Alcoholysis method for liquid lewis acid catalyst to catalyze waste polylactide material

A polylactic acid material, Lewis acid technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve equipment corrosion and waste water discharge, catalyst can not be repeated Reuse, prone to dehydration side reactions and other problems, to reduce waste water discharge, inhibit dehydration and other side reactions, and overcome the effects of large catalyst consumption

Active Publication Date: 2015-11-04
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for alcoholysis of waste PLA to overcome the traditional methods that consume a large amount of traditional strong acid and strong alkali, the catalyst cannot be reused or the repeated reuse process is complicated to operate, equipment corrosion and waste water discharge are many , prone to dehydration side reactions and other disadvantages

Method used

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  • Alcoholysis method for liquid lewis acid catalyst to catalyze waste polylactide material
  • Alcoholysis method for liquid lewis acid catalyst to catalyze waste polylactide material
  • Alcoholysis method for liquid lewis acid catalyst to catalyze waste polylactide material

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Embodiment 1

[0020] Embodiment 1: waste PLA and 1-butyl-3-methylimidazole ferric chloride are added to the autoclave according to the mol ratio of 1:0.0025, and then the ratio of 5:1 according to the mol ratio of methanol and PLA A metered amount of methanol was added, and the reaction was stirred at 110 °C for 3 h. The PLA alcoholysis rate was 99.3%, and the methyl lactate selectivity was 99.5%.

Embodiment 2

[0021] Embodiment 2: The implementation conditions and steps are the same as in case 1, except that 1-butyl-3-methylimidazolium chloroferric acid salt is changed to 1-butyl-3-methylimidazolium chloride zinc salt, and the reaction temperature is changed to At 70℃, the alcoholysis rate of PLA was 89.8%, and the selectivity of methyl lactate was 99.7%.

Embodiment 3

[0022] Example 3: The implementation conditions and steps are the same as in implementation case 1, except that 1-butyl-3-methylimidazolium chloroferric acid salt is changed to 1-butyl-3-methylimidazolium chlorostannous acid salt, and the PLA alcoholysis rate is was 99.2%, and the methyl lactate selectivity was 99.4%.

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Abstract

The present invention relates to a novel method for chemical depolymerization of a waste polylactide material to prepare lactic acid alkyl ester so as to chemically recycle the waste polylactide material. The method is characterized by using a highly catalytic liquid lewis acid that can be easily separated for recycling and reused, such as 1-alkyl-3 amino methyl imidazolium chloride ferrite, as a catalyst; performing an alcoholysis reaction at the temperature of 70 to 120 DEG C. After the reaction, obtaining lactic acid alkyl ester by performing distillation and other operations. The catalyst that is recycled can be directly reused without any processing. The method in the present invention, compared to a traditional method, has the following features: (1) using of traditional strong acid and alkali of the background technology is not needed, thereby significantly solving the problems of equipment corrosion and sewage discharge; and (2) the catalyst has such properties as high catalytic activity, good selectivity, low dosage and is easy to be separated for recycling and reused.

Description

【Technical field】 [0001] The invention relates to a new method for recovering alkyl lactate by chemically depolymerizing waste polylactic acid (PLA) materials by using liquid Lewis acid as a catalyst. 【Background technique】 [0002] PLA is an excellent biomass-based thermoplastic polymer material with good biocompatibility and biodegradability. It is a potential substitute for petroleum-based polymers such as polyester and polystyrene, and can be widely used in Industry, packaging and pharmaceutical industries. In recent years, with the increasing scarcity of petroleum resources and the continuous development of PLA production technology, the production and consumption of PLA have grown rapidly. The rapid increase in PLA production and sales will lead to more and more waste PLA. Although PLA can be degraded under natural conditions, the degradation cycle is too long, and waste stacking or landfill will occupy space and pollute the environment; in addition, its degradation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C07C69/68B01J31/02
CPCY02P20/584C07C67/03B01J31/0284
Inventor 刘福胜宋修艳刘会晴于世涛刘仕伟
Owner QINGDAO UNIV OF SCI & TECH
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