Method of producing the gaseous and liquefied nitrogen and an apparatus used therefor

Abstract

Abstract In a method of producing gaseous and liquefied nitrogen having a pressure higher than atmospheric pressure, by the use of an apparatus comprising a reversible heat exchanger and a single column rectifier, the combination of following steps: the impure gas obtained by heat-exchanging, in a condenser-evaporator, of liquefied air with nitrogen gas, each of which has been separated in the column, is divided into two parts; one of these parts is again divided into two parts; one part of this second division is passed through a control valve and then through the heat exchanger, after which it is united and admixed with the remaining part of the gas resulting from the second division, which has passed through a control valve; this admixture is supplied to an expansion turbine; the expanded impure gas is united and admixed with the remaining part of the gas resulting from the original division, which has passed through a control valve: and this admixture, after having been passed through the air-liquefier and then the heat exchanger, is taken out of the apparatus. Adopting the abovementioned process makes it possible to industrially and advantageously produce gaseous nitrogen and liquefied nitrogen.

Inventors

• 👤 A Toyama
• 👤 I Matsumoto
• 👤 T Izumichi

Bibliographic Details