| http://www.w3.org/ns/prov#value | - In a combination process wherein crude shale oil is contacted by the process of claim 13 with an immiscible aqueous phase containing CO2 to remove nitrogen, and other contaminants including sulfur and metals, such as arsenic, nickel and vanadium, wherein the CO2 -containing gas is thereby separated into purified streams enriched in N2 and CO2, the improvement which comprises using a CO2 -containin
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