Process for manufacturing dianhydrohexitol crystals with a step of evaporative crystallization of the first crystallization mother liquors
US10526340B2 · kind B2 · utility
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Key dates
| Filing date | Apr 21, 2017 |
| Grant date | Jan 7, 2020 |
| Priority date | — |
| Expiry date | Apr 21, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D493/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for manufacturing crystals of 1,4:3,6-dianhydrohexitols, by manufacturing a solution of an internal dehydration product of at least one hexitol, distilling the solution, crystallizing, and wherein the crystallization mother liquors undergo a step of evaporative crystallization. Unlike the prior art processes that seek to recycle the crystallization mother liquors, evaporative crystallization economically and efficiently replaces the succession of steps consisting of at least one concentration, then at least one step of purification by distillation, chromatography, or crystallization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.