| http://www.w3.org/ns/prov#value | - According to this manner of working a gas rich in olefines is obtained which can be subjected to further chemical treatment in a suitable manner, for example b then passing it over contact materials suc as pumice, carbonates or other salts of the alkaline earth metals, including magnesium and beryllium, phosphates, heavy metals and the like capable of causin formation of benzene.
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