The raw gas for variable pressure adsorption contains H2S, which needs to be removed if it is greater than 20 ppm, taking into account the life of the adsorbent and the quality of the product. the removal of H2S can be done by a dry desulphurisation process using a fixed bed with a room temperature iron oxide desulphurising agent inside. Desulphurisation towers can usually be set up as two or more, according to the amount of gas source, desulphurisation agent sulphur capacity, stack density and replacement cycle and other indicators to design the filling volume of the desulphurisation tower in small air separation unit, the configuration of the desulphurisation tower considered can be connected in parallel or in series, in series can be before or after. Usually used in series, the front of a tower fully saturated no use value after replacement, not replaced in front, the new replacement in the back, which can improve the utilization rate. The same dry process can be used to remove ammonium from rectified gas, naphthalene from coke oven gas, tar from coke oven gas, etc., but with a different filling agent. The advantage of using this method to remove impurities from the feed gas is that it is easy to operate in small air separation unit, has almost no energy consumption and can fix the impurities in the stripper; the disadvantage is that the stripper needs to be replaced after saturation and the solid waste from the replacement needs to be disposed of.
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