| http://www.w3.org/ns/prov#value | - In the literature, there is described a process including feeding a liquefied natural gas into the middle portion of a fractionation column; heating the contents of the lower portion of the fractionation column to produce methane-enriched vapors in the upper portion of the fractionation column; withdrawing vapors from the upper portion of the fractionation column and directly passing the vapors in
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