Method for preparing glycerol triacetate

A technology of glycerol triacetate and glycerin, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of high energy consumption, high product color, and easy polymerization of products, and achieve Complete chemical reaction, fewer side reactions, less impurities

Active Publication Date: 2011-02-16
湖南先伟阳光生物科技有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, this method has disadvantages such as high energy consumption, easy polymerization of the product at high temperature, and high chroma of the product.

Method used

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  • Method for preparing glycerol triacetate

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Embodiment 1

[0026] Utilizing the acid alcohol esterification reaction mechanism, the esterification reaction adopts distillation technology, adding glycerin, glacial acetic acid, acid catalyst, and azeotropic dehydrating agent to the reaction kettle with glass tower and condenser, and the mixture in the reaction kettle is passed through the pump Press into the external external circulation evaporator, control the temperature of the reaction kettle at about 100℃, and the temperature inside the external circulation evaporator at about 110℃. The water produced by the reaction is continuously discharged at the top of the tower through the external circulation evaporator, and the azeotropic agent is refluxed to the tower in. The crude product is sent to the acylation kettle, acetic anhydride is added to the reaction, and then deacidified to obtain the crude triacetin;

[0027] Put the measured crude triacetin into the refining kettle, and put into the activated carbon soaked in triacetin in advan...

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Abstract

The invention discloses a method for preparing glycerol triacetate, which aims to make completer esterification, shorten reaction time, reduce side reaction, increase the yield of product and product content and improve the chromaticity of the product. The method comprises the following steps of: performing the esterification, acylation and deacidification on glycerol and a glacial acetic acid toprepare a glycerol triacetate crude product, wherein water distribution is performed in the esterification process by adopting an external circulating evaporator; and de-coloring the glycerol triacetate crude product obtained by the acylation and deacidification by adopting activated carbon, separating a head fraction, and performing cooling and circulating filtration to form the high-content glycerol triacetate. The invention discloses the economic and environmentally-friendly method for preparing the glycerol triacetate, which greatly improves the quality of product, reduces the post-treatment steps of the product, reduces energy consumption and brings the dual effects of process optimization, and energy saving and consumption reduction.

Description

Technical field [0001] The invention belongs to the field of separation and purification of chemical products, and relates to a method for preparing triacetin by using an external circulation evaporator for esterification of water separation. Background technique [0002] Triacetin, also known as triacetin. English name Glycerol Triacetate, molecular formula C 9 H 14 O 6 , Molecular weight 218.21, is a colorless and odorless oily liquid, non-toxic and non-irritating. Glyceryl triacetate is soluble in alcohol, ether, benzene, chloroform and castor oil, but insoluble in linseed oil. It can dissolve nitrocellulose, acrylic resin, polyvinyl acetate, etc. Glyceryl triacetate has good gelation and physiological inertia, and is widely used as a cellulose acetate plasticizer for cigarette filters, food additives, cosmetic fixatives and lubricating bases. As a safe and non-toxic plasticizer, triacetin is widely used in tobacco, food, and metallurgical industries. [0003] The current en...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/18C07C67/52
Inventor 罗伟
Owner 湖南先伟阳光生物科技有限公司
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