| 摘要 |
This invention relates to a method of obtaining sucralose from a feed mixture comprising 6-O-acyl-4,1',6'- trichloro-4,1',6'-trideoxygalactosucrose, other chlorinated sucrose byproducts, and optionally blocked or partially blocked chlorinated sucrose byproducts comprising the steps of: (a) performing a non-crystallization extraction step on said feed mixture to obtain an increased purity 6-O-acyl-4,1',6'-trichloro-4,1',6'-trideoxygalactosucrose composition; (b) performing a crystallization procedure on said increased purity 6-O-acyl-4,1',6'-trichloro-4,1',6'-trideoxygalactosucrose composition to obtain 6-O-acyl-4,1',6'-trichloro-4,1',6'-trideoxygalactosucrose and a mother liquor; (c) performing at least three additional sequential crystallizations of the 6-O-acyl- 4, 1',6'-trichloro-4, 1',6'-trideoxygalactosucrose to obtain a substantially pure 6-O-acyl-4,1',6'-trichloro-4,1',6'-trideoxygalactosucrose and additional mother liquor; and (d) converting said substantially pure 6-O-acyl-4,1',6'-trichloro-4,1',6'-trideoxygalactosucrose to substantially pure sucralose;
or the steps of: (a) performing a non-crystallization extraction step on said feed mixture to obtain an increased purity sucralose precursor stream; (b) converting said 6-O-acyl-4,1',6'-trichloro-4, 1',6'-trideoxygalactosucrose in said increased purity sucralose precursor stream to sucralose; (c) crystallizing said sucralose to obtain a crystalline sucralose and a mother liquor; and (d) performing at least three additional sequential crystallizations of said crystalline sucralose to obtain a substantially pure sucralose and additional mother liquor. |
