Regeneration of carboxylic acid-amine extracts by back-extraction with an aqueous solution of a volatile amine

Journal Article · Wed May 01 04:00:00 EDT 1991 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00053a015· OSTI ID:7176716

Poole, I J; King, C J ^[1]

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1. Dept. of Chemical Engineering and Lawrence Berkeley Lab., Univ. of California, Berkeley, CA (US)

Tertiar amines are effective extractants for the recovery of carboxylic acids from aqueous solution. An approach for regeneration and product recovery from such extracts is to back-extract the carboxylic acid with a water-soluble, volatile tertiary amine, such as trimethylamine. The resulting trimethylammonium carboxylate solution can be concentrated and thermally decomposed, yielding the product acid and the volatile amine for recycle. In this paper, equilibrium data are presented that show near-stoichiometric recovery of carboxylic acids for amine extracts. For rumaric and succinic acids, partial evaporation of the aqueous back-extract decomposes the carboxylate and yields the acid product in crystalline form. The decomposition of aqueous solutions of trimethylammonium lactates stops short of forming the acid product, because of its greater water solubility and tendency for self-association. Methods of further purifying the crystals are evaluated along the processing implications of the results.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7176716
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 30:5; ISSN 0888-5885; ISSN IECRE
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
AMINES
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHEMICAL REACTION KINETICS
DISPERSIONS
EXTRACTION
KINETICS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION