Seeking advice
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Why does an increase in boiler water alkalinity lead to vapor-liquid azeotropy?
Same question: is it because of the sodium hydroxide in the water?
The alkalinity of the boiler water is too high; the salt concentration near the surface layer of the boiler water is high as well. The viscosity of the boiler water is great, which increases the resistance to the rise of bubbles, resulting in surface fluctuations and steam carrying water.