| 摘要 |
Apparatus for the production of substantially pure nitrogen (or noble gas other than helium) comprises a plant for the separation of nitrogen from air by pressure swing adsorption, a catalytic reactor for removing oxygen impurity by reaction with hydrogen, and a membrane separator for separating hydrogen and water vapour from the nitrogen to form a substantially pure product nitrogen stream. A part of the permeate gas from the membrane separator is recycled to the compressor of the plant whereby it is mixed with incoming air for separation. The need for precise control of the amount of hydrogen added to the impure nitrogen entering the catalytic reactor is obviated as excess hydrogen is removed from the nitrogen in the membrane separator. |
