Abstract
Conversion of cystine to cysteine was carried out in a batch recirculation type electrochemical membrane reactor. The reactor was constructed with a lead plate as cathode, and platinum as anode. The catholyte was cystine in HCL solution, and the anolyte was 0·1 n H 2SO 4 solution. The catholyte and anolyte were separated by a cation exchange membrane. When the electrode distance was 0·65 cm, catholyte concentration was 0·4 m cystine, the process was operated at 30°C, 200 ml/min of flow rate and 20 mA/cm 2 of current density, a current efficiency of 91·5% could be achieved. After electrochemical reaction was completed, the cysteine crystal was obtained by further concentration and crystallization. The overall recovery of cysteine crystal reached 91%.
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