A kind of purification separation method of sucrose fatty acid ester

Abstract

The invention discloses a method for purifying and separating a sucrose fatty acid ester. The method comprises the following steps: 1) adding a sucrose fatty acid ester mixture into a furyl compound solvent, stirring and dissolving at the temperature of 0-40 DEG C, filtering to obtain a sucrose fatty acid ester mother liquid; 2) adding C1-C3 alcohol into the sucrose fatty acid ester mother liquid, standing at the temperature of 0-40 DEG C, filtering to obtain a filtrate and a solid precipitate, distilling and drying the filtrate to obtain a sucrose fatty acid ester product I, and drying the solid precipitate to obtain a sucrose fatty acid ester product II. The purifying and separating method purifies and separates the sucrose fatty acid ester at the same time, the process is simple, the product purity is high, the recovery is high, an organic solvent is easy to recycle and utilize, no saline organic wastewater is produced in the extracting process, a high-purity and high-monoester-content sucrose fatty acid ester product is finally obtained, and the obtained solid residue can be recycled and applied to the synthesis of the sucrose fatty acid ester.

Description

technical field [0001] The invention relates to a purification and separation method of sucrose fatty acid ester. Background technique [0002] Sucrose fatty acid ester is one or more hydroxyl groups of sucrose and C 8 ~C 22 It is a kind of green non-ionic surfactant formed by the esterification of fatty acids. It has the advantages of wide hydrophilic-lipophilic balance value, excellent emulsifying performance, non-toxic, and biodegradable. It is widely used in food, medicine, cosmetics and other industries. . At present, the industrial production of sucrose fatty acid ester mainly adopts transesterification method, which can be subdivided into solvent method and solvent-free method. The sucrose fatty acid ester obtained by these two methods not only contains sucrose fatty acid monoester, sucrose fatty acid diester and Sucrose fatty acid polyester also contains impurities such as unreacted sucrose, fatty acid methyl ester (or ethyl ester or glyceride), fatty acid potassi...

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Problems solved by technology

[0007] However, the above-mentioned method for purifying and separating sucrose fatty acid ester generally has the following problems: 1) the total ester content of sucrose fatty acid ester, especially the monoester content, is relatively low, which cannot meet the requirements of the high-end product market; 2) the process is complicated, and the sucrose The recovery rate of fatty acid ester is not high, and the refining cost is high; 3) The amount of solvent used is large, and the NaCl brine introduced in the process will cause problems in the treatment of salty and organic wastewater, which increases the cost and increases the pressure on environmental protection; 4) due to the need Add CaCl 2 , MgSO 4 and other divalent metal salts to precipitate fatty acid soaps, increasing solid waste

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