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How is demineralized water, boiler water, and soft water distinguished from each other, and which ones are used in methanol synthesis and distillation?
Deionized water! It is water in which the strong electrolytes that are easy to remove have been removed or reduced to a certain extent. The residual salt content in the desalinated water should be between 1 and 5 milligrams per liter. Boiler water! Mainly control suspended solids: mg/L ≤20. Total hardness: mmol/l ≤4. Total alkalinity: mmol/l; pH (25°C): 8–12, ≥7. Dissolved solids: mg/L <5000. Soft water! Water that contains no or only a small amount of calcium and magnesium ions is called soft water. The precipitation of calcium and magnesium salts causes scale, which hinders heat conduction; in severe cases, it can even lead to boiler explosions. Our factory generally uses desalinated water; both distillation and synthesis processes make use of it, while the condensate is used for feeding water into the steam drum!