摘要
In this experiment,an EG/ChCl deep eutectic solvent(DES)was synthesized using choline chloride(ChCl)and ethylene glycol(EG)as the raw materials.The synthesized DES was characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis.The results demonstrate the successful synthesis of DES.A certain amount of FeCl_(3) and CuSO_(4) was added to the DES to promote the absorption of H_(2)S;thus,a Fe(Ⅲ)-Cu(Ⅱ)coupled DES desulfurization system was obtained.The effects of DES raw materials’ratio,FeCl_(3) concentration,water content,CuSO_(4) concentration,and reaction temperature on the desulfurization efficiency and the regeneration conditions were studied.The results show that ChCl/EG DES with a molar ratio of 1:2 has a better desulfurization effect,and the addition of an appropriate amount of water can effectively promote the dissolution of CuSO_(4) and the absorption of H_(2)S.An appropriate increase in reaction temperature and CuSO_(4) concentration would also promote the absorption of H_(2)S.When the concentration of CuSO_(4) in DES desulfurizer was 0.15 mol/L,the gas speed was 20 mL/min,and the sulfur capacity could reach 10.23 g/L.The desulfurizer could be regenerated by passing O_(2),and the desulfurization efficiency did not change much after repeated use of desulfurization-regeneration many times.The desulfurization product was characterized by XRD as rhombohedral sulfur.
基金
China National Science and Technology Major Project(2016ZX05017)
Sinopec Group Corporation 2020 Science and Technology Project“Organic Sulfur Catalytic Hydrolysis Technology Improves Quality Research”(No.120049-1).
