Selection of materials for sodium hydroxide and sodium chloride solutions
Thread Content
There is currently a multi-effect evaporation project involving aqueous solutions of sodium hydroxide and sodium chloride. The operating conditions are as follows: 1. 32% sodium hydroxide, temperature of 80 degrees； 2. 36% sodium hydroxide, temperature 60 degrees ； 3. 41% sodium hydroxide, temperature 84 degrees ； 4. 48% sodium hydroxide, temperature 130 degrees. How should the materials be selected? If the relationship between concentration and temperature is adjusted, how should the material be selected? Since the prices of various materials vary, how can the relationship between concentration and temperature be adjusted (for example, by using co-current, counter-current, or cross-flow flow patterns) to minimize the total cost?
You can consult some professional manufacturers or engineering companies. You can know the answer right away.
Enameled iron is definitely not suitable; at temperatures above 60°C in alkaline solutions, corrosion is extremely severe! It’s completely unfeasible.
Apart from the one at 130 degrees, the others should be fine.