Recovery of chlorine from dilute hydrochloric acid by electrolysis using a chlorine resistant anion exchange membrane

摘要: A new chlorine resistant anion exchange membrane enables innovative possibilities for hydrochloric acid electrolysis recovery of chlorine. This is interest that neutralized in the chemical industry because purity and concentration are not sufficiently high recycling. In common process fed into anode compartment needs a satisfactory HCl supplying with chloride ions. Using an as cell separator feed flows cathode chamber where low acceptable Cl− ions at can be supplied by addition salt which consumed. Experimental data presented: permselectivity improved up to above 97% using CaCl2 added salt, current efficiency 98% oxygen content 0.5 vol%, voltage 4 kA m−2 2.3 V, equivalent 1740 kWh per t produced chlorine, even concentrations. Thus, power consumption comparable process. problem water transport through membrane. Therefore, experiments two alternatives were carried out. Disadvantages avoided concentrated solution anolyte catholyte absorption medium diluted gas streams. Additionally, design was investigated directly connected empty (gas filled) compartment.