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Method for preparing food grade triacetyl glycerine

A triacetin, food-grade technology, applied in the field of preparation of food-grade triacetin, can solve the problems that can not be further improved, affect product quality, etc., achieve the improvement of heavy metal content, improve quality and stability, and reduce moisture Effect

Active Publication Date: 2009-11-25
JIANGSU RUIJIA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The glycerides produced by the existing technology, because the product has high moisture content, it is easy to cause the product to undergo a reverse reaction
Glyceryl triacetate and water can easily regenerate glacial acetic acid at room temperature, which greatly increases the acid value of the product and affects product quality
Indexes such as product content, chroma, and heavy metals cannot be further improved because they have not undergone post-processing

Method used

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  • Method for preparing food grade triacetyl glycerine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the esterification reaction adopts rectification technology. Put glycerin, glacial acetic acid, azeotropic dehydrating agent and acid catalyst into the reaction kettle with rectification tower, condenser and water separator to carry out the reaction. In the tower, after the discharge water reaches the theoretical value, the dehydrating agent and unreacted glacial acetic acid are distilled out and returned for recycling. The crude product from the tower kettle is sent to the acylation kettle, and after adding acetic anhydride to react, triacetin is vacuumed Pull out from the kettle to obtain ordinary glycerol triacetate.

[0017] Then put the common triacetin (5000Kg) into a stirred reactor, add 10Kg of activated carbon, and stir at room temperature for 2 to 3 hours. Open the bottom valve of the miscellaneous pot, filter through the plate and frame filter press, and pump the filtrate into the intermediate storage tank. The triacetin after re...

Embodiment 2

[0021] Active carbon add-on is 25kg, and other processing conditions are identical with embodiment 1.

Embodiment 3

[0023] Active carbon add-on is 50Kg, and other process conditions are identical with embodiment 1.

[0024] The products obtained in Examples 1-3 have the following common characteristics: triacetin content of 99.5%, chromaticity below 10, acid value of about 0.005%, water content of less than 0.05%, and heavy metal content of about 5ppm. It can be seen that the product of the present invention has improved quality and stability, and is suitable for use as food-grade triacetin.

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Abstract

The invention discloses a method for preparing food grade triacetyl glycerine, which comprises the following steps: after glycerin and glacial acetic acid are esterified and acylated, ordinary triacetyl glycerine is prepared; the ordinary triacetyl glycerine is pressed and filtered by a plate and frame filter press; active carbon is used for removing impurities so as to ensure that the chrominance of the triacetyl glycerine is smaller than No.10; and under the conditions of a vacuum degree of -0.098MPa and a temperature of 120-150 DEG C, nitrogen is used as shielding gas for carrying out gas purification on the product with the chrominance smaller than No.10 and fine filtering out a light component so as to ensure that the acid value of the triacetyl glycerine is smaller than or equal to 0.005 percent. The method greatly improves properties such as the content, the chrominance, the acid value, the water content, the heavy metal content, and the like of the triacetyl glycerine and the quality and the stability of the triacetyl glycerine.

Description

technical field [0001] The present invention relates to, specifically, the present invention is a kind of preparation method of food grade triacetin. Background technique [0002] Glyceryl triacetate, also known as glycerol triacetate. The English name is Glycerol Triacetate. Molecular formula C 9 h 14 o 6 , Solubility properties: soluble in alcohol, ether, benzene, chloroform and castor oil, but insoluble in linseed oil. It can dissolve nitrocellulose, cellulose acetate, acrylic resin, polyvinyl acetate, etc. Glyceryl triacetate can be used as a solvent for photo films, preservatives, etc., as well as a plasticizer, an emulsifier for gum-based substances, and a spice fixative. Glyceryl triacetate is widely used in tobacco, food and metallurgical industries as a safe and non-toxic plasticizer. [0003] At present, glyceryl triacetate production enterprises usually produce finished product of glycerol triacetate in two steps. The first step is to carry out the esterif...

Claims

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Application Information

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IPC IPC(8): C07C69/18C07C67/08
Inventor 张勇周子牛杨旭中路涛
Owner JIANGSU RUIJIA CHEM
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