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Which type of carbonisation method is used for obtaining particular types of by-products?

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Which type of carbonisation method is used for obtaining particular types of by-products?

(a) High temperature carbonisation

(b) Medium temperature carbonisation

(c) Low temperature carbonisation

(d) No by-products are formed

This question was addressed to me during an online exam.

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

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The correct answer is (b) Medium temperature carbonisation

To explain I would say: The temperature in this type of carbonisation varies from 700-900 ^oC. The yields of NH3, tar, light oils are obtained from this carbonisation. The yields of tar obtained from this process are different from the yields obtained by high temperature carbonisation.

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