Oxygen production process by pressure swing adsorption separation

A process for producing oxygen by means of a pressure swing adsorption separation in a plurality of columns packed with zeolite as adsorbent, an adsorption step carried out at a relatively high pressure and a regeneration step carried out at or below atmospheric pressure are repeated alternately and sequentially, whereby oxygen and nitrogen are separated from a gas mixture principally containing oxygen and nitrogen, and oxygen gas is produced, the process comprising the steps of:

• conducting pressure recovery in which communication is provided between an outlet end of a column which has completed said adsorption step and an outlet end of a column which has completed said regeneration step, and in which gas remaining in the column which has completed said adsorption step is collected in the column which has completed said regeneration step;
• and
• simultaneously with said pressure recovery, introducing said gas mixture into at least one of the column which has completed said adsorption step and the column which has completed said regeneration step through the inlet end thereof.

A process for producing oxygen by means of a pressure swing adsorption separation in a plurality of columns packed with zeolite as adsorbent, an adsorption step carried out at a relatively high pressure and a regeneration step carried out at or below atmospheric pressure are repeated alternately and sequentially, whereby oxygen and nitrogen are separated from a gas mixture principally containing oxygen and nitrogen, and oxygen gas is produced, the process comprising the steps of:

• conducting pressure recovery in which communication is provided between an outlet end of a column which has completed said adsorption step and an outlet end of a column which has completed said regeneration step, and in which gas remaining in the column which has completed said adsorption step is collected in the column which has completed said regeneration step;
• and
• simultaneously with said pressure recovery, introducing said gas mixture into the column which has completed said regeneration step through the inlet end thereof, while the inlet end of the column which has completed said adsorption step is closed.

A process for producing oxygen by means of a pressure swing adsorption separation in a plurality of columns packed with zeolite as adsorbent, an adsorption step carried out at a relatively high pressure and a regeneration step carried out at or below atmospheric pressure are repeated alternately and sequentially, whereby oxygen and nitrogen are separated from a gas mixture principally containing oxygen and nitrogen, and oxygen gas is produced, the process comprising the steps of:

• conducting pressure recovery in which communication is provided between an outlet end of a column which has completed said adsorption step and an outlet end of a column which has completed said regeneration step, and in which gas remaining in the column which has completed said adsorption step is collected in the column which has completed said regeneration step;
• and
• simultaneously with said pressure recovery, introducing said gas mixture into the column which has completed said adsorption step through the inlet end thereof, while the inlet end of the column which has completed said regeneration step is closed.

A process for producing oxygen by means of a pressure swing adsorption separation in a plurality of columns packed with zeolite as adsorbent, an adsorption step carried out at a relatively high pressure and a regeneration step carried out at or below atmospheric pressure are repeated alternately and sequentially, whereby oxygen and nitrogen are separated from a gas mixture principally containing oxygen and nitrogen, and oxygen gas is produced, the process comprising the steps of:

• conducting pressure recovery in which communication is provided between an outlet end of a column which has completed said adsorption step and an outlet end of a column which has completed said regeneration step, and in which gas remaining in the column which has completed said adsorption step is collected in the column which has completed said regeneration step;
• and
• simultaneously with said pressure recovery, introducing said gas mixture into both the column which has completed said adsorption step and the column which has completed said regeneration step through inlet ends of both columns respectively.