Membrane contactors for the recovery of metallic compounds modelling of copper recovery from WPO processes

Abstract This work reports the comparative analysis of two types of separation processes aimed at the recovery of metallic compounds from residual waters by using hollow fiber modules as membrane contactors, i.e., emulsion pertraction, EPP, and non-dispersive solvent extraction, NDSX. As a representative example the recovery of the copper used as homogeneous catalyst in wet peroxide oxidation (WPO) processes is experimentally and theoretically analysed. The separation of the metal was enhanced by using LIX622N as selective extractant and its concentration took place in a concentrated sulphuric acid phase. Working with hollow fibers as membrane contactors, the mathematical modelling of the emulsion pertraction process is reported. Characteristic parameters have been determined as the membrane mass transfer coefficient, k m  = 2.2 × 10 −6  m s −1 , the equilibrium constant of the extraction/back-extraction reaction K EX  = 22, the forward reaction kinetic constant k 1  = 2.78 × 10 −7  m s −1 and the specific area of the globules of the stripping phase A v  = 2.54 × 10 4  m −1 . Finally, the results of copper separation and concentration have been compared to previous results obtained working with two hollow fiber modules, one for the extraction and the second for the back-extraction process and, as expected, a good agreement was observed. Two main advantages of the EPP could be underlined: (i) reduction of the needed membrane area of the contactor and (ii) higher concentrations in the stripping phase can be obtained with the operation conditions used (at laboratory scale).

[1]  E. Cussler,et al.  Reaction dependent extraction of copper and nickel using hollow fibers , 2000 .

[2]  I. Ortiz,et al.  Application of Hollow Fiber Membrane Contactors for Catalyst Recovery in the WPO Process , 2003, Annals of the New York Academy of Sciences.

[3]  P. Carr,et al.  Racemic leucine separation by hollow‐fiber extraction , 1992 .

[4]  Imona C. Omole Hollow-fiber membrane contactors , 1999 .

[5]  Su Lin,et al.  Mass-transfer in hollow-fiber modules for extraction and back-extraction of copper(II) with LIX64N carriers , 2001 .

[6]  W. S. Winston Ho,et al.  New membrane technology for removal and recovery of chromium from waste waters , 2001 .

[7]  K. Sirkar,et al.  Membrane solvent extraction removal of priority organic pollutants from aqueous waste streams , 1992 .

[8]  Á. Irabien,et al.  Separation of L-Phenylalanine by Nondispersive Extraction and Backextraction. Equilibrium and Kinetic Parameters , 1998 .

[9]  Inmaculada Ortiz,et al.  Experimental and Theoretical Analysis of a Nondispersive Solvent Extraction Pilot Plant for the Removal of Cr(VI) from a Galvanic Process Wastewaters , 1999 .

[10]  M. Harada,et al.  Kinetic mechanism of metal extraction with hydroxyoximes , 1989 .

[11]  J. Szymanowski Hydroxyoximes and Copper Hydrometallurgy , 1993 .

[12]  Edward L Cussler,et al.  Liquid-liquid extractions with microporous hollow fibers , 1986 .

[13]  Edward L Cussler,et al.  How to Design Liquid Membrane Separations , 1974 .

[14]  R. W. Callahan,et al.  Liquid-liquid extraction and stripping of gold with microporous hollow fibers , 1987 .

[15]  Edward L Cussler,et al.  CONCENTRATING CHROMIUM WITH LIQUID SURFACTANT MEMBRANES. , 1975 .

[16]  Edward L Cussler,et al.  Diffusion: Mass Transfer in Fluid Systems , 1984 .

[17]  K. Sirkar,et al.  Separation of solutes from aqueous solutions by contained liquid membranes , 1988 .

[18]  Edward L Cussler,et al.  Hollow Fiber Contactors , 1994 .

[19]  K. Sirkar,et al.  Solvent extraction with immobilized interfaces in a microporous hydrophobic membrane , 1984 .

[20]  B. Galán,et al.  Kinetics of separating multicomponent mixtures by nondispersive solvent extraction: Ni and Cd , 2001 .

[21]  G. Stevens,et al.  Innovations in separations technology for the recycling and re-use of liquid waste streams , 2001 .

[22]  R. Reid,et al.  The Properties of Gases and Liquids , 1977 .

[23]  Ana M. Eliceche,et al.  Modeling and Optimization of an Emulsion Pertraction Process for Removal and Concentration of Cr(VI) , 2003 .

[24]  Á. Irabien,et al.  Extraction of Cr(VI) with aliquat 336 in hollow fiber contactors: mass transfer analysis and modeling , 1994 .

[25]  H. Takeuchi,et al.  Some observations on the stability of supported liquid membranes , 1987 .

[26]  K. Sirkar,et al.  Hollow fiber contained liquid membrane separation of citric acid , 1991 .

[27]  A. Urtiaga,et al.  Internal mass transfer in hollow fiber supported liquid membranes , 1993 .

[28]  Su Lin,et al.  Removal of free and chelated Cu(II) ions from water by a nondispersive solvent extraction process. , 2002, Water research.

[29]  K. Sirkar,et al.  Hollow fiber solvent extraction removal of toxic heavy metals from aqueous waste streams , 1993 .

[30]  A. Urtiaga,et al.  Supported liquid membranes for the separation-concentration of phenol. 2. Mass-transfer evaluation according to fundamental equations , 1992 .

[31]  K. Sirkar,et al.  Lipase-facilitated separation of organic acids in a hollow fiber contained liquid membrane module , 2000 .

[32]  Á. Irabien,et al.  Kinetic modelling of cadmium removal from phosphoric acid by non-dispersive solvent extraction , 1997 .

[33]  K. Sirkar,et al.  Dispersion‐free solvent extraction with microporous hollow‐fiber modules , 1988 .

[34]  J. Wiencek,et al.  Emulsion-liquid-membrane extraction of copper using a hollow-fiber contactor , 1998 .

[35]  E. Drioli,et al.  Coupled transport of amino acids through a supported liquid membrane. I. Experimental optimization , 1992 .

[36]  Enrico Drioli,et al.  Metal ion separation and concentration with supported liquid membranes , 1986 .

[37]  K. Sirkar,et al.  Nondispersive membrane solvent back extraction of Phenol , 1990 .