Objective The aim is to remove the SO2 impurities in the alkylated C4 as the raw material of the mixed dehydrogenation device and control the SO2 volume fraction less than 1 X 10-6.Methods The liquid-phase high-precision adsorption desulfurization process was used to achieve continuous operation by adsorption regeneration.When the raw material was saturated by removing SO2 with adsorption,the adsorption capacity of SO2 adsorbent could be restored by means of nitrogen cycle replacement,heating stripping and air regeneration in the process,and put into production again to ensure the safe,stable and long-term operation of the unit.Result The SO2 volume fraction in alkylated C4 could be removed from 30 × 10-6-400× 10-6 to less than 1 × 10-6 by adopting the liquid-phase high-precision adsorption desulfurization process.Conclusions The adsorbent and process flow of the adsorption desulfurization process were optimized and adjusted,which shortened the regeneration time of the adsorbent and ensured the continuous operation of the device industrialization.At the same time,the liquid phase high-precision adsorption desulfurization process is simple to operate,which has low energy consumption and safety risk.
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