| 摘要 |
<p>PURPOSE:To recover the oxygen adsorbed in an adsorption column and to improve the recovery rate for gaseous oxygen in a method for producing oxygen by a pressure swing adsorption method by washing the adsorption column, upon ending of an adsorption stage, with gaseous nitrogen. CONSTITUTION:An adsorption column is changed over by a selector valve to stages for pressure adsorption, vacuum regeneration and repressurization so that the gaseous nitrogen in raw material air is adsorbed and gaseous oxygen is continuously produced. The adsorption column upon ending of the pressure adsorption stage of a method for producing oxygen by a pressure swing adsorption method is washed with gaseous nitrogen, and slightly concd. gaseous oxygen is obtd. The gas contg. the concd. oxygen is reutilized as a gaseous raw material. The recovery rate for the gaseous oxygen of the product is thus improved.</p> |
