Discussion
Match each stream in List I with where it arises in List II.
List I
A. Miscella
B. Soapstock
C. Spent earth
D. Cake
List II
1. Alkali neutralisation
2. Solvent extraction
3. Mechanical pressing
4. Bleaching
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each stream identifies its own process. Miscella is oil dissolved in solvent, so it can only come from solvent extraction. Soapstock contains soaps, so it can only come from alkali neutralisation.
Spent earth is used adsorbent, so it comes from bleaching. Cake is the pressed solid, so it comes from mechanical pressing. The composition of each stream names its origin without any need for memorisation - a useful check whenever a question lists refinery by-products.
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