Separation of certain carboxylic acids utilizing cation exchange membranes
US4476025A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1983 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | May 9, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2311/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of substantially separating monofunctional lower carboxylic acids from a liquid mixture containing the acids wherein the pH of the mixture is adjusted to a value in the range of from about 1 to about 5 to form protonated acids. The mixture is heated to an elevated temperature not greater than about 100.degree. C. and brought in contact with one side of a perfluorinated cation exchange membrane having sulfonate or carboxylate groups or mixtures thereof with the mixture containing the protonated acids. A pressure gradient can be established across the membrane with the mixture being under higher pressure, so that protonated monofunctional lower carboxylic acids pass through the membrane at a substantially faster rate than the remainder of the mixture thereby substantially separating the acids from the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.