Gaseous mixture i.e. air, separating method for low pressure column of double air separation column, involves generating magnetic field of electromagnet to partially compensate hydrostatic pressure of liquid bath

摘要

The method involves sending boil-up gas i.e. gaseous nitrogen (GAN), to an evaporator-condenser (13) of a low pressure column (1), and evaporating liquid oxygen (LOX) by heating a liquid bath with the evaporator-condenser. A magnetic field of an electromagnet is generated to partially compensate the hydrostatic pressure of the liquid bath. A distillation is carried out in a double column comprising an average pressure column and the low pressure column thermally connected with each other by the evaporator-condenser. An independent claim is also included for a cryogenic distillation apparatus for separating a gaseous mixture by cryogenic distillation in a low pressure column.