Liquid nitrogen prodn. process - feeds liquid oxygen into base of low pressure column for air decomposition

摘要

The process produces liquid nitrogen using the refrigerating action resulting from evaporation of liquid oxygen. The liquid oxygen is fed externally into the base of a low pressure column of a two-column unit, for air decomposition, where it evaporates in a main condenser under the action of the condensing nitrogen in a medium-pressure column. The nitrogen is collected below the main condenser, and drawn off as the product. The gaseous nitrogen can be drawn off from the head of the medium-pressure column, expanded to produce output, and brought into heat-exchange contact with the air to be decomposed.