... quality molecular sieve 1)10 years professional manufacturer for 3A, 4A,5A, 13X 2)drying,absorbent,cleaning ect. producthigh quality molecular sieveProduct ... this case.Methods for regeneration of molecular sieves include pressure change (as in oxygen concentrators), heating and purging with a ... purification of air, natural gas and oil, in oxygen making and hydrogen making by PAS processes5A-DW0.45-0 ...