Manufacturing Of Calcium Chloride

PROCESS FOR THE MANUFACTURING OF CALCIUM CHLORIDE Grades

1) anhydrous

CaCl2

2) dehydrate

CaCl2.2H2O

3) hexahydrate.

CaCl2.6H2O

1) Raw materials

a) Limestone (calcium carbonate)

(solid lumps) CaCO3

source from mining of limestone

b) Hydrochloric acid (30%) solution in water (liquid state)

HCl

Byproduct of chlorination plants By product of chloroalkali plants

c) Calcium hydroxide

(solid powder) Ca (OH)2

From manufacturer

2) Reaction 1) CO2 Molecular weight kgs 44 2 Molecular weight kgs 3 Molecular weight

CaCO 3+

100

CO 2

2HCl

-------→→

2* 36.5

+

44 Ca(OH) 2 74.09

Ca (OH)2

-----→

74.09 + 2 HCL 2* 36.5

CaCl2 + H2O +

110.99

18

CaCO3

+ H2O

100 -----→

18

CaCl2 + 2 H2O 110.99 2*18

3) Process description:a) Hydrochloric acid is charged into a acid proof brick lined tank

b) Lime stone/ calcium hydroxide is then charged slowly into the tank over a period of 5 to 6 hrs c) the whole tank content is kept for reaction for 15 to 20 hrs till all the acid is consumed d) the Ph of the reaction mass is adjusted to 7.5 to 8.0 using calcium hydroxide

e) the reacted mass is then transferred to the settling tanks f)

1

the settled reaction solution is then siphoned into a other collection tank

g) the unreacted solid from the settling tank is again recycled to the reaction tank h) the clear reacted solution in the collection tank is then filtered through filter press for i)

j)

polishing the solution the filtered calcium chloride solution is then send to the evaporation vessels where the water is evaporated and the solid calcium chloride recovered it is dryed in the dryer . the calcium chloride is then pulverized to the desired size and packed.

4) Polution abatement Unreacted solids are recycled so there is no solid waste production The reaction produces carbon dioxide which is scrubbed into lime / ammonia solution So gases are taken care of The product is non toxic

VENT air 5) Process flow chart:Ca(OH)2 Ca(OH) 2/CaCO3

HCl

CaCO 3 slurry

unreacted solid

2

recycle

water

Evapourated water

Calcium choride semifinished Calcium chloride finished

MAERIAL BALANCE FOR THE PROCESS FOR THE MANUFACTURING OF CALCIUM CHLORIDE

222tonne/ month anhydrous. 1) Raw material required Reaction stage a) Calcium carbonate or calcium hydroxide:b) Hydrochloric acid 30%

Evaporation stage:a) Input for evaporation:b) Output from evaporation:calcium chloride

:-

200 tonne / 148.18 tonne 486.66 tonne

598tonne/634tonne 222 tonne/ 222 tonne 376 tonne/ 412 tonne

water. Vapour. 2) Energy required for the process Energy is only consumed in evaporation is terms of fuel. Wood :61347.36kgs / 67221.05kgs Furnace oil:25902.22kgs/28382.22kgs Ash produced bywood will be 3067.35 kgs / month used as a fertilizer in plantation. Flue gas will contain no sulphur dioxide and carbon monoxide. 3

4