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Comparison of solvent extraction and LEM extraction in static mixer for recovery of Mo(VI) from dilute aqueous solution

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Title Comparison of solvent extraction and LEM extraction in static mixer for recovery of Mo(VI) from dilute aqueous solution
 
Creator DAS, D
JUVEKAR, VA
RAMPRASAD, K
BHATTACHARYA, R
 
Subject LIQUID-LIQUID-EXTRACTION
MASS-TRANSFER
MOLYBDENUM
ACID
TBP
TOPO
Liquid emulsion extraction (LEM)
Static mixer
Mo(VI)
TBP
Height of transfer units (HTU)
 
Description In this paper, the liquid emulsion membrane extraction of molybdenum(VI) has been conducted in static mixer. The performance in LEM mode is compared to a conventional solvent extraction mode. The rate of extraction in LEM mode is found to be significantly higher than conventional solvent extraction. Study reveals that the optimum residence time, height of the static mixer and optimum surfactant concentration are the deciding parameters of the performance of static mixer. The effect of various parameters such as superficial velocity of aqueous phase and organic phase, residence time, initial Mo(VI) concentration in feed phase, height of column, and surfactant concentration on rate of extraction has been investigated. A mathematical model is developed to predict volumetric mass transfer coefficient (k(L)a) in a static mixer. The k(L)a value is reduced from 0.045 s(-1) to 0.015 s-1 when height of the mixer was increased from 31 cm to 93 cm respectively under the same hydrodynamic conditions. This anomalous decrease of k(L)a with increase in height is due to acid extraction by TBP which reduces driving force for extraction of Mo(VI). HTU for solvent extraction and LEM extraction are estimated as 0.67 m and 0.15 m respectively which indicates less mass transfer resistance in LEM. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2016-01-14T13:15:32Z
2016-01-14T13:15:32Z
2015
 
Type Article
 
Identifier CHEMICAL ENGINEERING AND PROCESSING, 95,372-382
0255-2701
1873-3204
http://dx.doi.org/10.1016/j.cep.2015.07.012
http://dspace.library.iitb.ac.in/jspui/handle/100/17590
 
Language en