Patent ID: 9580455
Date: 2017-02-28
CPC Classifications: C07H

Claim:
1. A method for recovery of initially not separated β-acetylfuranoside from mother liquor remaining from the synthesis of acetylfuranoside (ACF), comprising the following sequential steps: a) Evaporation to less than 1% residual solvent of the mother liquor remaining from an initial synthesis of ACF, to increase the content of residual α/β-ACF from about 8 to 15 weight-% to about 25 to 45 weight-%, followed by distillation to about 60 to 80 weight- and subsequent crystallization of β-ACF out of the distillate by adding a suitable solvent; b) Chemical conversion of α/β-ACF mixture remaining in the mother liquor of step a), to β-ACF by de-acetylation and subsequent re-acetylation, followed by crystallization of β-ACF by addition of a suitable solvent; c) Optional repetition of step a) and b) in a sequential (clockwise) cyclic process; wherein the distillation to about 60 to 80 weight-% of step a) is carried out at 1 to 3 mbar and 200 to 210° C. heating temperature in a continuous thin film evaporator.