| http://www.w3.org/ns/prov#value | - A heavy hydrocarbon feedstock within the meaning of the present invention is a feedstock having a density at 15??? C. greater than about 930 kg/m3 and composed essentially of hydrocarbons but containing also other chemical compounds which have, in addition to carbon and hydrogen atoms, heteroatoms such as oxygen, nitrogen and sulfur, and metals such as vanadium or nickel.
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