1. sea water BLOWING OUT TOWER STEAMING OUT TOWER CONDENSER SEPARATOR DRYER

2. SO 2 (g) H 2 SO 4 (aq) Cl 2 (g) fresh water sea water HBr (aq) and H 2 SO 4 Cl 2 (g) steam Changes pH from approx 8 to 3.5 Chlorine added to displace bromine by redox reaction BLOWING OUT TOWER Cl 2 (g) + 2 Br - (aq) 2Cl - (aq) + Br 2 (g) + 2e - reduced - 2e - oxidised Sulphur dioxide gas injected Br 2 (aq) + SO 2 (g) + H 2 O (l) 2HBr (aq) + H 2 SO 4 (aq) injected to produce fine mist of acids Acid mixture contains about 13 % by mass of bromine as HBr STEAMING OUT TOWER is used to distil the bromine out of the tower Chlorine added to displace bromine by redox reaction Cl 2 (g) + 2HBr (aq) Br 2 (g) + 2HCl (aq) hot vapour mixture small xs SO 2 added to remove any Cl or Br

3. hot vapour mixture CONDENSER SEPARATOR DRYER Br 2 (g) + HCl (g) and steam damp bromine HCl (aq) concentrated H 2 SO 4 PURE BROMINE used to dry the damp bromine H 2 SO 4 (aq)