Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching ?
Correct answer: B. Butyl alcohol
- A. Isopropyl alcohol
- B. Butyl alcohol
- C. Toluene
- D. Hexane
Explanation
n-Butyl alcohol selectively extracts phosphoric acid from the hydrochloric-acid leach liquor, while calcium chloride remains mainly in the aqueous phase. This separation is a liquid-liquid solvent-extraction step.
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