Process for producing difructose dianhydride III crystals
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United States of America Patent
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Nov 6, 2012
Grant Date -
Dec 8, 2011
app pub date -
Aug 16, 2011
filing date -
Dec 28, 2004
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Abstract
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. 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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