Hydrodynamics and Mass Transfer in a Rotating Disk Supercritical Extraction Column

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 (N 3 R 5 H -1 D -2) and solvent-to-feed ratio. Agitation generally increased the value of the overall mass-transfer coefficient (K od a) and decreased the value of the height equivalent to a theoretical stage (HETS). The K od a 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.

Ethanol and aroma compounds transfer study for partial dealcoholization of wine using membrane contactor

“…4, the experimental values of the overall mass transfer coefficient for ethanol, k EtOH G , are shown, calculated according to Eq. (11). The individual contributions to overall mass transfer coefficient are also given through the representation of the mass transfer resistances R f , R m and R s , calculated from Eq.…”

“…Other technologies such as adsorption on zeolites [10] and supercritical fluid extraction [11,12] are being studied in the literature as possible alternatives to reduce the alcoholic content in beverages. Membrane technologies such as vacuum distillation [13,14], pervaporation [15][16][17] and dialysis [14] are also proposed to dealcoholize wine.…”

Acid Gas Extraction of Pyridine from Water

“…The concentration deviations in the consecutive feed and raffinate samples were typically within 2%. More information about the experimental procedure is available in a recent paper …”

Modeling and simulation of supercritical extraction columns using computer algebra

“…These columns may be modeled using various levels of detail, ranging from models that take into account mass transfer and hydrodynamics in the column [2] to models that assume phase equilibrium at each stage [3]. This work follows the latter assumption and uses the Newton-Raphson method in the simultaneous solution of the model equations [3][4][5][6].…”