Treating phosphate rock with a mixture of nitric and sulfuric acids produces_________________?
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Answer: A. Nitrophosphate
Explanation
Reacting phosphate rock with a mixed acid solution of nitric and sulfuric acids produces nitrophosphates. This dual-acid approach simultaneously dissolves the rock and provides essential nitrogen nutrients. The resulting fertilizer contains both nitrate nitrogen and available phosphate in a single granule. Mixed acid routes bypass the need for standalone phosphoric acid production in certain facilities. Nitric acid dissolves the fluorapatite matrix while sulfuric acid precipitates unwanted calcium ions. Nitrophosphate processes offer flexible nutrient ratios tailored to specific regional agricultural needs.
European fertilizer manufacturers utilize nitrophosphate technology extensively for compound crop nutrition. The process eliminates energy-intensive evaporation steps required in traditional wet phosphoric acid plants. Farmers benefit from complex granules that deliver balanced nitrogen and phosphorus simultaneously. Option B is incorrect because diammonium phosphate is manufactured by neutralizing phosphoric acid with ammonia. Option C is wrong because tricresyl phosphate is an organic plasticizer made from cresylic acid. Option D is incorrect because tributyl phosphate is produced using butyl alcohol and phosphoric acid.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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