The techniques have been developed on removal of copper ion in the absorption refrigerator. Results are summarized as follows ;
(1) Concentrations and chemical forms on copper ion and oxides in refrigerant and LiBr solutions in operating refrigerators were analyzed to be base data for removal techniques.
(2) Examining removal technique by electrochemical reducing process, it was clarified that copper ion was effectively reduced to metallic state at the cathode potentials between −1.0∼−0.6 V vs. SSE.
(3) Trial device has been made for removal of copper ion by 2 electrodes system. In the field test, it was clarified that copper ions in both refrigerant and LiBr solution were well collected on the cathode electrode to the concentration levels below the target value of 1 mg dm
−3.
(4) A filter device combined with active metal electrodes has been developed for removal of copper ions. Applying the developed unit to laboratory and field tests, it was verified that copper ions in both refrigerant and LiBr solution were well captured to the concentration levels below the target value.
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