A Caustic Recovery Plant is typically a multiple effect evaporation plant which will re-concentrate the weak lye by heating it in the heat exchanger and when it reaches evaporator, the vapor is released due to water evaporation that increases its concentration. This process repeats itself by circulation in caustic recovery plant till the desired concentration is reached. Textile Mills involved in mercerizing of (Yarn, Woven, Knitted, Denim) cotton use caustic (Na OH) in mercerizing machines. After the process in a mercerizing machine, these dilute caustic soda solutions come out from mercerizing machines as a drain end crystal breakage in discharged.
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