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How much yield of coke is produced in low temperature carbonisation?

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in Engineering Chemistry II by (789k points)
How much yield of coke is produced in low temperature carbonisation?

(a) 75-80 %

(b) 60-70 %

(c) 100 %

(d) 85-90%

The question was asked during an online interview.

My question is from Secondary Solid Fuels in section Fuels and Combustion of Engineering Chemistry II

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The correct answer is (a) 75-80 %

The explanation: The coke produced by this method is used as a domestic fuel. The coke formed contains 5 to 15 % of volatile matter and is not sufficiently strong for metallurgical processes.

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