CALCIUM CHLORIDE ROUTE WORKING PRINCIPLE:
Hydrochloric acid and water form a maximum boiling point azeotrope at 11O°C corresponding to a concentration of 20.24%; (w/w) HCl. By adding concentrated CaCl solution to commercial hydrochloric acid the azeotrope 2 point is eliminated and. the entire' HCl becomes available for liberation by distillation. Anhydrous HCl gas generation through Calcium Chloride Route is the most environmental friendly technique.
PROCESS DESCRIPTION:
The above principle- is achieved in practice by feeding metered quantities of commercial HCl and 50% CaCl -solution to a stripping column with a steam 2 heated re-boiler at bottom. The effluent from bottom of the column is a dilute acidic calcium chloride solution which is concentrated to 50% in a evaporator and re-used. The vapor leaving is condensed stage wise with cooling water and chilled brine as coolant. The relatively dry gas passes through a mist eliminator and then through a rotameter to the point of consumption.
RAW MATERIAL UTILITY REQUIREMENTS:
The indicative requirements for 20 Kg/hr HCl gas generator are given below.
1 |
30-32 % HCl, (Kg/hr) |
: 66 |
2 |
Cooling water at 30 °C (M /hr)) |
: 4 |
3 |
Chilled brine at -10 °C (M /hr) |
: 3 |
4 |
Steam at 6 Kg/cm (g) |
: 150 |