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3A molecular sieve is an alkali metal aluminosilicate that adsorbs molecules with a critical diameter greater than 3A. During water adsorption, 3A molecular sieve can exclude other hydrocarbon molecules. It is widely used in the deep drying of petroleum cracked gases such as ethylene, propylene, butadiene, acetylene, and natural gas. It can also be used to dry polar substances (such as ethanol), liquefied petroleum gas, and solvents. After adsorption by 3A molecular sieve, the water content of the gas can be reduced to less than 1 ppm (dew point less than -70°).
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