Recovery and refining of dianhydrosugars
US9765084B2 · kind B2 · utility
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15References
8Claims
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Key dates
| Filing date | Apr 9, 2009 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Apr 9, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07H1/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of a refined dianhydrosugar-containing product is disclosed. The process includes controlled continuous crystallization of the dianhydrosugar-containing product to produce a solution saturated with the dianhydrosugar. The saturated solution is mechanically separated, for example by centrifugation, and the crystalline product is washed. The only solvent used is water. The dianhydrosugar-containing product is upgraded to at least 99.8% purity and recovery is 95% or greater.Recrystallization of the dianhydrosugar of 99.8% purity results in an ultra pure product containing at least 99.99% dianhydrosugar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.