Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70% ?
Correct answer: A. Nickel
- A. Nickel
- B. Steel
- C. Cast iron
- D. Karbate
Explanation
Nickel has excellent resistance to concentrated caustic soda, including hot NaOH solutions, so it is suitable for the evaporator and tubes. Ordinary steel is more vulnerable to caustic corrosion under severe concentrating conditions.
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