Abstract:
Objective Deep eutectic solvent (DES) has a certain research foundation in the field of gas absorption. In view of its cheap and easy-to-obtain raw materials, simple preparation method, and green environmental protection, it is an industrial solvent which can replace ionic liquids. The solvent has broad application prospects which can be used to solve the industrial problem of H2S removal in small and medium-scale conventional sour natural gas.
Methods FeCl3/EG deep eutectic solvent was prepared by ferric chloride hexahydrate and ethylene glycol(EG), and anhydrous copper chloride(CuCl2) was added in it to promote H2S absorption, and finally FeCl3/EG-CuCl2 was synthesized as a DES desulfurizer. The influence of factors such as the ratio of desulfurizer raw materials, reaction temperature and CuCl2 concentration on the desulfurization performance was focused on, and the regeneration conditions were explored.
Results The FeCl3/EG deep eutectic solvent with a raw material molar ratio of 1∶1 had a better desulfurization effect. Appropriately increasing the reaction temperature and CuCl2 concentration was more conductive to promoting H2S absorption. The desulfurizer could be regenerated by introducing oxygen, and the desulfurization performance would not change much after repeated desulfurization-regeneration. The desulfurization product was characterized by XRD as rhombic sulfur(α-sulfur).
Conclusions The DES desulfurizer can efficiently absorb H2S and convert it into elemental sulfur, realize the recycling of sulfur and provide a reference for the process of removing H2S from natural gas.
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