الفهرس 
THEORITICALOnly 14 pages are availabe for public view
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Abstract
The present work is concerned with a study of the factors affecting the rate of extraction of copper from aqueous solutions by naphthenic acids using a plexi-glass laboratory- scale spray column as a means for enhancing the rate of mass transfer between the aqueous and the organic phases. Extraction of cupric ions by naphthenic acids has been previously investigated in numerous ways other than using a spray column. Variables studied were : copper ion concentration, phase ratio, temperature and volumetric flow rate of solution. Napthenic acids were dissolved in kerosene and their concentration kept constant throughout the work at a value of 0.1 molar. The investigation proved the following results: the rate of mass transfer and the rate of extraction were found to increase with the temperature according to the arrhenius equation in which the activation energy of the extraction process was found to be 155 kcal/mol denoting a chemical controlled process, and were found to decrease with increase in the aqueous to organic phase ratio and to increase with increasing the copper ion concentration in the aqueous phase and with increase in volumetric flow rate of solution. The overall mass transfer of the extraction process was investigated to correlate the present data in terms of the dimensionless groups Sh, Re and Sc, and were found to fit the equation:
Sh = 404.8 Re0.504 Sc0.33
The values of these three groups were calculated and ranged as follows:
280 < Re < 4800
30,902 < Sh < 331203
1251 < Sc < 1421
The technical importance of the present work lies in the area of copper purification and extraction from iow grade ores and waste streams resulting from metal finishing industry.