Acid gas extraction of pyridine from water

Antero Laitinen (Corresponding Author), Olli Jauhiainen

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)


    Pyridine was extracted from aqueous solutions initially containing 5 or 15 wt % pyridine by using liquid or supercritical carbon dioxide at 10 MPa as a solvent in a mechanically agitated countercurrent extraction column. The lowest pyridine concentration in the raffinate was 0.06 wt %, whereas the pyridine concentration in the extract was 86−94 wt %. From the initial amount of pyridine, 96−99% was transferred from the feed stream to the extract by using relatively small solvent-to-feed ratios of 2.8−4.6 (kg of solvent/kg of feed). The measured distribution coefficients for the water/pyridine/carbon dioxide system ranged from 0.3 to 1 (weight units), depending on the initial pyridine concentration in water. Carbon dioxide is a particularly suitable solvent for the extraction of pyridine from concentrated aqueous solutions. The efficiency may be the result of an acid−base interaction between weakly basic pyridine solute and weakly acidic carbon dioxide solvent in an aqueous environment.
    Original languageEnglish
    Pages (from-to)168 - 174
    Number of pages7
    JournalIndustrial & Engineering Chemistry Research
    Issue number1
    Publication statusPublished - 2000
    MoE publication typeA1 Journal article-refereed


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