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Method for composite phosphotungstate catalyzed synthesis of citrate ester

A technology of composite phosphotungstate and citrate, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problems of application limitation and high silver price, and achieve easy preparation and low cost , the effect of high yield

Active Publication Date: 2016-10-12
SHAOYANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of silver, its application is limited

Method used

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  • Method for composite phosphotungstate catalyzed synthesis of citrate ester

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Experimental program
Comparison scheme
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Embodiment 1

[0023] Catalyst preparation: Weigh 0.35 mmol of ammonium carbonate, 0.4 mmol of titanium sulfate and 1 mmol of phosphotungstic acid and dissolve them in 20 ml of deionized water; after dissolving, slowly add the titanium sulfate solution dropwise to In the phosphotungstic acid solution, react for 0.5 hours, then slowly add ammonium carbonate solution dropwise, and gradually form a white precipitate; after the dropwise addition, continue to stir and react for 0.5 hours, let stand and age for 1 hour, the precipitate is separated by filtration, dried, The molecular formula can be obtained as (NH 4 ) 0.7 Ti 0.4 h 0.7 PW 12 o 40 compound phosphotungstate.

Embodiment 2

[0025] The preparation of catalyst: preparation process is the same as embodiment 1, only changes the add-on of ammonium carbonate into 0.5 mmol, molecular formula can be obtained as (NH 4 ) 1 Ti 0.4 h 0.4 PW 12 o 40 compound phosphotungstate.

Embodiment 3

[0027] The preparation of catalyst: preparation process is the same as embodiment 1, only changes the add-on of ammonium carbonate into 0.2 mmol, molecular formula can be obtained as (NH 4 ) 0.4 Ti 0.4 h 1 PW 12 o 40 compound phosphotungstate.

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Abstract

The invention relates to a method for composite phosphotungstate catalyzed synthesis of citrate ester. The citrate ester is synthesized through an esterification reaction of citric acid and fatty alcohol with composite phosphotungstate as a catalyst. The structure formula of the composite phosphotungstate adopted in the invention is (NH4)xM(3-x-y) / 4HyPW12O40, wherein M is Ti or Zr, x is 0.4-1, and y is 0.4-1. The method has the following advantages: the catalyst has low cost, is easy to prepare, has a high catalysis efficiency, can be simply separated from the above product, and has excellent performances when being reused.

Description

technical field [0001] The invention relates to a method for synthesizing citrate, in particular to a method for catalyzing the synthesis of citrate with complex phosphotungstate. Background technique [0002] Citrate is a non-toxic plasticizer with a wide range of uses. It has the advantages of non-toxicity, low volatility, high plasticizing efficiency and good compatibility. As one of the green alternatives to traditional phthalate plasticizers, the U.S. Food and Drug Administration has approved the use of citrate plasticizers in food packaging materials, medical appliances and personal hygiene products, etc. . In recent years, citric acid esters have become the first environmentally friendly plasticizers at home and abroad. [0003] In the traditional production process of citrate, concentrated sulfuric acid is mainly used as a catalyst. Concentrated sulfuric acid is cheap and has high catalytic activity. However, there are many by-products in the reaction, which caus...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/704B01J31/18B01J27/188
CPCB01J27/188C07C67/08C07C69/704
Inventor 周喜袁浩坤
Owner SHAOYANG UNIV