Separation of certain carboxylic acids utilizing cation exchange membranes

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:865184

Chum, Helena L ^[1]; Sopher, David W ^[2]

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1. Arvada, CO
2. Maarssenbroek, NL

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.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• DOE Contract Number: EG-77-C-01-4042
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4476025
• OSTI ID: 865184
• Country of Publication: United States
• Language: English

Related Subjects

separation
carboxylic
acids
utilizing
cation
exchange
membranes
method
substantially
separating
monofunctional
liquid
mixture
containing
ph
adjusted
value
range
form
protonated
heated
elevated
temperature
100
degree
brought
contact
perfluorinated
membrane
sulfonate
carboxylate
mixtures
pressure
gradient
established
pass
faster
rate
remainder
liquid mixture
cation exchange
mixture containing
elevated temperature
carboxylic acids
carboxylic acid
exchange membrane
faster rate
exchange membranes
pressure gradient
/210/