PERFORMANCE OF JET PLATES IN PULSED LIQUID-LIQUID EXTRACTION COLUMNS.
作者:
L. STEINER,
M. LASO,
J. BERGER,
S. HARTLAND,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1994)
卷期:
Volume 12,
issue 1
页码: 155-172
ISSN:0736-6299
年代: 1994
DOI:10.1080/07366299408918206
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Jet plates with elevated rims around their openings are assumed to improve the performance of pulsed extraction columns. A comparison with conventional plates was carried out in a pilot-plant size column with the system of water, toluene and acetone. Hold-up, drop size, backmixing and axial concentration profiles in both phases were measured simultaneously. Mass transfer coefficients were evaluated from measured data by minimising the deviations of measured concentration profiles from model prediction using standard and open-end stagewise backflow models. Equations from the literature for prediction of drop size, hold-up and backmixing coefficients were modified by recalculating the empirical coefficients from recent data to enable quantification of trends and replacement of missing values. The transfer coefficents correlated against actual velocity of the dispersed phase rised to a power between 0.6 and 1, the influences of pulsation velocity, drop size and actual velocity of the continuous phase being by an order of magnitude smaller. The magnitude of the transfer coefficients was comparable to those measured earlier under similar conditions in a reciprocating plate extraction column where, however, the mentioned additional influences were more important.
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