Chemical Process
Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

Is prone to thermal decomposition
All of these
Has high water solubility and is unstable
Is soluble in ammonium chloride and potassium chloride solution

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Chemical Process
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to

Adjust the pH of the syrup
Remove the coloring matter from the syrup
Reduce the viscosity of the syrup
Improve the rate of crystallisation of sugar

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