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Method for purifying sucrose fatty acid esters

A technology for the purification of sucrose fatty acid esters, which is applied in the field of purification of sucrose fatty acid esters, can solve the problems of low total ester content, low product purity, and inability to meet higher requirements for product purity, and achieve improved content levels, Improving the purity and benefiting the effect of industrialized production

Active Publication Date: 2013-05-08
LIUZHOU GAOTONG FOOD CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the industrial methods for synthesizing sucrose esters adopt the transesterification method. The transesterification method is divided into solvent method and solvent-free method. The sucrose ester products produced by these two methods contain more other substances, such as unreacted free sugar, Impurities such as soap body, fatty acid, fatty acid methyl ester or catalyst, the purity of the product is not high
Patent No. CN 200510006011.1, an invention patent, discloses a method for purifying sucrose fatty acid esters. This method is suitable for the purification of crude sucrose esters produced by transesterification, but the sucrose ester products obtained after purification by this method, the total ester The highest content is only 94%, and the total ester content is still low, which cannot meet the higher requirements of users for product purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 100 grams of the above-mentioned crude sucrose ester A, add 400 ml of ethyl acetate (C, p) and heat up to 65 ° C, and add dropwise 30 g of an aqueous NaCl solution with a concentration of 5% by mass of 5 grams of anhydrous calcium chloride dissolved in it under stirring, The mixture was stirred at 65°C for 25 minutes, and the precipitate was removed by filtration. Add 100 g of 5% sodium chloride aqueous solution at 60° C., stir at 60° C. for 15 minutes, and let stand to separate the lower water layer. The supernatant of the organic phase was cooled to 10° C. under stirring, and the liquid was removed by vacuum filtration, and the filter cake was evaporated to dryness under reduced pressure to obtain 53.2 g of a purified sucrose ester sample. Its total ester content is 98.2%, acid value is 0.82 mgKOH / g, free sugar is 0.47%, and ash content is 0.28%. The monoester content of the sample is 56.8%.

Embodiment 2

[0035] Take 100 grams of the above-mentioned crude sucrose ester A, add 400 ml of ethyl acetate (C, p) and heat up to 65 ° C, add dropwise 30 g of 5% NaCl aqueous solution with 5 g of anhydrous calcium chloride dissolved in it under stirring, and the mixture After stirring at 65°C for 25 minutes, the precipitate was removed by filtration. Add 100 g of 5% sodium chloride aqueous solution at 60° C., stir at 60° C. for 15 minutes, and let stand to separate the lower water layer. The supernatant of the organic phase was cooled to 20° C. under stirring, vacuum filtered, and the filter cake was evaporated to dryness under reduced pressure to obtain 50.5 g of a purified sucrose ester sample. Its total ester content is 98.4%, acid value is 0.84 mgKOH / g, free sugar is 0.49%, and ash content is 0.28%. The monoester content of the sample was 59.4%.

Embodiment 3

[0037] Take 100 grams of the above-mentioned crude sucrose ester A, add 400 ml of ethyl acetate (C, p) and heat up to 65 ° C, add dropwise 30 g of 5% NaCl aqueous solution with 5 g of anhydrous calcium chloride dissolved in it under stirring, and the mixture After stirring at 65°C for 25 minutes, the precipitate was removed by filtration. Add 100 g of 5% sodium chloride aqueous solution at 60° C., stir at 60° C. for 15 minutes, and let stand to separate the lower water layer. The supernatant of the organic phase was cooled to 40° C. under stirring, vacuum filtered, and the filter cake was evaporated to dryness under reduced pressure to obtain 42 g of a purified sucrose ester sample. Its total ester content is 98.8%, acid value is 0.82 mgKOH / g, free sugar is 0.45%, and ash content is 0.32%. The monoester content of the sample was 71.4%.

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Abstract

The invention relates to a method for purifying sucrose fatty acid esters. The method comprises the following steps: dissolving crude sucrose ester products in an organic solvent which can be separated from water, thereby obtaining a crude sucrose ester product solution; dropwise adding a salt aqueous solution while stirring, so that fatty acid soap substances in the crude sucrose ester product solution generate fatty-acid alkaline-earth metal salts, wherein alkaline-earth metal salts and / or alkaline-earth metal oxides are dissolved in the salt aqueous solution, and the fatty-acid alkaline-earth metal salts are not dissolved in the organic solvent; removing generated solid fatty acid alkaline earth metal salts; adding saline water into the obtained object to carry out stirring and extraction, and sanding for separating a lower water layer; cooling liquid supernatant to 0-40 DEG C through stirring, and separating out sucrose ester crystal substances in precipitation form; removing liquid and taking solid matters; and drying the solid matters so as to obtain a sucrose ester product. According to the invention, a technological process of cooling crystallization is introduced, so that the problem that reaction raw materials such as fatty acid methyl esters and the like remain in products is solved, therefore, the content level of products is further improved, and the total ester content of products is more than 98%.

Description

technical field [0001] The invention relates to a method for purifying sucrose fatty acid ester. Background technique [0002] Sucrose fatty acid ester, also known as sucrose ester (abbreviated as SE), is an ester formed by esterifying sucrose with C9~C22 fatty acid in an appropriate system. It has good emulsifying effect on water and oil, and its HLB value is (Hydrophile-lipophile balance value) can be adjusted in a wide range. As an excellent nonionic surfactant, it is widely used in many fields such as food, pharmacy, and daily chemical, and has broad development prospects. [0003] At present, most of the industrial methods for synthesizing sucrose esters adopt the transesterification method. The transesterification method is divided into solvent method and solvent-free method. The sucrose ester products produced by these two methods contain more other substances, such as unreacted free sugar, Impurities such as soap body, fatty acid, fatty acid methyl ester or catalys...

Claims

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Application Information

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IPC IPC(8): C07H13/06C07H1/06
Inventor 韦盛孙李荫展覃仲尧赵海南叶丽谭恒朱泳宏
Owner LIUZHOU GAOTONG FOOD CHEM
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