On cooling after filtration, the cristal of Benzenesulfonic acid’s berium salt is obtained, separating these crystals and adding appropriate amounts of sulphuric acid. Berium sulfate precipitates and Benzenesulfonic acid is released.
The precipitates of berium sulfate are filtered and separated. Water containing crystals of Benzenesulfonic acid are obtained after cooling the filtrate. Anhydrous Benzenesulphonic(C6H5SO3H.3/2H2O) Acid is obtained after being isolated and heated.