethylene liner and add magnets, add PLA with a mass of 4g, and then add ChCl-Zn(OAc) with a mass of 0.56g 2, finally add a certain amount of isopropanol, n(PLA):n(isopropanol)=7, put the lining into a high-pressure reactor with magnetic stirring and a thermometer, react at 110°C for 2h, and the reaction ends Afterwards, cool to room temperature, transfer the reaction liquid to a one-necked bottle after opening the kettle, wash the lining with a small amount of isopropanol several times, transfer it to the one-necked bottle together, and distill unreacted isopropanol under normal pressure conditions , then underpressure distillation collects liquid product (quality is 6.66g), and this product is characterized by infrared spectrum that this product is isopropyl lactate; Still residue after distillation (residue quality is 0.82g) dissolving with Virahol, can directly It can be recycled as a catalyst; ...

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Abstract

The invention belongs to an alcoholysis reaction of polylactic acid and discloses a catalyst capable of catalyzing alcoholysis of polylactic acid to recover methyl lactate and a method. The method comprises the following steps: taking a deep-eutectic solvent ChClZn(OAc)2 as a catalyst, and carrying out an alcoholysis reaction between the polylactic acid and alcohol, thereby obtaining the lactate.According to the catalyst and method provided by the invention, the alcoholysis rate of the PLA and the yield of lactate can be effectively improved, and the catalyst is simple in synthetic method, low in cost, extremely less in usage amount and favorable for industrial production.

Description

technical field [0001] The invention relates to a catalyst and a method for alcohol decomposing polylactic acid. Background technique [0002] Polylactic acid (PLA) is a polymer obtained by polymerization of lactic acid as the main raw material. The raw material source is sufficient and can be regenerated. The production process of polylactic acid is non-polluting, and the product can be biodegraded to realize the cycle in nature, so it is an ideal green polymer material. With the wide application of PLA, the amount of its production and consumption has increased dramatically, which eventually leads to the increasing accumulation of waste PLA. Although polylactic acid can be completely degraded in nature, due to the long degradation cycle, the carbon dioxide produced after degradation will pollute the air and aggravate the greenhouse effect. Therefore, not only the production research of PLA should be paid attention to, but also the degradation and recycling of PLA should b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04C07C67/03C07C69/68
CPCB01J31/04B01J2231/49C07C67/03C07C69/68
Inventor 宋修艳刘福胜胡为阅秦国辉于世涛李仕伟
Owner QINGDAO UNIV OF SCI & TECH
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