Abstract
Oily sludge produced in the process of petroleum exploitation and utilization is a kind of hazardous waste that needs to be urgently dealt with in the petrochemical industry. The oil content of oily sludge is generally between 15–50% and has a great potential for oil resource utilization. However, its composition is complex, in which asphaltene is of high viscosity and difficult to separate. In this study, The oily sludge was extracted with toluene as solvent, supplemented by three kinds of ionic liquids (1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM] [BF4]), 1-ethyl-3-methylimidazole trifluoro-acetate ([EMIM] [TA]), 1-ethyl-3-methylimidazole Dicyandiamide ([EMIM] [N(CN)2])) and three kinds of deep eutectic solutions (choline chloride/urea (ChCl/U), choline chloride / ethylene glycol (ChCl/EG), and choline chloride/malonic acid (ChCl/MA)). This experiment investigates the effect of physicochemical properties of the solvents on oil recovery and three machine learning methods (ridge regression, multilayer perceptron, and support vector regression) are used to predict the association between them. Depending on the linear correlation of variables, it is found that the conductivity of ionic liquid is the key characteristic affecting the extraction treatment in this system.
Highlights
A large amount of oily sludge has been produced in the process of crude oil exploration, production, transportation, storage and refining [1]
When 20% water was added, the viscosity of choline chloride (ChCl)-malonic acid (MA) ionic liquid decreased by 90%, followed by the decrease of Choline chloride/urea (ChCl/U) by 85%, and the viscosity change of ChCl-EG decreased by 50% at least
The molecules in deep eutectic solvents are mainly connected by hydrogen bonds, forming a large number of hydrogen bonding network structures, and the addition of water is difficult to destroy the hydrogen bonding network structure, so the viscosity decreases more slowly [13]
Summary
A large amount of oily sludge has been produced in the process of crude oil exploration, production, transportation, storage and refining [1]. Sludge has become a serious environmental problem in many countries. Due to the large amount of toxic substances such as petroleum hydrocarbons in oily sludge, it is listed as hazardous waste in many countries. Among the existing oily sludge treatment methods, solvent extraction method has a good application prospect with the advantages of simple operation, high efficiency and short treatment time [2]. How to reduce the solvent loss in the extraction process and reduce secondary pollution is the key problem to be solved in the field of oil sludge extraction [3]
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