Sorption and extraction of lactic and succinic acids at pH > pK[sub a1]. 1: Factors governing equilibria

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00036a041· OSTI ID:6620543

Tung, L A; King, C J ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

Many fermentation to produce carboxylic acid operate most effectively at pH above pK[sub a1] of the acid product, under which conditions the acid is largely in the carboxylate form. One approach to acid recovery from such solutions is to use solid sorbents or liquid extractants that are strongly enough basic to provide substantial capacity even at moderately high values of pH. Data are presented for sorption of lactic and succinic acids by several commercially available basic polymeric sorbents. Performance at pH > pK[sub a1] is a function of sorbent basicity, and apparent pK[sub a] or monomer pK[sub a] can be used to predict sorbent performance. Data are also presented for the extraction of the acids by two commercial amine extractants, Alamine 336 and Amberlite LA-2, in various diluents. The extractants sustain capacity to higher pH in diluents that stabilize the acid-amine complex. Secondary amines provide higher capacities than do tertiary amines in diluents that solvate the additional proton. Competitive uptakes of sulfate, phosphate, and carboxylate were also measured.

• OSTI ID: 6620543
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 33:12; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
ADSORBENTS
PERFORMANCE
LACTIC ACID
ADSORPTION
SOLVENT EXTRACTION
SOLVENTS
SUCCINIC ACID
AMINES
EQUILIBRIUM
PH VALUE
SEPARATION PROCESSES
CARBOXYLIC ACIDS
DICARBOXYLIC ACIDS
EXTRACTION
HYDROXY ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
SORPTION
090900* - Biomass Fuels- Processing- (1990-)