When hydrogen comes out of an industrial electrolyser it needs to pass through a gas-liquid separator as a fair amount of water bubbles out of the reactor with it. That part is simple to understand and design. My trouble is understanding why every hydrogen company then passes the hydrogen stream through a “scrubber”. It’s claimed that it gets rid of any residual KOH in the hydrogen. Is this KOH as a vapor or KOH as a mist still dissolved in the water?
Hi Daniel Kane,
in my opinion Electrolyte aerosols carried along in the hydrogen (product gas) are removed in the scrubber. Deionized water is pumped from a water reservoir into the gas scrubber as washing water, where it binds the majority of the aerosols carried in the gas.
An aerosol is a dynamic system and is subject to constant changes due to the condensation of vapors on existing particles, the evaporation of liquid components of the particles, the coagulation of small particles into large ones or the deposition of particles on surrounding objects.
If you have further questions about partial pressure and evaporation of KOH, please write.
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