This can be achieved by various methods , with NUMBER@1 -RRB- solution cooling , NUMBER@2 -RRB- addition of a second solvent to reduce the solubility of the solute -LRB- technique known as antisolvent or drown-out -RRB- , NUMBER@3 -RRB- chemical reaction and NUMBER@4 -RRB- change in pH being the most common methods used in industrial practice .

This can be achieved by various methods -- solvent evaporation , cooling , chemical reaction , ` drowning ' being the most common ones used in industrial practice .
