Process for preparing sucrose fatty acid ester powder
First Claim
1. A process for preparing a powder of sucrose fatty acid esters, which comprises reacting sucrose with a fatty acid alkyl ester in an aqueous reaction system containing a catalyst to produce a sucrose fatty acid ester, adjusting the resulting reaction mixture to a neutral pH region, adding water and a neutral salt to the reaction mixture to precipitate the sucrose fatty acid ester product, separating the resulting precipitate from the liquid phase, washing the precipitate with an acidic water, subjecting the washing liquid to ultrafiltration, spray drying the resulting concentrate in the form of an aqueous solution, and recovering the unreacted sucrose by subjecting the liquid phase to reverse osmosis.
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Abstract
A process for preparing sucrose fatty acid esters by reacting sucrose and a fatty acid alkyl ester in an aqueous reaction system in the presence of a catalyst, adding water to the reaction mixture to dissolve it, adjusting the reaction mixture to a neutral ph region, adding a neutral salt to the solution to precipitate the sucrose fatty acid esters, separating and washing the precipitate with an acidic water, and subjecting the washing liquid to ultrafiltration. The precipitate washed with the acidic water is spray-dried in the form of an aqueous slurry to give a dry powder of the sucrose esters having low HLB, and the concentrate obtained by ultrafiltration is spray-dried to form a dry powder of the sucrose esters having high HLB, and the liquid obtained by separating the precipitate is contacted with a reverse osmosis membrane to recover sucrose. According to the invention, purifed sucrose fatty acid esters can be obtained without using an organic solvent, while sucrose can be recovered in high yield.
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Citations
23 Claims
- 1. A process for preparing a powder of sucrose fatty acid esters, which comprises reacting sucrose with a fatty acid alkyl ester in an aqueous reaction system containing a catalyst to produce a sucrose fatty acid ester, adjusting the resulting reaction mixture to a neutral pH region, adding water and a neutral salt to the reaction mixture to precipitate the sucrose fatty acid ester product, separating the resulting precipitate from the liquid phase, washing the precipitate with an acidic water, subjecting the washing liquid to ultrafiltration, spray drying the resulting concentrate in the form of an aqueous solution, and recovering the unreacted sucrose by subjecting the liquid phase to reverse osmosis.
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