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A kind of epoxy resin supported phosphotungstic acid catalyst and its preparation method and application

A technology of epoxy resin and phosphotungstic acid, which is applied in the chemical industry, can solve the problems of environmental pollution, easy deactivation, separation, etc., and achieve the effects of high conversion rate, short reaction time and good chemical stability

Inactive Publication Date: 2016-08-31
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing esterification reaction that the catalyst is difficult to separate from the reaction system, easy to deactivate, and pollute the environment, and to provide a load-type phosphotungstic acid catalyst that is easy to recycle.

Method used

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  • A kind of epoxy resin supported phosphotungstic acid catalyst and its preparation method and application
  • A kind of epoxy resin supported phosphotungstic acid catalyst and its preparation method and application
  • A kind of epoxy resin supported phosphotungstic acid catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Catalyst preparation with a phosphotungstic acid loading of 5%: Weigh 0.5g of phosphotungstic acid (analytical pure) and dissolve it in 1.5ml of distilled water, stir to fully dissolve it, weigh 10g of ground epoxy resin 604 powder (25- 30 mesh) in a 100ml beaker, transfer the phosphotungstic acid aqueous solution to the beaker so that it is just submerged in the epoxy resin powder, stir magnetically for 3 hours at room temperature (25°C) to make it evenly mixed, and then place the resulting mixture at room temperature ( 25°C), let it stand for 8 hours to allow the water to evaporate naturally, and then dry it in an oven at 80°C overnight (12 hours) to obtain a phosphotungstic acid loading of 5% (PW 12 to the weight ratio of the support) of the supported catalyst.

Embodiment 2

[0022] Catalyst preparation with a phosphotungstic acid loading of 10%: the preparation method is the same as in Example 1, wherein the mass of phosphotungstic acid is 1.0 g, dissolved in 1.6 ml of distilled water, and the mass of epoxy resin 604 powder is 10 g.

Embodiment 3

[0024] Catalyst preparation with a phosphotungstic acid loading of 15%: the preparation method is the same as in Example 1, wherein the mass of phosphotungstic acid is 1.5 g, dissolved in 1.8 ml of distilled water, and the mass of epoxy resin 604 powder is 10 g.

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Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a preparation method of an epoxy resin loaded phosphotungstic acid catalyst and application of the epoxy resin loaded phosphotungstic acid catalyst to synthesis of tributyl citrate. According to the preparation method, epoxy resin is used as a carrier and phosphotungstic acid H3PW12O40.xH2O (represented by PW12) is loaded on the epoxy resin; and the loading amount is 5%-20% (represented by the mass ratio of PW12 to the carrier). The prepared loaded phosphotungstic acid catalyst can be used for catalyzing an esterification reaction of citric acid and n-butyl alcohol, wherein the catalyst with the phosphotungstic acid loading amount being 15% is the most stable; the conversion rate of citric acid and the selectivity of n-butyl alcohol are 85.07%-98.77% and 84.52%-97.53%, respectively; and after the reaction, the catalyst can be recycled and still has relatively high catalytic activity after being repeatedly used for 12 times.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of an epoxy resin supported phosphotungstic acid catalyst and its application in synthesizing tributyl citrate. Background technique [0002] As an organic ester fine chemical, tributyl citrate (TBC) has the advantages of good compatibility, high plasticizing efficiency, non-toxicity, and low volatility. It has a large demand and is widely used. In the traditional industrial catalytic synthesis of TBC, concentrated sulfuric acid is often used as a catalyst, which is characterized by high conversion rate, but the disadvantage is that there are many by-products, such as alkenes, ethers, sulfuric acid esters, etc., which cause great difficulties in separation. Corrosion and environmental pollution are serious, and it is difficult to recycle. In view of the shortcomings of concentrated sulfuric acid catalysis, scholars at home and abroad ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/18C07C67/08C07C69/704
CPCY02P20/584
Inventor 李工郭剑桥虞宁黄媛媛丁嘉
Owner CHANGZHOU UNIV
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