Process for producing difructose dianhydride III crystals

Details Process for producing difructose dianhydride III crystals Process for producing difructose dianhydride III crystals

2004-12-28

2011-10-18

Bland, Layla (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S123130, C536S126000

Reexamination Certificate

active

08039615

ABSTRACT:
The invention provides a process for producing the crystals of difructose dianhydride III (DFA III), namely a indigestible disaccharide where two fructose molecules are bonded to each other at positions 1,2′ and 2,3′ (di-D-fructofuranose-1,2′,2,3′-dianhydride), where solutions containing DFA III are adjusted to and/or maintained at pH 5 or more, preferably pH 5 to 8, and more preferably 6 to 8. In accordance with the invention, DFA III can be produced industrially without lowering the crystal yield even when the crystallization thereof is done in a recycling system; additionally by adjusting the total fructose content in mother solutions for (crude) crystallization to 5% or less per a solid content basis and adjusting the fructose content to 1% or less, DFA III can more effectively be produced.

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