China Petroleum Processing & Petrochemical Technology ›› 2023, Vol. 25 ›› Issue (1): 91-104.

• Process Research • Previous Articles     Next Articles

Efficient Absorptive Oxidation of H2S Using a Fe(III)-Cu(II) Coupled DES (ChCl/EG) Desulfurizer

Jin Zhaobo; Wang Xuening; Wang Yingjie; Liu Zhihao; Chen Hongyuan; Liu Jiawei; Qiu Kui   

  1. School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331
  • Received:2022-10-19 Revised:2022-11-26 Online:2023-03-30 Published:2023-03-30
  • Contact: Kui QIU E-mail:qiucqust@163.com

Abstract: Abstract: 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.

Key words: deep eutectic solvent, H2S, desulfurization, redox method