Method for producing triacetin

Abstract

The invention provides a method for preparing acetin. The method comprises that: in the presence of alkali catalyst, grease reacts with acetate, and acetin and fatty acid ester are collected. The method has the advantages of: (1), producing the acetin directly by using the grease and the acetate, generating little side reaction, achieving high product quality and widely used by products; 2, avoiding using acetic acid and acid catalyst, solving the problem of serious corrosion existing in the conventional process and lowering requirements on equipment material and operation and maintenance costs; and 3, enlarging the application range of methyl acetate.

Description

technical field

[0001] The invention belongs to the technical field of fine chemical production, and relates to a method for preparing glyceryl acetate. Background technique

[0002] Glyceryl acetate, also known as glycerol acetate, is mainly used as an adhesive plasticizer for the formation of cellulose acetate tow filter rods; it is also used as an intermediate of fine chemical products, and can also be used as a solvent, disinfectant, fixative, food and adhesive additives.

[0003] Glyceryl acetate is prepared from glycerin and acetic acid raw materials under the action of an acid catalyst. Because sulfuric acid is cheap and has high catalytic activity, it is the most commonly used catalyst, but it has strong corrosion, many side reactions, dark reaction liquid, troublesome post-processing of products, and serious environmental pollution. In order to reduce side reactions, p-toluenesulfonic acid can also be selected as a catalyst, but the reaction speed is slow, and the...

Examples

example 1

[0022] In a 500ml reactor with electromagnetic stirring, add 150g of methyl acetate, 120g of rapeseed oil and 1% sodium methoxide by weight of the material. The reaction was carried out at 80°C and 0.15MPa, and the reaction time was 90min. Cooling, separation, the yield of glycerol acetate is 96.5%.

example 2

[0024] In a 500ml reactor with electromagnetic stirring, 150g of ethyl acetate, 200g of soybean oil and 2% potassium hydroxide by weight of the material were added. The reaction was carried out at 60° C. under normal pressure, and the reaction time was 60 minutes. After cooling and separation, the yield of glycerol acetate was 95.1%.

example 3

[0026] In a 500ml reactor with electromagnetic stirring, add 150g methyl acetate, 100g cottonseed oil and 0.5% sodium hydroxide by weight of the material, and the reaction is carried out at 150°C and 1.0MPa, and the reaction time is 30min. After cooling and separation, the yield of glycerol acetate was 97.4%.

technical field

[0001] The invention belongs to the technical field of fine chemical production, and relates to a method for preparing glyceryl acetate. Background technique

[0002] Glyceryl acetate, also known as glycerol acetate, is mainly used as an adhesive plasticizer for the formation of cellulose acetate tow filter rods; it is also used as an intermediate of fine chemical products, and can also be used as a solvent, disinfectant, fixative, food and adhesive additives.

[0003] Glyceryl acetate is prepared from glycerin and acetic acid raw materials under the action of an acid catalyst. Because sulfuric acid is cheap and has high catalytic activity, it is the most commonly used catalyst, but it has strong corrosion, many side reactions, dark reaction liquid, troublesome post-processing of products, and serious environmental pollution. In order to reduce side reactions, p-toluenesulfonic acid can also be selected as a catalyst, but the reaction speed is slow, and the...

Examples

example 1

[0022] In a 500ml reactor with electromagnetic stirring, add 150g of methyl acetate, 120g of rapeseed oil and 1% sodium methoxide by weight of the material. The reaction was carried out at 80°C and 0.15MPa, and the reaction time was 90min. Cooling, separation, the yield of glycerol acetate is 96.5%.

example 2

[0024] In a 500ml reactor with electromagnetic stirring, 150g of ethyl acetate, 200g of soybean oil and 2% potassium hydroxide by weight of the material were added. The reaction was carried out at 60° C. under normal pressure, and the reaction time was 60 minutes. After cooling and separation, the yield of glycerol acetate was 95.1%.

example 3

[0026] In a 500ml reactor with electromagnetic stirring, add 150g methyl acetate, 100g cottonseed oil and 0.5% sodium hydroxide by weight of the material, and the reaction is carried out at 150°C and 1.0MPa, and the reaction time is 30min. After cooling and separation, the yield of glycerol acetate was 97.4%.