Loading...Hard water makes the wet processing job extremely difficult, producing soap curd and detergent deposits on fabric, leaving soap scum rings in the bathtub and streaks on glassware, and clogging hot water pipes. Here is some example of creating problems with hard water.
1.Scale formation in boiler: Temporary hardness is rapidly converted to Calcium Carbonate and magnesium hydroxide in a boiler and in time accumulates in the form of scale on the inner surface of the shell or in the tubes.
Ca(HCO3)2 = CaCO3+CO2+H2O
Mg(HCO3)2 = MgCO3+CO2+H2O
MgCO3+H2O = Mg(OH)2+CO2
Hence [CaCO3+Mg(OH)2]
2.Reaction with soap : The salts of Calcium and Magnasium (Permanent Hard Water) does not easily form lather with soap to form insoluble organic salts and becomes wastage of soap.
2RCOONa+MgSO4——-à (RCOO)2Mg+NaSO4
2RCOONa+CaSO4——-à (RCOO)2Ca+NaSO4
3.Reaction with dyestuff : Ass dyestuff reaction hard water some dyestuffs are precipitated. So dyestuffs are spoiled. Hence shade which harm the quality of fabric.
4.Corrosion of boiler : Corrosion can be a serious causes of wear in boilers if suitable water are not used. Dissolved oxygen in the presence of CO2 is a common cause of corrosion especially affecting high pressure boilers. The CO2 reacts with the iron, forming ferrous carbonate which in turn tends to hydrolyze to ferrous hydroxide.
Fe+H2O+CO2 == FeCO3+H2
FeCO3+H2O == Fe(OH)2+CO2
5.Deposition on the goods during scouring : Soap react with hard water and produce insoluble salts which deposit with the fabric during scouring. Insoluble salts do hard and unflexible the fabric which create problem in the next process.
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