Method for purifying glyceryl triacetate

A technique for triacetin and a purification method, which is applied in the field of purifying triacetin by using a thin film evaporator, can solve the problems of complicated method steps, difficult process control, high processing cost and inconvenient large-scale industrial production, and achieve the goal of processing Low cost, improved quality and purity, and high processing efficiency

Active Publication Date: 2008-06-25
江苏雷蒙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such methods have certain limitations, either the method steps are complicated or the process is not easy to control, or the high processing cost is not convenient for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0011] Examples 1-6, the evaporation area of ​​the rotary thin film evaporator can be determined according to the specific situation, from 0.2M 2 to 50M 2 not wait. Take 6M 2 Take the rotating movable scraper type thin film evaporator as an example, control the steam pressure of the preheater and the evaporator, use the flow meter to control the feeding speed, implement different operations, the acidity becomes lower, and there is no smell at all, Examples 1-6 The control parameters and results are shown in Table 1:

[0012] Table I

[0013]

Embodiment 7-10

[0014] Embodiment 7-10, with reference to the above-mentioned embodiment, heating with heat-conducting oil, with 0.2M 2 For example, the control reference and results of each embodiment are shown in Table 2:

[0015] Table II

[0016]

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PUM

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Abstract

A method for purifying the glyceryl triacetate belongs to the field of the separation and purification in the chemical industry and comprises the following steps: (1) the crude products of the glyceryl triacetate are first prepared and the acidity of the crude products is controlled to range from 0.003 per cent to 1 per cent; (2) the crude products are subject to the secondary treatment utilizing a film evaporator, the vacuum degree is controlled to range from 100Pa to 13,300Pa and the flow of the film evaporator ranges from 2 to 200kg / m<2> h; the film evaporator and the preheater are heated by the steam or heat conduction oil; when the steam is used for heating, the heating steam pressure of the preheater is controlled to range from 0.5 kgf / cm<2> to 1.5kgf / cm<2> and the steam pressure of the evaporator ranges from 2.0kgf / cm<2> to 4.0kgf / cm<2>; when the heat conduction oil is used for heating, the temperature of the heat conduction oil ranges from 120 to 160 DEG C. The process delivers high treatment efficiency, the quality purity of the obtained glyceryl triacetate is obviously enhanced, the acidity can be lowered to be lower than 0.002 per cent without causing any odor.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and relates to a method for purifying triacetin by utilizing a thin-film evaporator. Background technique [0002] As a fine chemical product with a wide range of uses, triacetin can not only be used as a plasticizer for cellulose diacetate, a solvent for flavors and fragrances in the production of cigarette filters, but also as a raw material for food emulsifiers and environmentally friendly plasticizers. . Among these uses, manufacturers often have high quality requirements on product acidity, odor and other aspects. [0003] At present, the common production process of triacetin is generally as follows: acetic acid and glycerin are continuously separated from the water produced by esterification under the action of catalyst sulfuric acid, and then add acetic anhydride to complete esterification, and then add a small amount of alkali to carry out After neutr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54C07C69/18B01D3/10
Inventor 周永芳曹立军陈平吴小良
Owner 江苏雷蒙新材料有限公司
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