Hydrogen purification
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What is the technology to further purify 99.9% hydrogen to 99.9999%?
Among the hydrogen concentration processes known to date, pressure swing adsorption can achieve 99.999%. I’ve also heard that there are systems capable of achieving 6 nines; to increase the concentration by even a little, higher costs are required
To achieve a purity of 6N in hydrogen, specific processes are required to remove impurities, and pressure swing adsorption can provide the raw material for the production of 6N hydrogen. For ultra-high purity hydrogen, the impurities that need to be controlled generally include nitrogen, oxygen, water, carbon monoxide, carbon dioxide, etc. For electronic-grade applications, there are also additional specific impurities to consider. The removal of these impurities is generally achieved primarily through chemical adsorption; in addition, the equipment and pipelines used in the process require very high standards in terms of technology and material quality.
Pressure swing adsorption has a low yield and is not economical