A prilling tower forms an essential part of the manufacturing flowchart for__________________?
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Answer: B. Urea
Explanation
A prilling tower is an essential vertical structure used in urea manufacturing plants globally. It allows molten urea droplets to solidify into spherical solid prills while falling downward. Cooling air flows countercurrent against the descending droplets to ensure rapid and uniform solidification. Prilling is a specialized granulation technique used to convert molten chemicals into free-flowing spherical beads. Urea melts at relatively low temperatures, making thermal droplet formation and cooling highly practical. Gravity-fed vertical towers provide sufficient residence time for complete phase change of the product.
Modern urea production facilities rely on tall prilling towers to generate dust-free fertilizer products. Uniform spherical prills facilitate even mechanical spreading across large agricultural fields during planting. Environmental scrubbers atop these towers capture ammonia emissions to comply with strict regulatory standards. Option A is incorrect because synthetic ammonia is produced as a pressurized gas rather than prilled. Option C is wrong because superphosphate is typically granulated using drum or pan agglomerators. Option D is incorrect because triple superphosphate is granulated through standard compaction methods.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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