I have a gaseous mixture (air) at a temperature of approximately 30 degrees Celsius in which the following gases are present:
- Oxygen 0 - 25%
- Carbon Dioxide 0 - 20%
- Methanol 0 - 100 ppm?
- Ethanol 0 - 100 ppm?
- Ethylene 0 - 20 ppm
I want to measure the concentration of each of the gases individually. That is not a problem with Oxygen and Carbon Dioxide but becomes a problem with methanol, ethanol and ethylene because of the cross sensitivity most sensors have for these gases.
Methanol and Ethanol are in liquid state at the temperature of 30 degrees Celsius. In the air the Ethanol and Methanol is present as vapor.
Would it be possible to design a 'scrubber' in which we bubble the air mixture through a container of for example liquid methanol to get rid of the methanol vapor and sequentially through a container of liquid ethanol to get rid of the ethanol vapor.
I can imagine that ethanol might also dissolve in the methanol liquid? And another issue would be the volatility of the ethanol and methanol liquid since we want to prevent new vapor getting into the air stream after the scrubbing.
Do you think this would be a feasible direction to investigate further? Another way to go would be to scrub it through water maybe? If we would be able to separate those two gasses we would then be able to determine all the concentrations individually by measuring the original air mixture and the scrubbed air mixture with two different sensors.