| http://www.w3.org/ns/prov#value | - hane, preferably at least 85% of methane, the other components essentially including nitrogen and c2-c4 alkanes, in which the natural gas to be liquefied is liquefied by circulating at a pressure p0 no lower than the atmospheric pressure (patm), p0 preferably being higher than the atmospheric pressure, in at least one cryogenic heat-exchanger (ec1, ec2, ec3) by a counter-current closed-circuit cir
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