Method for preparing monolaurin

Abstract

The invention discloses a method for preparing monolaurin, which comprises the following steps: taking camphor tree seed oil as a raw material; adding degumed and dehydrated camphor tree seed oil into an esterification and alcoholysis reactor, and adding acidic ionic liquid 1-methyl-3-(3-sulfopropyl) imidazole catalyst to reacting at the temperature of between 135 and 145 DEG C until the acid value is reduced to below 0.5, wherein the temperature the dosage of the catalyst is 3 to 4 percent of the weight of the oil and the molar ratio of the alcohol to the oil is 1.5-2.5:1; performing centrifugal separation, adding the esterified and alcoholized amphor tree seed oil into a catalysis and alcoholysis reactor, and adding the alkaline ionic liquid of 1-butyl-3-methyl imidazole salt to react at the temperature of between 165 and 175 DEG C until the total content of the monofatty glyceride is over 90.0 percent, wherein the dosage of the catalyst is 0.4 to 0.6 percent of the weight of the oil and the molar ratio of the alcohol to the oil is 6-7:1; performing centrifugal separation, washing with the water at the temperature of between 15 and 35 DEG C; and performing vacuum dehydration and decoloration. The monofatty glyceride content in the product is over 90.0 percent; the monolaurin content is over 85.0 percent; and the process of molecular distillation can be saved. The technology is reasonable, energy-saving and environment-friendly; and most of the glycerol can be recycled, and the discharge of acid, alkali and salt is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of a single medium-chain fatty acid glyceride food additive (glyceryl monocaplaurate). Background technique [0002] Monoglycerides of monoglycerides (referred to as monoglycerides, monoglyceride, MG) mainly include single long-chain fatty acid glycerides (the number of fatty acid carbon atoms is equal to or greater than 14) and single medium-chain fatty acid glycerides (the number of fatty acid carbon atoms is 8 To 12), with lipophilic and hydrophilic groups, is a polyol type nonionic surfactant. Mono-long-chain fatty acid glycerides only have emulsifying effect, and are mainly used as emulsifiers for food, health care products and medicines, cosmetics and detergent surfactants. Single medium-chain fatty acid glycerides, good dispersibility and hydrophilicity in water, strong emulsifying ability, good inhibitory effect on bacteria and ...

AI Technical Summary

Problems solved by technology

At present, the single medium-chain fatty acid glyceride products sold in the domestic and foreign markets are mainly prepared from coconut oil and palm kernel oil by hydrolysis, esterification or alcoholysis. The catalysts are mainly liquid acid and alkali, solid acid and alkali , there are disadvantages such as low content of medium-carbon chain fatty acids in raw materials, alcoholysis catalysts that cannot be reused, large discharge of acid-base salts, large equipment investment, high energy consumption and production costs, etc.