FIELD: cryogenic engineering. SUBSTANCE: method consists in cooling methane fraction of scavenging gases and condensing under pressure of 1, to 1.2 MPa followed by directing it for two-stage low-temperature rectification making use of gas cooling cycle. Only 5 to 10 percent of methane fraction will be directed for cooling and rectification, the remaining part will be returned for ammonia production. EFFECT: enhanced efficiency. 2 cl, 2 dwg
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