Preparation method of lactic ester
A lactate and carbohydrate technology, applied in the chemical industry, can solve the problems of short reaction time and high concentration of reactant sugar, and achieve the effects of low cost, high catalytic activity and improved product conversion rate.
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[0016] The invention provides a method for preparing lactate. Carbohydrate, transition metal salt, alcohol and water are mixed, and the mixed liquid is stirred and reacted at a temperature of 200-260°C and a pressure of 4-15 MPa to obtain In the lactate, the transition metal salt is acidic, the alcohol is a lower alcohol with a carbon number of 1-4, and the carbohydrate is a carbohydrate in which the hydrolyzate includes monosaccharides.
[0017] The reaction mechanism of the present invention is: the depolymerization reaction occurs on macromolecules such as cellulose, and the macromolecules form small molecular substances through depolymerization. When the raw material is cellulose, the fiber macromolecules first obtain monosaccharides through hydrolysis, and then through a series of reactions such as ring opening, isomerization, and esterification, to finally obtain lactate. The main factors affecting the preparation of lactate are temperature, pressure, catalyst, time, and so...
Example Embodiment
[0040] The first embodiment of the present invention is:
[0041] In the method for preparing lactate in this embodiment, carbohydrates, transition metal salts, alcohol, and water are mixed, and the mixed liquid is stirred and reacted at a temperature of 200° C. and a pressure of 4 MPa to obtain the milk. The solid-liquid ratio of the mass of the carbohydrate to the total volume of the alcohol and water is 1:1, the volume ratio of the alcohol to water is 20:1, the transition metal salt is acidic, and the alcohol It is a lower alcohol with a carbon number of 1 to 4, and the carbohydrate is a carbohydrate containing monosaccharides as a hydrolysate. The alcohol is selected from one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol. The carbohydrate is selected from one or more of plant cellulose, human fibrin, starch, sucrose, fructose and glucose. The metal in the transition metal salt is selected from one or more of titanium, platinum, nickel, zirc...
Example Embodiment
[0042] The second embodiment of the present invention is:
[0043] In the preparation method of lactate in this embodiment, carbohydrates, transition metal salts, alcohol and water are mixed, and the mixed liquid is stirred and reacted at a temperature of 260° C. and a pressure of 15 MPa to obtain the milk. The solid-liquid ratio of the mass of the carbohydrate to the total volume of the alcohol and water is 1:60, the volume ratio of the alcohol to water is 1:20, the transition metal salt is acidic, and the alcohol It is a lower alcohol with a carbon number of 1 to 4, and the carbohydrate is a carbohydrate containing monosaccharides as a hydrolysate. The alcohol is selected from one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol. The carbohydrate is selected from one or more of plant cellulose, human fibrin, starch, sucrose, fructose and glucose. The metal in the transition metal salt is selected from one or more of titanium, platinum, nickel, z...
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