Dehydration of compressed air on brake systems of heavy- and medium-duty trucks, buses and trains Shanghai ... : ·drying and removing of CO2 from natural gas,LPG,air,inert and athmospheric gases,etc.·removal of hydrocarbons,ammonia and methanol ... (ammonisa syn gas treating)·in the air break uints of buses ,trucks and locomotives.·dehydration of electronic element,pharmaceutical,food,etc. Packing ...