Calcium hypochlorite (bleaching powder) is produced by reacting calcium hydroxide with chlorine gas at 50 degrees C. The reaction produces calcium hypochlorite and water. Given that 100 tons per hour of calcium hypochlorite is required, the amount of chlorine gas needed is calculated to be 78 tons per hour based on the reaction stoichiometry and molecular weights. Using the ideal gas law, the volume of chlorine gas needed is calculated to be approximately 24.6 million liters per hour.

1. Bleaching Bowder

2. Ca(oH)2
CL2
50 C
Reaction o bleaching bowder
o
Ca(oH )2 + cl2 ca + H20
cl

5. Flow sheet :-

6. Example
Ca(OH)2 + CL2 → CaOCl + H2O
74 71 91 18
• M .w ?? 100
• Amount of cl2 = (100 X 71)/91 = 78 ton/hr
• Mass of cl2 required to produce 100 ton of
Caocl =78 x106 g/hr

7. Assume:-
T=273 k
P =1.013x10^5
• P v =n R T
• P v =M/M.W* R* T
• 1 X V= (78 X106 /71)X 0.08206 X 273
• Volume of cl2
V=24.593 X 106 L/hr