A procedure and installation of frigorifical depuration of a gas (Machine-translation by Google Translate, not legally binding)

摘要

Process of refrigeration purification of a gas, intended to be treated at low temperature, especially in a gas separation plant by liquefaction and rectification, with periodic inversion of the gaseous streams, in which the gas to be treated enters a compartment under pressure of the temperature exchanger in which it is cooled and deposits its liquefied impurities, while a part of at least the treated gas, called "sweep gas", passes at a smaller pressure to another exchanger compartment in which it overheats and vaporizes and entrains the impurities deposited in the preceding period, characterized in that the gas to be treated passes successively to the two compartments of a first main exchanger, in countercurrent to itself and cooling it between its two passages by an external contribution of cold, and because it is then passed to one of the compartments of a second main exchanger, id the first, countercurrent to the sweeping gas, said cooling contribution and the characteristics of the exchangers being such that the temperature of the gas to be treated, at the outlet of the cold end of the first exchanger, is lower than that of the sweeping gas at the entrance of the cold end of the second exchanger, the roles of the first main exchanger and the second main exchanger being periodically inverted. (Machine-translation by Google Translate, not legally binding)