Hydrodynamics and Mass Transfer in a Rotating Disk Supercritical Extraction Column
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- 作者：Antero Laitinen and and Juha Kaunisto
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1998
- 出版时间：June 1998
- 年：1998
- 卷：37
- 期：6
- 页码：2529 - 2534
- 全文大小：80K
- 年卷期：v.37,no.6(June 1998)
- ISSN：1520-5045
文摘
A novel rotating disk column (RDC) designed for high-pressureextraction was tested byextracting ethanol from aqueous solutions using supercritical carbondioxide at 10 MPa and313 K as a solvent. Mass-transfer efficiencies and hydrauliccharacteristics were measured asfunctions of a specific power input group(N3R5H-1D-2)and solvent-to-feed ratio. Agitationgenerally increased the value of the overall mass-transfer coefficient(Koda) and decreased thevalue of the height equivalent to a theoretical stage (HETS). TheKoda values ranged from0.006to 0.015 s-1, and the HETS values ranged from0.37 to 0.8 m. The dispersed-phase drop sizedecreased with the agitator rotor speed. The measured values werebetween 1.3 and 1.8 mm.Agitation and increasing solvent flow rate increased thedispersed-phase holdup from 0.04 to0.2. The measured slip velocities ranged from 0.08 to 0.14 ms-1. The highest totalthroughputof the RDC column was approximately 74 m3h-1m-2.