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In production of high concentration oxygen by a pressure-swing-adsorption method using air as a raw material, air is introduced into a first step adsorption apparatus packed with a zeolite molecular sieve and is subjected to a pressure-swing-adsorption operation to obtain a non-adsorbed gas comprisi

In production of high concentration oxygen by a pressure-swing-adsorption method using air as a raw material, air is introduced into a first step adsorption apparatus packed with a zeolite molecular sieve and is subjected to a pressure-swing-adsorption operation to obtain a non-adsorbed gas comprising oxygen as the major component, argon and nitrogen; the non-adsorbed gas is introduced into a second step adsorption apparatus packed with a carbon molecular sieve and is subjected to a pressure-swing-adsorption operation to separate argon and nitrogen from oxygen as a non-adsorbed gas; and the desorbed oxygen is obtained as high concentration oxygen.

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A process for producing high concentrations of oxygen by a pressure-swing-adsorption method using air as a raw material; characterized by introducing air into a first step adsorption apparatus packed with a zeolite molecular sieve; subjecting the air to a pressure-swing-adsorption therein to obtain

A process for producing high concentrations of oxygen by a pressure-swing-adsorption method using air as a raw material; characterized by introducing air into a first step adsorption apparatus packed with a zeolite molecular sieve; subjecting the air to a pressure-swing-adsorption therein to obtain a non-adsorbed gas containing oxygen as the major component, nitrogen and argon; introducing the non-adsorbed gas into a second step adsorption apparatus comprising three columns packed with a carbon molecular sieve; subjecting the gas to a pressure-swing-adsorption operation therein to conduct a desorption of the adsorbed oxygen and obtain a desorbed gas as high concentration oxygen having high concentration of 99% or above, and to separate a non-adsorbed gas which is an oxygen gas containing argon and nitrogen; introducing the non-adsorbed gas into a third step adsorption apparatus comprising two columns packed with a carbon molecular sieve; subjecting the gas to a pressure-swing-adsorption operation therein to conduct desorption of the adsorbed oxygen; and returning the desorbed oxygen to the raw material gas of the second step adsorption apparatus to enhance the total recovery of oxygen.