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.
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 language | English |
|---|---|
| Pages (from-to) | 2529-2534 |
| Journal | Industrial & Engineering Chemistry Research |
| Volume | 37 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1998 |
| MoE publication type | A1 Journal article-refereed |