| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of separating and recovering acid from an effluent mixed with multiple acids capable of reaching a normal state for a short period of time from the starting of operation, keeping the operation state stable, recovering acetic acid at high recovery rate and purity, and having high throughput. SOLUTION: The method of separating and recovering acid has an acetic acid extraction process and an acetic acid exfoliation process. In the acetic acid extraction process, acetic acid is selectively dissolved in an extraction solvent by mixing the effluent containing acetic acid, nitric acid or/and hydrofluoric acid with the extraction solvent containing 8-12C alcohol and acetate of 8-12C alcohol. In the acetic acid exfoliation process, acetic acid is dissolved and moved in exfoliation water to separate and recover acetic acid by making acetic acid containing extraction solvent obtained in the extraction process contact with the exfoliation water. COPYRIGHT: (C)2006,JPO&NCIPI
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