Process for separating nitrogen from less polar compounds
First Claim
1. A process for separating nitrogen from a gas mixture containing nitrogen and at least one gas which is less polar than nitrogen, and employing a technique of differential adsorption of the gases, called PSA process, using an adsorbent of zeolite type, according to which the PSA process is used at a temperature greater than 50°
- C. by employing as adsorbent a zeolite whose nitrogen adsorption isotherm at 20°
C. exhibits a curvature characterized by a parameter C defined by the formula;
where q(P1) denotes the quantity of nitrogen adsorbed at pressure P1 andq(P2) that adsorbed at pressure P2, and the pressures P1 and P2 are defined respectively from the high and low pressures of the PSA cycle in question, C being at least equal to 2.9.
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Abstract
Process for separating nitrogen from a gas mixture containing nitrogen and at least one gas which is less polar than nitrogen, and employing a differential gas adsorption technique, called PSA process, using an adsorbent of zeolite type, according to which the PSA process is used at a temperature of at least 40° C. by employing as adsorbent a zeolite whose nitrogen adsorption isotherm at 20° C. exhibits a curvature characterized by a parameter C defined by the formula:
where q(P1) denotes the quantity of nitrogen adsorbed at pressure P1 and
q(P2) that adsorbed at pressure P2, and
the pressures P1 and P2 are defined respectively from the high and low pressures of the PSA cycle in question,
C being equal to at least 2.5.
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Citations
4 Claims
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1. A process for separating nitrogen from a gas mixture containing nitrogen and at least one gas which is less polar than nitrogen, and employing a technique of differential adsorption of the gases, called PSA process, using an adsorbent of zeolite type, according to which the PSA process is used at a temperature greater than 50°
- C. by employing as adsorbent a zeolite whose nitrogen adsorption isotherm at 20°
C. exhibits a curvature characterized by a parameter C defined by the formula;
where q(P1) denotes the quantity of nitrogen adsorbed at pressure P1 and q(P2) that adsorbed at pressure P2, and the pressures P1 and P2 are defined respectively from the high and low pressures of the PSA cycle in question, C being at least equal to 2.9. - View Dependent Claims (2, 3, 4)
- C. by employing as adsorbent a zeolite whose nitrogen adsorption isotherm at 20°
Specification
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- Resources
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Current AssigneeL'Air Liquide Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude (L'Air Liquide SA)
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Original AssigneeL'Air Liquide Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude (L'Air Liquide SA)
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InventorsMoreau, Serge, Sardan, Bernard
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Primary Examiner(s)Spitzer, Robert H.
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Application NumberUS08/718,696Time in Patent Office1,929 DaysField of Search95/96--03, 951/06, 951/30US Class Current95/96CPC Class CodesB01D 2253/108 ZeolitesB01D 2253/30 Physical properties of adso...B01D 2256/10 NitrogenB01D 2256/12 OxygenB01D 2256/16 HydrogenB01D 2257/102 NitrogenB01D 53/047 Pressure swing adsorption
