Nippon Beet Sugar Manufacturing., Co., Ltd.

Katsuya Honjyo

Tsutomu Aritsuka

Hiroto Kikuchi

Taizo Nagura

Norimitsu Takagi

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&#x2032; (di-D-fructofuranose-1,2&#x2032;:2,3&#x2032;-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. 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.

Process for producing difructose dianhydride III crystals

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&#x2032; (di-D-fructofuranose-1,2&#x2032;,2,3&#x2032;-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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Obihiro, Japan

Katsuya Honjyo