Question:
Oil is extracted from mustard seeds having 20 wt% oil and 80 wt% solids, using hexane as a solvent. After extraction, the hexane-free residual cake contains 1 wt% oil. Assuming negligible dissolution of cake in hexane, the percentage oil recovery in hexane is __________ % (rounded off to the nearest integer).
Oil is extracted from mustard seeds having 20 wt% oil and 80 wt% solids, using hexane as a solvent. After extraction, the hexane-free residual cake contains 1 wt% oil. Assuming negligible dissolution of cake in hexane, the percentage oil recovery in hexane is __________ % (rounded off to the nearest integer).
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Calculating oil recovery efficiency is critical in evaluating the performance of the extraction process and optimizing solvent use.
Updated On: Jan 30, 2026
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Correct Answer: 95
Solution and Explanation
Step 1: Calculate Initial and Remaining Oil Content.
Initial oil content = 20% of 100 kg = 20 kg.
Oil remaining in cake = 1% of 100 kg = 1 kg. Step 2: Calculate the Oil Extracted and Percentage Recovery. Oil extracted = Initial oil - Remaining oil = 20 kg - 1 kg = 19 kg.
Percentage recovery = \(\left(\frac{19 { kg}}{20 { kg}}\right) \times 100% = 95%\).
Oil remaining in cake = 1% of 100 kg = 1 kg. Step 2: Calculate the Oil Extracted and Percentage Recovery. Oil extracted = Initial oil - Remaining oil = 20 kg - 1 kg = 19 kg.
Percentage recovery = \(\left(\frac{19 { kg}}{20 { kg}}\right) \times 100% = 95%\).
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