Standard 5A molecular sieve can be used to remove water, carbon dioxide, and hydrocarbons from feed gas and is commonly used in air prepurification units. This molecular sieve can be used in PSA separation for paraffin and isoparaffin mixtures (n~C4~n~C6), and to purify air, oxygen, nitrogen, hydrogen, and synthesis gases from mixed gas streams. Standard 5A also has applications as a dehydrator in industries such as liquid petroleum gas, ammonia cracked gas, and other industrial inert gas purification applications.