Study on the performance and stability of oily sludge, hydrocracking tail oil, and water mixture

被引：0

作者：

Yang, Song ^{[1
]}

Zhang, Weixiang ^{[1
]}

Li, Taizhi ^{[1
]}

Zhong, Mei ^{[1
]}

Dai, Zhenghua ^{[1
,2
]}

Wang, Fuchen ^{[2
]}

机构：

[1] State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, School of Chemical Engineering and Technology, Xinjiang University, Urumqi

[2] East China University of Science and Technology, Shanghai

来源：

Journal of Molecular Liquids | 2024年 / 415卷

关键词：

Binary complex surfactant; Extended DLVO theory; Oil slurry; Stability; Viscosity reduction;

D O I：

10.1016/j.molliq.2024.126362

中图分类号：

学科分类号：

摘要：

Oil refineries generate oily sludge (OS), a toxic byproduct that poses significant handling challenges. Additionally, refineries produce hydrocracking tail oil (HTO), a carbonaceous byproduct. Co-gasification of OS and HTO offers a promising solution for the sustainable utilization of OS and other hazardous wastes. However, the high viscosity of the OS and HTO mixture complicates the gasification process. In this study, a mass ratio of 1:1:0.27 for OS, HTO, and water, respectively, was selected, with water content of 40 %. TX-100 and SDBS were screened from a group of 14 surfactants for their effectiveness in reducing viscosity. These two surfactants were combined to form a binary mixture aimed at further lowering viscosity. The results showed that with a 1 % addition of TX-100 and SDBS, the viscosity initially decreased, then increased, reaching its lowest point at 185.8 mPa·s with a ratio of 8.33:1.67. Rheological analysis indicated that the mixture exhibited pseudo-plastic fluid behavior, characteristic of shear-thinning. The variation in surface tension followed a trend similar to that of viscosity, with the surface tension reaching 27.99 mN/m at the 8.33:1.67 ratio. At this ratio, the mixture achieved a maximum potential of −10.79 mV, indicating effective sludge stabilization. Additionally, when TX-100 and SDBS were combined at the 8.33:1.67 ratio, the contact angle was measured at 39.5°. The mixture remained stable for 40 min after blending, with a Turbiscan stability index (TSI) value below 0.117, confirming its stability. This stability in the mixture of OS, HTO, and water is promising for the material transport of the sludge mixture. Using the extended DLVO theory, the interaction energies within the mixture containing 1 % of the binary surfactant were calculated. The total interaction energy of the sludge mixture was found to be 2.49 × 10−13 J. The surfactant played a key role in stabilizing the system's dispersion, contributing a spatial site-distortion interaction energy of 2.45 × 10−13 J. © 2024

引用

共 65 条

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