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Unformatted text preview: University of California, Davis Department of Chemical Engineering and Materials Science ECH 157 Process Dynamics and Control Ahmet Palazoglu EXAM 1 Fall 2009 ( Open book and no notes ) 1. (7 pts) The aim of the copper solvent extraction process 1 is to concentrate aqueous copper solution from a few g/l to about 4050 g/l and to purify the solution from ferrous, manganese, chloride and other impurities, which are harmful for the downstream electrowinning process. This continuous process consists of extraction and stripping processes, both of which may contain several unit operations. In the extraction units, copper is transferred from the mildly acid aqueous leach solution to the organic solution. In the stripping units, copper is transferred from the organic solution to the strongly acid aqueous electrolyte solution. In industry, the process equipment is solely mixer-settlers. In the mixers, the minor phase is dispersed to the major phase, and the copper ion transfer takes place on...
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- Spring '08