3. Diaphragm process

The schematic diagram is shown in Figure 14 .

After passing through the anolyte, where chlorine is released, the brine percolates through a diaphragm due to the difference in level between the two compartments before undergoing the cathodic reaction. An aqueous solution containing a mixture of soda (approximately 130-150 g/L) and unprocessed salt (between 150 and 170 g/L) called cathodic liquor leaves the cell. Further processing yields commercial-grade soda.