One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 445
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Multiple-choice question: Which of the following materials cannot be used for pipelines to transport alkali solutions in chlor-alkali plants? ( ) Explain the reason for a higher score. A. Seamless steel pipes B. Cast iron pipes C. Lead pipes D. Aluminum pipes. Answer: D. Aluminum pipes
B Cast iron pipes – [Due to the risk of alkali embrittlement, among all the commonly used metal pipes, cast iron pipes have the highest corrosion rate at various concentrations of sodium hydroxide and at different temperatures.]
D Aluminum pipes react with alkali solutions；
D aluminum tube: Aluminum reacts chemically with strong alkalis and is not resistant to chemical corrosion.
For the transportation of alkaline solutions in chlor-alkali plants, pipes made of which of the following materials should not be used? (D) A. Seamless steel pipes B. Cast iron pipes C. Lead pipes D. Aluminum pipes. Alkaline solutions, upon hydrolysis, produce hydroxide ions, which can react chemically with aluminum oxide; therefore, aluminum pipes cannot be used for transporting such solutions.
For the transportation of alkaline solutions in chlor-alkali plants, pipes made of which of the following materials should not be used? (D) A. Seamless steel pipes B. Cast iron pipes C. Lead pipes D. Aluminum pipes Alkaline solutions can undergo chemical reactions with aluminum, so aluminum pipes cannot be used for transporting such solutions.
D Aluminum pipes: Aluminum pipes are not resistant to alkalis and will react with them.