Molten phthalic anhydride requires storage inside a/an _______________ vessel?
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Answer: A. Aluminium
Explanation
Molten phthalic anhydride is highly corrosive to many common structural metals during storage. Aluminium provides an effective passive oxide layer that resists corrosion from the molten chemical. Therefore storage tanks holding liquid phthalic anhydride are fabricated using aluminium. Phthalic anhydride is a major industrial organic chemical used to manufacture plasticizers. Molten chemical storage requires precise temperature control to prevent freezing or thermal degradation. Material compatibility testing ensures storage vessels do not contaminate reactive organic liquids.
Chemical manufacturing facilities store large volumes of molten intermediates prior to processing. Aluminium tanks prevent iron contamination which would discolor the final chemical product. Safe storage practices protect plant operators and prevent environmental pollution incidents. Nickel clad steel is expensive and unnecessary since aluminium handles molten phthalic anhydride well. Lead lined steel is unsuitable because organic chemicals can attack or degrade lead linings. Glass lined steel is brittle and impractical for large capacity molten organic chemical storage tanks.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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