| 摘要 |
<p>A sugar ester product is manufactured from sugar and vinyl fatty acid. Sugar is first dissolved in dimethyl sulfoxide with a metal carbonate catalyst. A vinyl fatty acid ester is added to the sugar mixture; a sugar ester product and acetaldehyde are formed. Vacuum can be used to remove acetaldehyde to drive the reaction towards completion. Depending on the sugar to vinyl fatty acid ester ratio, one can obtain a reaction yield greater than 90% with a monoester content of 90%. DMSO is then recovered by vacuum distillation. The crude product is dissolved in brine; sucrose stearate along with vinyl stearate and traces of sucrose are extracted by adding isobutanol. The isobutanol phase is separated from the aqueous phase and concentrated. Spray drying steps are carried out to remove residual solvents and vinyl stearate. The product is a white powder that meets FDA specifications for sucrose esters.</p> |
