Method for preparing high-content glycerol triacetate

A technology with high content of glyceryl triacetate, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc. It can solve the problems of increased acid value, complicated method steps, and affecting product quality, etc., and achieves processing efficiency. High, high content, low processing cost

Active Publication Date: 2011-04-13
湖南先伟阳光生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned methods all have certain limitations, or the method steps are complicated, or the process is difficult to control, or the high processing cost is not convenient for large-scale industrial production
The produced product has high moisture content, which is easy to cause the product to undergo a reverse reaction to generate glacial acetic acid, which increases the acid value of the product and affects the quality of the product

Method used

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Examples

Experimental program
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Embodiment 1

[0019] Using the mechanism of acid alcohol esterification reaction, the esterification reaction adopts rectification technology, adding glycerin, glacial acetic acid and acid catalyst, and azeotropic water agent into the reaction kettle with rectification tower, condenser and water separator to react. The water produced by the reaction is continuously removed from the top of the tower, and the entrainer is returned to the tower. The crude product is sent to the acylation kettle, and then deacidified after adding acetic anhydride to react to obtain the crude product of glycerol triacetate;

[0020] Put the measured crude product of triacetin into the refining kettle, and put into the activated carbon soaked with triacetin in advance. The amount of activated carbon is 0.05-0.1% of the mass of the crude product of triacetin; after cleaning the filter system, add activated carbon as appropriate according to the clarification of the feed liquid during the reflux cycle. Turn on the...

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PUM

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Abstract

The invention relates to a method for preparing high-content glycerol triacetate. The method is a continuous refining process, and comprises the following steps of: performing catalytic esterification, acylation, deacidification and neutralization on glycerol and glacial acetic acid to prepare a crude glycerol triacetate product; and performing decolourization by using activated carbon and separating starting fractions under the condition of the temperature of between 110 and 125 DEG C, the vacuum degree of less than or equal to 300Pa and nitrogen bubbling, cooling in a reactor to less than 60 DEG C, and performing circulating filtration to prepare the glycerol triacetate with the content of over 99.7 percent. Meanwhile, the glycerol triacetate prepared by the method has the chromaticity of less than No.15 and the acid value of less than or equal to 0.007 percent. The method greatly improves the content of the glycerol triacetate and the quality and the stability of the glycerol triacetate.

Description

technical field [0001] The invention belongs to the field of separation and purification of chemical products, and relates to a method for preparing high-content triacetin by adopting a continuous refining method. Background technique [0002] Glyceryl triacetate, also known as glycerol triacetate. English name Glycerol Triacetate, molecular formula C 9 h 14 o 6 , Molecular weight 21821, is a colorless and odorless oily liquid, non-toxic and non-irritating. Triacetin is soluble in alcohol, ether, benzene, chloroform, and castor oil, but not in linseed oil. Can dissolve nitrocellulose, acrylic resin, polyvinyl acetate, etc. Glyceryl triacetate has good gelling effect and physiological inertness, and is widely used as a plasticizing and curing agent for cellulose acetate in cigarette filters, food additives, cosmetic fixatives and lubricating bases. Glyceryl triacetate is widely used in tobacco, food and metallurgical industries as a safe and non-toxic plasticizer. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/18C07C67/08C07C67/56C07C67/54
Inventor 罗伟
Owner 湖南先伟阳光生物科技有限公司
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