Method for removing hydrogen by cryogenic distillation in production of high purity nitrogen

摘要

PURPOSE: To manufacture high purity nitrogen by removing hydrogen with the aid of cryogenic distillation. ;CONSTITUTION: There is included an impurity comprising a soft product such as air, one kind or more of a heavier component (for example, oxygen and argon), and one kind or more of a softer component (for example, hydrogen and helium). A feedstock flow cooled, compressed, purified, and dried is supplied to heat exchange means 11 through a conduit 10, and is then supplied to a high pressure tower 13 through a conduit 12. A fluid rich in nitrogen is supplied to a low pressure tower 14 through a conduit 16 for supply from the high pressure tower 13, and it is fractionated at low pressure of 0.4 bar or lower. The fluid flow LIN is removed as a liquid production fraction from a bottom of the low pressure tower 14. Hereby, hydrogen contained in air is removed, and high purity nitrogen can be manufactured without the use of a catalyst.;COPYRIGHT: (C)1993,JPO