EXPERIMENTAL STUDY ON THE OXIDATIVE ABSORPTION OF H2S BY CuCl2 IN COOPERATION WITH FeCl3/UREA DEEP EUTECTIC SOLVENT
In order to solve the problem of removing H2S from small to medium-scale conventional sulfur-containing natural gas,a kind of FeCl3/UREA deep eutectic solvent(DES)was synthesized from UREA and ferric chloride hexahydrate(FeCl3·6H2O)with addition of CuCl2 to obtain FeCl3/UREA-CuCl2 desulfurizer.The structure and thermal stability of the DES were determined,and the effects of raw material ratio,CuCl2 concentration,H2S gas flow rate and temperature on the desulfurization performance were investigated through desulfurization experiment,and the regeneration process was also investigated.The results showed that the DES could exist stably at 80 ℃,and the DES with molar ratio of FeCl3/UREA of 1∶1 had better desulfurization performance.The introduction of CuCl2 could significantly improve the desulfurization performance,the maximum sulfur capacity was 9.64 g/L.The desulfurizer is more suitable for desulfurization at lower gas flow rate and can be regenerated by passing O2.The effect of the desulfurizer has little change after repeated use.The product of desulfurization is high purity rhombohedral sulfur(α-sulfur).The desulfurizer has the advantages of low cost of raw materials,simple synthesis,and high efficiency of oxidation and absorption of H2S and conversion of H2S into high purity sulfur,which can provide a reference for industrial natural gas desulfurization.
deep eutectic solventdesulfurization solutionhydrogen sulfidesulfurwet oxidation
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