Process for the recovery of carboxylic acid and wood treatment process
US9856202B2 · kind B2 · utility
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21Claims
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Key dates
| Filing date | May 6, 2015 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | May 6, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K3/346
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for the recovery of carboxylic acid, in particular acetic acid containing carboxylic anhydride in particularacetic anhydride and other impurities, which comprises: (a) treating a fraction, in particular a fraction originating from a wood treatment process, containing carboxylic acid and impurities with a metal salt in the presence of water, (b) treating at least part of the fraction obtained from step (a) to remove metal salt and, (c) treating at least part of the fraction obtained from step (b) by distillation, stripping or membrane separation to recover at least a purified carboxylic acid fraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.