carbon molecular sieve(CMS) is a kind of adsorbent. CMS takes the apperance of cylindrical black soild,contain countless 4 angstrom fine pores, it can be used to seperate air into nitrogen and oxygen. Carbon Molecular Sieve is the most important nd every PSA Nitrogen System and utilized in the production of Nitrogen. Carbon molecualr sieves is widely applied in petroleum chemical industry, the heat treatment of metal, the electronic manufacture and food preservation industries.