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What happens to the heavy oil fractions produced in Fischer-Tropsch process?

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What happens to the heavy oil fractions produced in Fischer-Tropsch process?

(a) They are separated out

(b) They are mixed with gasoline

(c) They are subjected to cracking

(d) No heavy oil fractions are produced

The question was asked in an interview for job.

Asked question is from Synthetic Gasoline from Non-Petroleum Sources in section Fuels and Combustion of Engineering Chemistry II

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Correct answer is (c) They are subjected to cracking

The best I can explain: The gasoline fraction produced in Fischer-Tropsch process is collected for further processing, while the heavy oil fractions are subjected to cracking to produce more gasoline. This avoids the wastage of the total product obtained.

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