High temperature oxygen recovery with reversible chemical reaction
First Claim
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1. A continuous process for separating oxygen from air by a reversible chemical absorption at relatively high temperature and desorption at a relatively low temperature comprising the steps of:
- (a) contacting air with a liquid slurry of a chemical absorbent for oxygen having a composition of
space="preserve" listing-type="equation">M.sub.x V.sub.2 O.sub.5 wherein M=Li, Na, K, Ag, or mixture thereof and 0<
x<
1, and heating the liquid slurry to a temperature in the range of approximately 630°
C. to 870°
C. to absorb at least a portion of the oxygen from the air and oxidize the liquid slurry to a predominantly liquid M2 O/V2 O5 mixture;
(b) separating the oxygen depleted air from the oxidized liquid mixture;
(c) cooling the oxidized liquid mixture to a temperature in the range of approximately 370°
C. to 500°
C. to desorb oxygen from the liquid mixture and regenerate the liquid slurry; and
(d) separating the oxygen from the liquid slurry.
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Abstract
Separation of oxygen from air is performed in a continuous, cyclic manner using vanadium bronze liquid slurries as reversible chemical absorbents, absorbing at elevated temperature and desorbing at lowered temperature.
16 Citations
7 Claims
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1. A continuous process for separating oxygen from air by a reversible chemical absorption at relatively high temperature and desorption at a relatively low temperature comprising the steps of:
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(a) contacting air with a liquid slurry of a chemical absorbent for oxygen having a composition of
space="preserve" listing-type="equation">M.sub.x V.sub.2 O.sub.5wherein M=Li, Na, K, Ag, or mixture thereof and 0<
x<
1, and heating the liquid slurry to a temperature in the range of approximately 630°
C. to 870°
C. to absorb at least a portion of the oxygen from the air and oxidize the liquid slurry to a predominantly liquid M2 O/V2 O5 mixture;(b) separating the oxygen depleted air from the oxidized liquid mixture; (c) cooling the oxidized liquid mixture to a temperature in the range of approximately 370°
C. to 500°
C. to desorb oxygen from the liquid mixture and regenerate the liquid slurry; and(d) separating the oxygen from the liquid slurry. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification