Method for purifying glyceryl triacetate
A technology of glycerol triacetate and a purification method is applied in the field of purifying glycerol triacetate by using a thin-film evaporator, and can solve the problems of high processing cost, inconvenience in large-scale industrial production, difficult process control, complicated method steps, etc. The effect of low cost, improved quality and purity, and high processing efficiency
Active Publication Date: 2010-09-22
江苏雷蒙新材料有限公司
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- Abstract
- Description
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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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Experimental program
Comparison scheme
Effect test
Embodiment 1-6
[0011] Embodiment 1-6, the evaporation area of rotary thin film evaporator can be decided according to specific conditions, from 0.2M 2 to 50M 2 wait. Take 6M 2 Take the rotary movable scraper type thin film evaporator as an example, control the vapor pressure of the preheater and evaporator, control the feed rate with a flow meter, implement different operations, the acidity becomes lower, and there is no odor 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 above-mentioned embodiment, heat with heat conduction oil, with 0.2M 2 Taking the thin film evaporator as an example, the control reference and results of each embodiment are shown in Table 2:
[0015] Table II
[0016]
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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 utilizinga 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 ofthe 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 using a thin film evaporator. Background technique [0002] Glyceryl triacetate is a fine chemical product with a wide range of uses. It can be used not only as a plasticizer for cellulose diacetate in the production of cigarette filters, as a solvent for flavors and fragrances, but also as a raw material for food emulsifiers and environmentally friendly plasticizers. . In these types of uses, manufacturers often have high requirements on the quality of the product in terms of acidity and odor. [0003] At present, the common production process of glycerol triacetate is generally: acetic acid and glycerin are under the action of catalytic sulfuric acid, and the water produced by the esterification is continuously separated through the water-carrying agent, and then the acetic anhydride is added for complete est...
Claims
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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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