Chlor-Alkali Membrane Cell

This simulation renders a real 3D chlor-alkali membrane cell — the industrial process behind essentially all of the world's chlorine and caustic soda (NaOH). A cation-exchange membrane separates a brine anolyte from a dilute-NaOH catholyte; at the titanium anode chloride ions oxidize to chlorine gas, at the nickel cathode water reduces to hydrogen and hydroxide, and sodium ions physically migrate across the membrane to close the circuit and build up caustic. Drag the current density to speed up electrolysis and gas evolution, lower the membrane's Na⁺ selectivity to watch chloride leakage cut into current efficiency and slow caustic buildup, and adjust the brine feed concentration — all governed by Faraday's law and a charge-balance transport model, with live cell voltage, current efficiency, NaOH concentration and gas-evolution readouts.