| http://www.w3.org/ns/prov#value | - The process of removing asphaltene and impurities such as nickel and vanadium with a solvent is a method of merely separating asphaltene, and thus asphaltene in the raw oil is separated as it is, and therefore, as the raw oil becomes heavy, the amount of asphaltene after separation is increased to make use thereof problematic.
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