Phosphonic acid catalyst in dehydrative cyclization of 5 and 6 carbon polyols with improved color and product accountability
US9856195B2 · kind B2 · utility
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Key dates
| Filing date | Dec 12, 2014 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Dec 12, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/007
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for preparing cyclic dehydration products from sugar alcohols is described. The process involve using a mixed-acid catalyst reaction mixture containing a reducing acid, having a pKa of about 1.0-1.5, and at least a strong Brønsted acid or a Lewis acid, having a pKa≦0, or both acids in a solution to dehydrate and ring close said sugar alcohol. Synergistically, the mixed-acid catalysis can produce greater amounts of the desired product at similar levels of compositional accountability than either of the component acid catalysts acting alone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.