Apparatus for endothermal absorption of carbon dioxide
First Claim
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1. Apparatus for absorbing carbon dioxide from respiratory gases in a recirculatory breathing apparatus comprising:
- a. means including a recirculatory gas stream flow path extending from a breathing zone to a carbon dioxide absorption zone and back to said breathing zone;
b. means for introducing to said breathing zone carbon dioxide containing respiratory exhalations;
c. means for removing from said breathing zone respiratory exhalations;
d. means for causing said exhalations to flow in said recirculating gas stream flow; and
e. said carbon dioxide absorption zone comprising a first chamber containing lithium hydroxide and downstream immediately thereafter a second chamber containing hydrated molecular sieve containing about 40 to 60 moles, per mole of said sieve, of water, whereby said carbon dioxide is caused to react with said lithium hydroxide at least in part by the reaction;
space="preserve" listing-type="equation">LiOH + CO.sub.2 .sup.H.sbsp.2O LiHCO.sub.3
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Abstract
The absorption of CO2 from gas streams by lithium hydroxide can be caused to proceed at least partially by the reaction
LiOH + CO.sub. 2 .sup.H.sbsp.2 O LiHCO.sub.3
the reaction is endothermal, and more efficient than the normally occurring reaction. The presence of a molecular sieve and water favor the bicarbonate reaction.
27 Citations
6 Claims
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1. Apparatus for absorbing carbon dioxide from respiratory gases in a recirculatory breathing apparatus comprising:
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a. means including a recirculatory gas stream flow path extending from a breathing zone to a carbon dioxide absorption zone and back to said breathing zone; b. means for introducing to said breathing zone carbon dioxide containing respiratory exhalations; c. means for removing from said breathing zone respiratory exhalations; d. means for causing said exhalations to flow in said recirculating gas stream flow; and e. said carbon dioxide absorption zone comprising a first chamber containing lithium hydroxide and downstream immediately thereafter a second chamber containing hydrated molecular sieve containing about 40 to 60 moles, per mole of said sieve, of water, whereby said carbon dioxide is caused to react with said lithium hydroxide at least in part by the reaction;
space="preserve" listing-type="equation">LiOH + CO.sub.2 .sup.H.sbsp.2O LiHCO.sub.3 - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeFiggie International, Inc. (Johnson Controls International plc)
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Original AssigneeA-T-O Incorporated
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InventorsHeintz, Clifford E., Netteland, Loyal G.
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Primary Examiner(s)Michell, Robert W.
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Assistant Examiner(s)Recla, Henry J.
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Application NumberUS05/615,608Time in Patent Office498 DaysField of Search128/191 R, 128/202, 128/203, 128/142.6, 128/188, 128/142, 423/230, 423/641, 423/422US Class Current128/205.28CPC Class CodesA62D 9/00 Composition of chemical sub...
