标题：Solid effect in solvent extraction treatment of pre-treated oily sludge
作者：Liang, Jiling; Zhao, Lingxi; Du, Na; Li, Haiping; Hou, Wanguo
作者机构：[Liang, Jiling; Zhao, Lingxi; Hou, Wanguo] Shandong Univ, Environm Res Inst, Jinan 250100, Peoples R China.; [Du, Na; Li, Haiping; Hou, Wanguo] Shan 更多
通讯作者地址：[Hou, WG]Shandong Univ, Environm Res Inst, Jinan 250100, Peoples R China.
来源：SEPARATION AND PURIFICATION TECHNOLOGY
关键词：Oily sludge; Solvent extraction; Solid concentration effect; Oil; recovery
摘要：Oil recovery from oily sludge generated from the petroleum industry has been investigated by solvent extraction using four organic solvents, cyclohexane, n-hexanol, n-butanol and kerosene. Special emphasis was placed on the effect of sludge (solid) concentration (C-s) on the oil recovery efficiency (R-o) and partition coefficient (K-D). The KD was found to vary with C-s. This phenomenon can be described as the "solid concentration effect" or "solid effect" (C-s-effect). The C-s-effect can be explained using the surface component activity (SCA) model that we developed previously. In this model, the activity coefficient of solid surface sites (f(s)) was proposed as a function of C-s rather than unity because of interactions among solid particles. Based on the SCA model, we provide a C-s-dependent function of partition coefficient (termed the SCA-partition coefficient function), in which the intrinsic (or thermodynamic) partition coefficient (K-D(0)) independent of C-s can be simulated from extraction experimental data and can be used to characterize the extraction equilibrium. It was confirmed that the SCA-partition coefficient function could describe the C-s-effect observed in our solvent extraction experiments accurately. In addition, the f(s) of the sludge was independent of the solvent in our tests and decreased with increasing temperature. (C) 2014 Elsevier B.V. All rights reserved.