Liquid CO.sub.2 /cosolvent extraction
US4770780A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1984 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Apr 25, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/0407
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed are a fluid extractant, and a process and apparatus for using the extractant to separate an organic liquid from an aqueous mixture. The extractant comprises a first fluid solvent which is a gas in its near-critical or supercritical state and a cosolvent. A preferred first fluid solvent is near-critical liquid carbon dioxide. Preferred cosolvents are 2-ethyl hexanol for ethanol extraction, and hexanoic acid for acetic acid extraction. Organic compounds such as monohydric alcohols, monoacids, ketones, ethers, aldehydes and esters can be recovered from dilute aqueous solutions more economically than possible by prior art processes of distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.