METHOD OF USING RECYCLED MOTHER LIQUORS TO PRODUCE ALDOSIDES

摘要

Case 79009 METHOD OF USING RECYCLED MOTHER LIQUORS TO PRODUCE ALDOSIDES The present invention relates to the preparation of aldoside mixtures, recovering at least a portion of one aldoside component therefrom and reusing the remaining portion of the aldoside mixture prepare additional aldoside. The aldoside mixture may be prepared by slurrying the carbohydrate in alcohol and passing the slurry through a continuous reactor at an elevated temperature under fluid pressure in the presence of an acid catalyst. The resultant aldoside mixture may then be partitioned into a mother liquor portion and an aldoside portion by selectively recovering at least a portion of one aldoside from the crude aldoside mixture with the remaining mother liquor being recycled. Crude glycoside mixtures prepared from starch and methanol slurries are suitable substrates for selectively recovering methyl-alpha- D-gluocpyrenoside. The methyl-alpha-D-gluccpyranoside may be easily crystallized and recovered from the glycoside mixture because of its lower solubility in methanol. me resultant mother liquor (rich in the ramaining components of the glycoside mixture) in combination with freshly added starch and methanol provides a reaction medium which optimizes methyl-alpha-D-glucopyranoside production.