FIELD: chemistry.
SUBSTANCE: invention relates to a method of extracting a carboxylic acid, in particular acetic acid containing carboxylic anhydride, in particular acetic anhydride, as well as other impurities, which includes (a) treating the fraction, in particular a fraction obtained from a wood processing process containing a carboxylic acid and impurities with a metal salt, in the presence of water, (b) treating at least a portion of the fraction obtained at step (a) to remove metal salt and (c) treating at least a portion of the fraction obtained in step (b) by distillation or withdrawal from the gaseous phase to recover at least the purified carboxylic acid fraction, wherein water is added to the fraction obtained in step (b), before step (c).
EFFECT: invention also relates to a method of producing treated wood, in particular acetylated wood.
14 cl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING CARBOXYLIC ACID ANHYDRIDE | 2015 |
|
RU2732578C2 |
| METHOD OF EXTRACTING CARBOXYLIC ACID AND METHOD OF TREATING WOOD | 2015 |
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| METHOD FOR CONTINUOUS PRODUCING ACETIC ACID (VARIANTS) AND METHOD FOR TREATMENT OF ACETIC ACID FLOW | 2002 |
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|
RU2358966C2 |
| METHOD OF WOOD ACETYLATION | 2016 |
|
RU2719997C2 |
| METHOD OF DECREASE AND/OR REMOVAL OF PERMANGANATE-REDUCING COMPOUNDS AND C- ALKYLIODIDE COMPOUNDS | 1997 |
|
RU2181715C2 |
