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Title: Separation of certain carboxylic acids utilizing cation exchange membranes

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.

Inventors:
 [1];  [2]
  1. (Arvada, CO)
  2. (Maarssenbroek, NL)
Issue Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
OSTI Identifier:
865184
Patent Number(s):
4476025
Assignee:
United States of America as represented by United States (Washington, DC) NREL
DOE Contract Number:  
EG-77-C-01-4042
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Chum, Helena L., and Sopher, David W. Separation of certain carboxylic acids utilizing cation exchange membranes. United States: N. p., 1984. Web.
Chum, Helena L., & Sopher, David W. Separation of certain carboxylic acids utilizing cation exchange membranes. United States.
Chum, Helena L., and Sopher, David W. Sun . "Separation of certain carboxylic acids utilizing cation exchange membranes". United States. https://www.osti.gov/servlets/purl/865184.
@article{osti_865184,
title = {Separation of certain carboxylic acids utilizing cation exchange membranes},
author = {Chum, Helena L. and Sopher, David W.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Patent:

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