Separation of certain carboxylic acids utilizing cation exchange

Details Separation of certain carboxylic acids utilizing cation exchange Separation of certain carboxylic acids utilizing cation exchange

1983-05-09

1984-10-09

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

2105002, B01D 1300

Patent

active

044760256

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.

REFERENCES:
patent: 4075093 (1978-02-01), Walch et al.

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