Hydrodynamics and mass transfer in a rotating disk supercritical extraction column

Antero Laitinen (Corresponding Author), Juha Kaunisto

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    Abstract

    A novel rotating disk column (RDC) designed for high-pressure extraction was tested by extracting ethanol from aqueous solutions using supercritical carbon dioxide at 10 MPa and 313 K as a solvent.
    Mass-transfer efficiencies and hydraulic characteristics were measured as functions of a specific power input group (N3R5H-1D-2) and solvent-to-feed ratio. Agitation generally increased the value of the overall mass-transfer coefficient (Koda) and decreased the value of the height equivalent to a theoretical stage (HETS). The Koda values ranged from 0.006 to 0.015 s-1, and the HETS values ranged from 0.37 to 0.8 m.
    The dispersed-phase drop size decreased with the agitator rotor speed. The measured values were between 1.3 and 1.8 mm. Agitation and increasing solvent flow rate increased the dispersed-phase holdup from 0.04 to 0.2. The measured slip velocities ranged from 0.08 to 0.14 m s-1.
    The highest total throughput of the RDC column was approximately 74 m3 h-1 m-2.
    Original languageEnglish
    Pages (from-to)2529-2534
    JournalIndustrial & Engineering Chemistry Research
    Volume37
    Issue number6
    DOIs
    Publication statusPublished - 1998
    MoE publication typeA1 Journal article-refereed

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