Process for purifying sucrose fatty acid esters
First Claim
1. A process for treating a reaction mixture containing a sucrose fatty acid ester produced by the reaction of sucrose and a fatty acid alkyl ester in the presence of catalyst, which comprises subjecting to ultrafiltration an aqueous solution of a sucrose fatty acid ester containing the unreacted sucrose, the unreacted fatty acid alkyl ester, the catalyst, a soap, a fatty acid and a volatile component, wherein said reaction mixture is adjusted to pH in the range between 7.1 to 8.2 by adding an acid to the reaction mixture prior to addition of water.
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Abstract
From a reaction mixture obtained by reaction of sucrose and a fatty acid alkyl ester in the presence of a catalyst, a purified sucrose fatty acid ester is prepared without using organic solvents for purification by adding water to the reaction mixture and subjecting the resulting aqueous solution to ultrafiltration, thereby removing the unreacted sucrose, the catalyst or a salt derived from the catalyst, and the volatile component used as the reaction medium together with water. A powder of the purified sucrose fatty acid ester is easily, economically and safely prepared by subjecting the aqueous solution remaining in the ultrafiltration to reverse osmosis and spray-drying the resulting concentrate.
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19 Claims
- 1. A process for treating a reaction mixture containing a sucrose fatty acid ester produced by the reaction of sucrose and a fatty acid alkyl ester in the presence of catalyst, which comprises subjecting to ultrafiltration an aqueous solution of a sucrose fatty acid ester containing the unreacted sucrose, the unreacted fatty acid alkyl ester, the catalyst, a soap, a fatty acid and a volatile component, wherein said reaction mixture is adjusted to pH in the range between 7.1 to 8.2 by adding an acid to the reaction mixture prior to addition of water.
- 10. A process for preparing a powder of a sucrose fatty acid ester which comprises subjecting an aqueous solution of a reaction mixture obtained by the reaction of sucrose and a fatty acid methyl ester in the presence of a catalyst to ultrafiltration, said reaction mixture containing the unreacted sucrose, the unreacted fatty acid methyl ester, the catalyst, a soap, a fatty acid and a volatile component, thereby separating the unreacted sucrose, a salt drived from the catalyst and the volatile component with water, bringing the remaining aqueous solution containing the sucrose fatty acid ester, the unreacted fatty acid methyl ester, the soap and the fatty acid into contact with a reverse osmosis membrane, thereby concentrating the aqueous solution, and spray drying the resulting concentrate.
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