Ternary catalyst for preparing fatty group polycarbonate

A three-way catalyst and polycarbonate technology, applied in the field of catalysts, can solve problems such as catalyst removal and separation that are not involved in the catalytic efficiency of polycarbonate, and achieve the effects of low cost and simple preparation method

Inactive Publication Date: 2010-02-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method provides a three-way catalyst for industrial production, it does not involve the catalytic efficiency of polycarbonate and the removal and separation of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add glycerin and diethylzinc to tetrahydrofuran, and age at 40°C for 4 hours under the protection of nitrogen atmosphere to obtain a suspension solution; then add lanthanum borohydride to tetrahydrofuran to obtain a solution, and then add this solution to the above suspension solution , aged at 40° C. for 4 hours under the protection of a nitrogen atmosphere to obtain a white three-way catalyst suspension solution, wherein the molar ratio of lanthanum borohydride, diethyl zinc, and glycerin was 1:20:10.

[0025] Add the prepared three-way catalyst suspension solution and propylene oxide into the autoclave respectively, fill with carbon dioxide, maintain the pressure at 3Mpa, react at 60°C for 6 hours, terminate with 50ml of methanol, and obtain a white solid in dilute hydrochloric acid solution After soaking for 12 hours, it was dissolved in dichloromethane, and then precipitated with methanol to obtain a white polycarbonate solid. The number average molecular weight of ...

Embodiment 2

[0027] Add glycerin and diethylzinc to tetrahydrofuran, and age at 80°C for 2 hours under the protection of nitrogen atmosphere to obtain a suspension solution; then add yttrium borohydride to tetrahydrofuran to obtain a solution, and then add this solution to the above suspension solution , Aged at 80° C. for 2 hours under the protection of nitrogen atmosphere to obtain a white three-way catalyst suspension solution, wherein the molar ratio of yttrium borohydride, diethyl zinc, and glycerin was 1:20:10.

[0028] Add the prepared three-way catalyst suspension solution and propylene oxide into the autoclave respectively, fill with carbon dioxide, maintain the pressure at 3Mpa, react at 60°C for 6 hours, terminate with 50ml of methanol, and obtain a white solid in dilute hydrochloric acid solution After soaking for 12 hours, it was dissolved in dichloromethane, and then precipitated with methanol to obtain a white polycarbonate solid. The number average molecular weight of the po...

Embodiment 3

[0030] Add glycerin and diethylzinc to tetrahydrofuran, and age at 60°C for 1 hour under the protection of nitrogen atmosphere to obtain a suspension solution; then add neodymium borohydride to tetrahydrofuran to obtain a solution, and then add this solution to the above suspension solution , aged at 60° C. for 1 hour under the protection of nitrogen atmosphere to obtain a white three-way catalyst suspension solution, wherein the molar ratio of neodymium borohydride, diethylzinc and glycerin is 1:20:10.

[0031] Add the prepared three-way catalyst suspension solution and propylene oxide into the autoclave respectively, fill with carbon dioxide, maintain the pressure at 3Mpa, react at 60°C for 6 hours, terminate with 50ml of methanol, and obtain a white solid in dilute hydrochloric acid solution After soaking for 12 hours, it was dissolved in dichloromethane, and then precipitated with methanol to obtain a white polycarbonate solid. The number average molecular weight of the pol...

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PUM

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Abstract

The invention discloses a ternary catalyst for preparing fatty group polycarbonate, comprising three components of boron hydrogenation rare earth, zinc alkyls and glycerol, wherein the structure of the boron hydrogenation rare earth is M(BH4)3, and M is one of rare earth elements of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu; the zinc alkyls is diethyl zinc, zinc n-propyl, zinc isopropyl, zinc normal-butyl, zinc isobutyl or zinc benzyl. The ternary catalyst has easy acquirement of raw materials, simple preparation method and low cost, the fatty group polycarbonate with the number-average molecular weight exceeding 16000 and the weight-average molecular weight exceeding 45000 can be prepared, and the carbon dioxide fixation rate exceeds 36%.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a three-way catalyst for preparing aliphatic polycarbonate. Background technique [0002] With the rapid development of the economy, chemical fuels such as petroleum and coal are used in large quantities, and carbon dioxide is released in large quantities as the final product of combustion and metabolism, causing the concentration of atmospheric carbon dioxide to increase continuously, resulting in the "greenhouse effect" of the earth. Therefore, the resource utilization of carbon dioxide has attracted great attention from governments and scientists of various countries. The polycarbonate obtained by copolymerizing carbon dioxide and epoxy compounds has very broad application prospects in the fields of biology and medicine due to the presence of photodegradable and biodegradable ester bonds. Therefore, it is of great significance to develop efficient catalysts suitable for the copolymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/02C08G64/34
Inventor 刘光烜江黎明邱利焱
Owner ZHEJIANG UNIV
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