Process for purifying sucrose fatty acid esters
First Claim
1. A process for removing a volatile material from a reaction mixture in synthesis of a sucrose fatty acid ester by a reaction of sucrose and a fatty acid alkyl ester in an organic solvent, said reaction mixture containing sucrose fatty acid ester, unreacted sucrose, unreacted fatty acid alkyl ester, a catalyst, a soap, a fatty acid and the organic solvent as a volatile material, which comprises adjusting the reaction mixture to a neutral pH region, adding water, a neutral salt and sucrose to the reaction mixture to transfer the volatile material into the aqueous phase with precipitation of the sucrose fatty acid ester, unreacted fatty acid alkyl ester, soap and fatty acid, and separating the resulting precipitate.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for purifying sucrose fatty acid esters included in a reaction mixture formed by a reaction of sucrose and a fatty acid alkyl ester in an organic solvent as reaction medium in the presence of a catalyst, which comprises adjusting the reaction mixture from which a part of the organic solvent as reaction medium may be previously removed and to which water is added to form an aqueous solution, to a neutral pH region, adding a neutral salt and sucrose to the solution to precipitate the sucrose fatty acid ester, filtering off the precipitate, and washing the precipitate with an acidic water. The washed precipitate in the form of slurry is spray-dried to form a dry powder, and the filtrate is contacted with a reverse osmosis membrane to recover sucrose. According to the invention, purified sucrose fatty acid esters can be obtained from the reaction mixture without using an organic solvent as purification solvent, while sucrose can be recovered in high yield.
-
Citations
25 Claims
- 1. A process for removing a volatile material from a reaction mixture in synthesis of a sucrose fatty acid ester by a reaction of sucrose and a fatty acid alkyl ester in an organic solvent, said reaction mixture containing sucrose fatty acid ester, unreacted sucrose, unreacted fatty acid alkyl ester, a catalyst, a soap, a fatty acid and the organic solvent as a volatile material, which comprises adjusting the reaction mixture to a neutral pH region, adding water, a neutral salt and sucrose to the reaction mixture to transfer the volatile material into the aqueous phase with precipitation of the sucrose fatty acid ester, unreacted fatty acid alkyl ester, soap and fatty acid, and separating the resulting precipitate.
- 12. A process for purifying a sucrose fatty acid ester included in a reaction mixture formed by a reaction of sucrose and a fatty acid alkyl ester in an organic solvent, which comprises adjusting the reaction mixture to a neutral pH region, adding water, a neutral salt and sucrose to the reaction mixture to precipitate the sucrose fatty acid ester, separating the resulting precipitate from the liquid phase, and washing the precipitate with an acidic water.
Specification