Removal of water and carbon dioxide from atmospheric air
First Claim
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1. The method of removing moisture and carbon dioxide from atmospheric air which comprises the steps of:
- (a) passing the air at an inlet temperature in the range of about 70°
-120°
F. and at an inlet pressure in the range of about 50 to 150 psia through a first bed of adsorbent selective in removal of water from an air stream and then through a second bed of adsorbent effective in selective removal of carbon dioxide;
then regenerating said first and second adsorbent beds by(b) reducing the pressure in said beds by gas withdrawal therefrom in a direction opposite that of step (a) to about atmospheric pressure level;
(c) and at the attained pressure level of step (b) purging both said beds with a gas stream freed of water and carbon dioxide, said gas stream being introduced into and passed through said second bed into and through said first bed;
followed by(d) repressuring both said beds to a level in the range of 50-150 psia with product gas freed of water and carbon dioxide, passed into said beds in the same flow direction as step (c).
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Abstract
Reduction in energy consumption is had in a system for adsorptive removal of moisture and CO2 from atmospheric air by passing the feed air through consecutive beds of adsorbent comprising first alumina then molecular sieve zeolite, at near ambient temperature during adsorption of these impurities and subsequent regeneration of the sorbent laden beds by pressure reduction to about atmospheric level and purge at that level with product gas freed of water and CO2.
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Citations
7 Claims
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1. The method of removing moisture and carbon dioxide from atmospheric air which comprises the steps of:
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(a) passing the air at an inlet temperature in the range of about 70°
-120°
F. and at an inlet pressure in the range of about 50 to 150 psia through a first bed of adsorbent selective in removal of water from an air stream and then through a second bed of adsorbent effective in selective removal of carbon dioxide;
then regenerating said first and second adsorbent beds by(b) reducing the pressure in said beds by gas withdrawal therefrom in a direction opposite that of step (a) to about atmospheric pressure level; (c) and at the attained pressure level of step (b) purging both said beds with a gas stream freed of water and carbon dioxide, said gas stream being introduced into and passed through said second bed into and through said first bed;
followed by(d) repressuring both said beds to a level in the range of 50-150 psia with product gas freed of water and carbon dioxide, passed into said beds in the same flow direction as step (c). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification