Purification method of glycerol triacetate
A technology of triacetin and a purification method, applied in the field of triacetin purification, can solve problems such as failure to meet high standard requirements, and achieve the effects of optimized production process, simple separation device and easy operation
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Embodiment 1
[0019] A method for purifying triacetin, comprising the following steps:
[0020] A. Stock solution preparation:
[0021] ①Feeding: Add acetic acid and glycerin according to the mass ratio (3-4):1, add catalyst and dehydrating agent at the same time, start heating after feeding;
[0022] ② Esterification: Rely on the dehydrating agent and water to form an azeotrope to continuously remove the water generated by the reaction. When the speed of the dehydrating agent to take out the water slows down to the point where only the water-carrying agent returns, the esterification ends;
[0023] ③ Preliminary deacidification: control the temperature and steam most of the excess acetic acid;
[0024] ④ Acylation: Acetic anhydride is added at a temperature of 100-110°C for acylation and heating at the same time;
[0025] ⑤ High deacidification, refining, washing, adsorption, filtration, and drying: After acylation, add alkali to neutralize, heat up to deacidify, and finally wash, absorb...
Embodiment 2
[0029] The specific implementation method is the same as in Example 1, except that the internal pressure modified PTFE ultrafiltration membrane with a molecular weight cut-off of 160 is used, the pressure drop is 0.3MPa, and the stock solution obtained in step 5 is passed through ultrafiltration at a temperature of 28-32°C. Membrane device, the permeate is directly returned to the feeding recovery, and the concentrated liquid, that is, the product, directly enters the product storage tank. The purity of the concentrate reaches 99.68%.
[0030] The specific modification method of the internal pressure modified PTFE ultrafiltration membrane is as follows: through the chemical reaction between the corrosive liquid and the PTFE ultrafiltration membrane, part of the fluorine atoms on the surface of the material are torn off, so that a carbonized layer and a carbonized layer are left on the surface. Some polar groups increase the surface energy, reduce the contact angle, and change ...
Embodiment 3
[0032] The specific implementation is the same as in Example 1, except that the internal pressure modified PTFE ultrafiltration membrane with a molecular weight cut-off of 170 is used, the pressure drop is 0.3MPa, and the stock solution obtained in step 5 is passed through ultrafiltration at a temperature of 28-32°C. Membrane device, the permeate is directly returned to the feeding recovery, and the concentrated liquid, that is, the product, directly enters the product storage tank. The purity of the concentrate reaches 99.68%.
[0033] The specific modification method of the internal pressure modified PTFE ultrafiltration membrane is as follows: through the chemical reaction between the corrosive liquid and the PTFE ultrafiltration membrane, part of the fluorine atoms on the surface of the material are torn off, so that a carbonized layer and a carbonized layer are left on the surface. Some polar groups increase the surface energy, reduce the contact angle, and change from di...
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