Question:
Which of the following is NOT a step in Pre‐press Solvent Extraction?
Which of the following is NOT a step in Pre‐press Solvent Extraction?
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The standard sequence for oil extraction is: Cleaning $\rightarrow$ Drying $\rightarrow$ Dehulling $\rightarrow$ Flaking $\rightarrow$ Cooking $\rightarrow$ Pre-pressing $\rightarrow$ Solvent Extraction $\rightarrow$ Desolventizing.
Updated On: Aug 7, 2026
- Seed Cooking
- Pressing the flake
- Solvent Extraction
- Seed Whipping
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the operation that is not part of the standard industrial process for extracting oil from oilseeds using a combination of mechanical pressing and solvent recovery.
Step 2: Detailed Explanation:
• Seed Cooking (A): This is a crucial pre-treatment step. Cooking ruptures the oil cells, reduces the viscosity of the oil, and coagulates proteins, making the oil easier to express during pressing.
• Pressing the flake (B): In "pre-press" solvent extraction, the seeds are first flaked (to increase surface area) and then partially pressed (expelled). This removes about 50-70% of the oil mechanically, leaving a "cake" that is porous and ideal for the next step.
• Solvent Extraction (C): The partially de-oiled cake is treated with a solvent (usually hexane). The solvent penetrates the porous cake and dissolves the remaining oil. The resulting mixture is called miscella.
• Seed Whipping (D): This is not a processing term in the oil industry. Whipping is a process used in the dairy and confectionery industry (like for cream, egg whites, or marshmallows) to incorporate air and create foam. It has no application in the extraction of oil from hard seeds.
Step 3: Final Answer:
Seed Whipping is not a step in oil extraction.
The question asks to identify the operation that is not part of the standard industrial process for extracting oil from oilseeds using a combination of mechanical pressing and solvent recovery.
Step 2: Detailed Explanation:
• Seed Cooking (A): This is a crucial pre-treatment step. Cooking ruptures the oil cells, reduces the viscosity of the oil, and coagulates proteins, making the oil easier to express during pressing.
• Pressing the flake (B): In "pre-press" solvent extraction, the seeds are first flaked (to increase surface area) and then partially pressed (expelled). This removes about 50-70% of the oil mechanically, leaving a "cake" that is porous and ideal for the next step.
• Solvent Extraction (C): The partially de-oiled cake is treated with a solvent (usually hexane). The solvent penetrates the porous cake and dissolves the remaining oil. The resulting mixture is called miscella.
• Seed Whipping (D): This is not a processing term in the oil industry. Whipping is a process used in the dairy and confectionery industry (like for cream, egg whites, or marshmallows) to incorporate air and create foam. It has no application in the extraction of oil from hard seeds.
Step 3: Final Answer:
Seed Whipping is not a step in oil extraction.
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