... SiO2 . n H2O Application : 1) Drying and removing of CO2 from natural gas, LPG, air, inert and athmospheric gases, etc 2 ... ) Removal of hydrocarbons, ammonia and methanol from gas streams (ammonia syn gas treating) 3) Special types are ... in the case of pressure swing processes. To remove moisture from a 4A molecular sieve, a temperature of 250-280°C ...