Oxygen purification

Oxygen is mainly made of liquid air, which contains trace amounts of water, nitrogen, carbon dioxide and some inert gases. The purification of oxygen includes cryogenic rectification, catalytic reaction and adsorption. Generally, calcium chloride, 105 catalyst, molecular sieve injected into liquid nitrogen cold trap and off-duty filter ball are used to remove impurities and purify low-purity oxygen into high-purity oxygen.