Experimental investigation of sulfur compounds removal from synthetic quaternary gas condensate system using ultrasound assisted oxidative desulfurization (UAOD) method

Subject Areas : Others

Ameneh Taghizadeh ¹ , مریم آسمانی ² , Fereidoon Esmaeilzadeh ³ , Abolhasan Ameri ⁴

1 - Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 - Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
3 - Department of Chemical Engineering; School of Chemical, Petroleum and Gas Engineering, Shiraz University, Shiraz, Iran
4 - Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Received: 2024-11-26 Accepted : 2025-01-10 Published : 2025-01-20

Keywords: Ultrasound, Gas condensate, Experimental design. ,

Abstract :

In addition to natural gas, gas condensates are also produced from gas reservoirs. The presence of any of the pollutants, such as sulfur compounds, can cause problems in downstream industries or damage the environment. In this research, the desulfurization of a synthetic quaternary gas-condensate system containing of normal heptane with different combinations of tert-butyl mercaptan (aliphatic thiol), dipropyl sulfide (aliphatic sulfide), and benzo thiophene (aromatic thiophene) in the range of 0-3000 ppm were treated using UAOD process. For this purpose, different operating variables including H₂O₂ (10- 70% v/v), CH₂O₂ (5- 70% v/v), H₃P(W₃O₁₀)₄ (1- 30% w/w), C₄H₁₀O (1- 30 % v/v) and sonication (5- 40 min) were examined upon the desulfurization efficiency. The design of the experiments was performed by the response surface method of the central composite design model. And then N, N-dimethylformamide solvent was used to extract oxidized sulfurous compounds from n-heptane. Residual sulfur was analyzed by ASTM D7039 standard method. Maximum desulfurization efficiency, 99.92%, for C₄H₁₀S= 1105.99 ppm, C₆H₁₄S= 2252.50 ppm, C₈H₆S= 2965.48 ppm in 20 mL n-heptane was obtained at H₂O₂= 23.57% v/v, CH₂O₂= 49.27% v/v, H₃P(W₃O₁₀)₄= 21.15% w/w, C₄H₁₀O= 24.56% v/v and sonication time= 21.17 min. Additionally, an empirical model was proposed to predict desulfurization efficiency with an error of less than 0.1%.

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