Process for purifying difructose dianhydride III
US7998710B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2004 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Mar 19, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12P19/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In the invention, highly pure crystals of difructose dianhydride III (di-D-fructofuranose-1,2′:2,3′-dianhydride; hereinafter referred to as DFA III) are produced by adding 5% or less of powdered active carbon to a DFA III containing purified solution containing DFA III of 90% or more purity at a concentration of R-Bx 10-60, preferably 40-55, and after stirring, applying the mixture to solid-liquid separation (filtration with diatomaceous, filtration through a membrane filter, ultrafiltration, or continuous centrifugal separation) and concentrating the separated liquid part, followed by immediate crystallization.In the process of the invention, DFA III crystals can be produced efficiently and industrially, and the resulting crystals can be used for various purposes in pharmaceuticals or food and drink since they have no smell. This is characteristics of the invention different from the prior art products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.