Sub-Product

NaCl brine is water with a high-concentration of dissolved sodium chloride. In diverse contexts, brine may refer to the salt solutions ranging from about 3.5% (a typical concentration of seawater, on the lower end to that of solutions used for brining foods) up to about 26% (a typical saturated solution, depending on temperature)^[1].

In the context of the chlor-alkali process, purified and saturated brine containing approximately 25 wt-% sodium chloride is used as a feedstock for the electrolytic cell^[2].

The table below gives the density (kg/L) and the corresponding concentration (% weight) of sodium chloride (NaCl) in water at different temperatures in degrees centigrade (°C)^[3].

References

1. Source: Wikipedia, Brine.
2. T. Brinkmann et al. Best Available Techniques (BAT) Reference Document for the Production of Chlor-alkali. Industrial Emissions Directive 2010/75/EU. EUR 26844. Luxembourg: Publications Office of the European Union; 2014. JRC91156.
3. handymath.com, The Complete Sodium Chloride Density-Concentration Table Calculator.