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Catalyst and method for alcoholysis of polycarbonate

A technology of polycarbonate and catalyst, which is applied in the field of polycarbonate alcoholysis reaction, can solve the problems such as the catalytic effect needs to be improved, the amount of catalyst used is large, and cannot be biodegraded, and the effect of simple production, simple synthesis method and low cost can be achieved

Active Publication Date: 2020-03-31
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems in the prior art that the amount of catalyst used for alcoholysis polycarbonate 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 alcoholysis polycarbonate

Method used

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  • Catalyst and method for alcoholysis of polycarbonate
  • Catalyst and method for alcoholysis of polycarbonate
  • Catalyst and method for alcoholysis of polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of embodiment 1[EMIMOH]Cl-nUrea deep eutectic solvent

[0021] Preparation of N-methylimidazole precursor Add N-methylimidazole and 2-chloroethanol at a molar ratio of 1:1 to a three-necked flask successively, heat to reflux under nitrogen atmosphere, stir for 48 hours, and cool naturally to room temperature. A large amount of white precipitate appeared at the bottom, and the white precipitate was filtered with a Buchner funnel, washed several times with ethyl acetate, and the resulting white precipitate was dried in a vacuum oven at 80°C for 8 hours to obtain a white N-methylimidazole precursor.

[0022] Preparation of [EMIMOH]Cl-nUrea deep eutectic solvent Take the above-mentioned N-methylimidazole precursor and urea with a molar ratio of 1:2, add them to a 100ml single-necked bottle, and heat and stir at 90°C for 2h under a nitrogen atmosphere. Until the colorless transparent clear liquid generates [EMIMOH]Cl-2Urea.

Embodiment 2

[0023] The preparation of embodiment 2[EMIMOH]Cl-nUrea deep eutectic solvent

[0024] Preparation of N-methylimidazole precursor Add N-methylimidazole and 2-chloroethanol at a molar ratio of 1:1 to a three-necked flask successively, heat to reflux under nitrogen atmosphere, stir for 48 hours, and cool naturally to room temperature. A large amount of white precipitate appeared at the bottom, and the white precipitate was filtered with a Buchner funnel, washed several times with ethyl acetate, and the resulting white precipitate was dried in a vacuum oven at 80°C for 8 hours to obtain a white N-methylimidazole precursor.

[0025] Preparation of [EMIMOH]Cl-nUrea deep eutectic solvent Take the above-mentioned N-methylimidazole precursor and urea with a molar ratio of 1:5, add them to a 100ml single-necked bottle, and heat and stir at 90°C for 2h under a nitrogen atmosphere. Until the colorless transparent clear liquid generates [EMIMOH]Cl-5Urea.

Embodiment 3

[0026] The influence of the proportioning of embodiment 3 [EMIMOH]Cl-nUrea on PC alcoholysis reaction

[0027] In an autoclave with a thermometer, 4 g of waste PC, 0.4 g of [EMIMOH]Cl-nUrea in Table 1, and 2.5 g of methanol were sequentially added, and the reaction was stirred at 120°C for 2 hours. The PC residue of the reaction, the filtrate was distilled under reduced pressure first, and then ethyl acetate and deionized water were added to extract and separate the liquid. Obtain corresponding product BPA after pressure distillation, the yield of corresponding product BPA and PC degradation rate are as shown in table 1.

[0028]Table 1 Effect of the ratio of choline chloride DES on the alcoholysis reaction of PC

[0029]

[0030] The data in Table 1 show that the molar ratio of [EMIMOH]Cl to Urea is 1:1 to 1:5, which has a good catalytic effect on the methanolysis reaction of PC, and the degradation rate of PC can reach 100%, but [ EMIMOH]Cl-2Urea has a better catalytic ...

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Abstract

The invention belongs to alcoholysis reaction of PC (polycarbonate) and discloses a catalyst and a method for catalyzing alcoholysis of PC to recover BPA (bisphenol A). According to the method, a [EMIMOH]Cl-nUrea deep-eutectic solvent is taken as a catalyst, reactant PC and alcohol are subjected to the alcoholysis reaction, and BPA is generated. According to the catalyst and the method, the alcoholysis rate of PC and the yield of BPA can be effectively increased, the synthesis method of the catalyst is simple, the cost is low, consumption is low, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the alcoholysis reaction of polycarbonate, in particular to a catalyst and a method for catalyzing the alcoholysis of polycarbonate to recover bisphenol A. Background technique [0002] Polycarbonate (PC) is a high molecular polymer with carbonate groups in its molecular chain. Due to the special structure of polycarbonate, it has become the fastest growing general engineering plastic among the five engineering plastics. With the rapid increase in the production and sales of PC materials, more and more waste PCs are produced. Although waste PC itself is not very toxic, due to its bulky size, it degrades slowly under natural conditions, which not only occupies space and pollutes the environment, but also is a huge waste of resources. Therefore, the recycling of waste PCs has been paid more and more attention by people. Currently, the reported chemical recycling methods are mainly divided into thermal cracking and chemical depo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C07C37/055C07C39/16
CPCB01J31/0249C07C37/0555C07C39/16
Inventor 刘福胜宋修艳胡为阅秦国辉于世涛刘仕伟
Owner QINGDAO UNIV OF SCI & TECH
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