At what temperature does the H2S and olefin gases are evolved in the process of carbonisation?

At what temperature does the H2S and olefin gases are evolved in the process of carbonisation? Correct Answer 270oC

In the process of carbonisation, the bituminous coal is slowly heated to remove moisture and occluded gases. Then at 270oC H2S and olefin gases are evolved. At about 450oC the liberated gases consist of hydrocarbons and at 700oC hydrogen gas is liberated.
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