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Method for preparing glyceryl triacetate

A technology of glycerol triacetate and glyceryl acetate, which is applied in the field of preparation of glycerol triacetate, can solve problems such as equipment corrosion, many side reactions, and large waste water discharge, and achieve easy control, simple operating conditions, and simple process Effect

Inactive Publication Date: 2017-04-26
田璐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem to be solved urgently in the current production is that due to the use of sulfuric acid as a homogeneous catalyst, there are many disadvantages such as serious equipment corrosion, many side reactions, poor product quality, long reaction time, large waste water discharge, and complicated post-treatment process. For many years, the same problem faced by the production process of many lipid compounds using sulfuric acid as a catalyst in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of triacetin, comprising the following steps:

[0021] (1) Put glycerin and methyl acetate in a molar ratio of 1:1.2 into the reaction kettle with a reflux device, and add potassium hydroxide solution with a concentration of 3~5wt% as a catalyst to react for 1~2.5 hours to obtain the reaction product , the reaction product is a mixture containing glycerol triacetate, methyl acetate, glycerin, methanol and alkali catalyst;

[0022] (2) Distill the mixture obtained in step (1) at a temperature of 70~80°C, separate the mixture of methyl acetate and methanol, and obtain the mixture of glycerol triacetate, glycerin and alkali catalyst; the obtained methyl acetate The mixture of methanol and methanol is subjected to water separation, methyl acetate is separated, and methanol aqueous solution is obtained, and methanol aqueous solution is used to produce glass water. The separated methyl acetate is refluxed to step (1) and used as a raw material.

[0023]...

Embodiment 2

[0027] A preparation method of triacetin, comprising the following steps:

[0028] (1) Put glycerin and methyl acetate in a molar ratio of 1:2 into the reaction kettle with a reflux device, and add a sodium hydroxide solution with a concentration of 3~5wt% as a catalyst to react for 1~2.5 hours to obtain the reaction product , the reaction product is a mixture containing glycerol triacetate, methyl acetate, glycerin, methanol and alkali catalyst;

[0029] (2) Distill the mixture obtained in step (1) at a temperature of 70~80°C, separate the mixture of methyl acetate and methanol, and obtain the mixture of glycerol triacetate, glycerin and alkali catalyst; the obtained methyl acetate The mixture of methanol and methanol is subjected to water separation, methyl acetate is separated, and methanol aqueous solution is obtained, and methanol aqueous solution is used to produce glass water. The separated methyl acetate is refluxed to step (1) and used as a raw material.

[0030] (3...

Embodiment 3

[0034] A preparation method of triacetin, comprising the following steps:

[0035] (1) Put glycerin and methyl acetate in a molar ratio of 1: 1.6 into a reaction kettle with a reflux device, and add a sodium hydroxide solution with a concentration of 3~5wt% as a catalyst to react for 1~2.5 hours to obtain a reaction product , the reaction product is a mixture containing glycerol triacetate, methyl acetate, glycerin, methanol and alkali catalyst;

[0036] (2) Distill the mixture obtained in step (1) at a temperature of 70~80°C, separate the mixture of methyl acetate and methanol, and obtain the mixture of glycerol triacetate, glycerin and alkali catalyst; the obtained methyl acetate The mixture of methanol and methanol is subjected to water separation, methyl acetate is separated, and methanol aqueous solution is obtained, and methanol aqueous solution is used to produce glass water. The separated methyl acetate is refluxed to step (1) and used as a raw material.

[0037] (3)...

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PUM

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Abstract

The invention provides a method for preparing glyceryl triacetate. The method includes the following steps that firstly, glycerol and an excessive amount of methyl acetate are added into a reaction kettle with a reflux device, and alkali is added to serve as a catalyst to be reacted for 1-2.5 h; secondly, the mixture obtained in the first step is distilled at 70-80 DEG C; thirdly, the mixture composed of glyceryl triacetate, glycerol and the alkaline catalyst and obtained in the second step is extracted by means of an extraction agent; fourthly, the mixture composed of glyceryl triacetate and the extraction agent and obtained in the third step is distilled at 80-90 DEG C, the extraction agent is separated out, and the finally product, namely glyceryl triacetate, is obtained. Glycerol and methyl acetate react to generate glyceryl triacetate, the process is free of pollutant emission, the problem that equipment is severely corroded by using sulfuric acid as a catalyst is solved, the process is simple, operation conditions are simple, and the method is easy to control.

Description

technical field [0001] The invention relates to a preparation method of glycerol triacetate, which belongs to the technical field of chemical synthesis. Background technique [0002] Glyceryl triacetate has a wide range of uses, the largest use being as a plasticizer for cigarette filters. As a wide range of chemical products, it can be used as a plasticizer and solvent for cellulose acetate, nitrocellulose, etc. It also has a plasticizing effect on natural rubber and synthetic rubber, and does not affect the vulcanization operation. As an important chemical raw material, triacetin has been developed for use in food, cosmetics, medicine and dye industries. In the food industry, triacetin has low toxicity and can be used as a mild fungicide for vegetables, fruits, animal glue and synthetic glue; in the daily chemical industry, triacetin can be used as a fixative and wetting base for cosmetics, and It is made into a household bleach solution that is not alkaline and chlorine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C07C67/58C07C67/54C07C69/18C11D3/20
CPCC07C67/03C07C67/54C07C67/58C11D3/201C07C69/18
Inventor 田璐
Owner 田璐
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