Process for purifying an aqueous solution comprising diethylacetal
US10463987B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 13, 2017 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Oct 13, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2011/002
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a process for purifying an aqueous solution comprising ethanol, acetaldehyde and diethylacetal comprising: a step A) of countercurrent liquid-liquid extraction comprising an extraction section supplied at the top by said aqueous solution as a mixture with at least one fraction of the water/ethanol/acetaldehyde raffinate resulting from the back extraction step B), and at the bottom by an extraction solvent, and producing an extract at the top and a purified feedstock at the bottom; —a step B) of countercurrent liquid-liquid back extraction comprising a back extraction section supplied at the top by an acidic aqueous solution, the pH of which is between 0.5 and 5, and at the bottom by the extract resulting from step A), and producing an extract at the top and a water/ethanol/acetaldehyde raffinate at the bottom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.