Oxygen concentrating self-rescuer device

A device for converting post-explosion gases of a perilously low-oxygen level in the ambient environment to a breathable mixture for human respiration, the device comprising:

• an intake pump that draws in gas from outside the device to create a gas stream;
• a first sieve comprising an input, a separated output, and a residual output, wherein:
• the gas stream created by the intake pump enters the first sieve through the input;
• the first sieve separates the gas stream into:
• a mixture including oxygen, carbon dioxide, and carbon monoxide;
• and
• a residual stream including nitrogen and methane;
• and
• the mixture flows to the separated output of the first sieve and the residual stream flows to the residual output of the first sieve;
• a second sieve comprising an input, a separated output and a residual output, wherein:
• the input of the second sieve is coupled to the residual output of the first sieve such that the residual stream flows from the first sieve to the second sieve;
• the second sieve separates nitrogen from the residual stream including nitrogen and methane, which is output through the separated output of the second sieve;
• and
• a remaining portion of the residual stream including methane, which is stripped of nitrogen, vents to outside of the device through the residual output of the second sieve;
• a gas processor that couples to the separated output of the first sieve, which separates the oxygen from the mixture of oxygen, carbon dioxide, and carbon monoxide;
• a primary oxygen storage canister that stores oxygen separated from the mixture until an oxygen-concentration threshold is met;
• a nitrogen storage canister coupled to the separated output of the second sieve that stores the separated nitrogen;
• and
• a breathing mask that receives a breathable air comprised of stored oxygen and nitrogen;
• wherein the oxygen and nitrogen are metered to a user through the breathing mask at a habitable level of 19-21% oxygen.