Oligomer distribution in concentrated lactic acid solutions

Dung T. Vu, Aspi K. Kolah, Navinchandra S. Asthana, Lars Peereboom, Carl T. Lira, Dennis J. Miller

    Research output: Research - peer-reviewArticle

    • 43 Citations

    Abstract

    Lactic acid (2-hydroxypropanoic acid) is a significant platform chemical for the biorenewable economy. Concentrated aqueous solutions of lactic acid (>30 wt.%) contain a distribution of oligomers that arise via intermolecular esterification. As a result, the titratable acidity changes non-linearly with acid concentration. In this work, the oligomer distribution of lactic acid is characterized using GC, GC/MS, and HPLC to extend existing literature data, and titratable acidity is measured via titration with NaOH. A thermodynamic model with a single parameter is proposed that accurately represents oligomer distribution and titratable acidity over the full range of lactic acid concentrations.

    LanguageEnglish (US)
    Pages125-135
    Number of pages11
    JournalFluid Phase Equilibria
    Volume236
    Issue number1-2
    DOIs
    StatePublished - Sep 20 2005

    Profile

    lactic acid
    oligomers
    Lactic acid
    Oligomers
    Lactic Acid
    acidity
    Acidity
    acids
    Acids
    economy
    titration
    platforms
    aqueous solutions
    thermodynamics
    Esterification
    Titration
    Thermodynamics

    Keywords

    • 2-Hydroxypropionic acid
    • Alpha-hydroxy acid
    • Chemical theory
    • Esterification
    • Lactic acid
    • Oligomerization

    ASJC Scopus subject areas

    • Fluid Flow and Transfer Processes
    • Physical and Theoretical Chemistry

    Cite this

    Oligomer distribution in concentrated lactic acid solutions. / Vu, Dung T.; Kolah, Aspi K.; Asthana, Navinchandra S.; Peereboom, Lars; Lira, Carl T.; Miller, Dennis J.

    In: Fluid Phase Equilibria, Vol. 236, No. 1-2, 20.09.2005, p. 125-135.

    Research output: Research - peer-reviewArticle

    Vu, DT, Kolah, AK, Asthana, NS, Peereboom, L, Lira, CT & Miller, DJ 2005, 'Oligomer distribution in concentrated lactic acid solutions' Fluid Phase Equilibria, vol 236, no. 1-2, pp. 125-135. DOI: 10.1016/j.fluid.2005.06.021
    Vu DT, Kolah AK, Asthana NS, Peereboom L, Lira CT, Miller DJ. Oligomer distribution in concentrated lactic acid solutions. Fluid Phase Equilibria. 2005 Sep 20;236(1-2):125-135. Available from, DOI: 10.1016/j.fluid.2005.06.021
    Vu, Dung T. ; Kolah, Aspi K. ; Asthana, Navinchandra S. ; Peereboom, Lars ; Lira, Carl T. ; Miller, Dennis J./ Oligomer distribution in concentrated lactic acid solutions. In: Fluid Phase Equilibria. 2005 ; Vol. 236, No. 1-2. pp. 125-135
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