聚醚铵盐D230^(2+)协同脂肪酸萃取处理油基钻屑

Polyether ammonium salt D230^(2+)synergized with fatty acid extraction for treatment of oil-based drill cuttings

以聚醚铵盐D230^(2+)协同脂肪酸,构建了一种新型开关溶剂体系,考察了该体系的开关性能以及对模拟总石油烃(TPH)的萃取分离效果,并将其用于油基钻屑(OBDC)的萃取处理。在聚醚铵盐D230^(2+)存在下,脂肪酸的亲疏水性可由CO_(2)/N_(2)可逆调控,实现TPH的分离和溶剂体系的回收。溶解度参数分析结果表明,月桂酸和肉豆蔻酸对TPH的溶解性最佳。以月桂酸为脂肪酸,在液固比6 mL/g、萃取温度70℃、搅拌转速400 r/min、搅拌时间40 min的优化条件下,OBDC残油率可达0.49%。4次循环萃取后溶剂体系的回收率仍保持在80.23%。聚醚铵盐D230^(2+)在界面的吸附改变了钻屑的润湿性,促进了重质组分的剥离,月桂酸溶解TPH并降低其黏度,二者协同实现了OBDC的强化萃取处理。

A novel switching solvent system was constructed by synergizing fatty acids with polyether ammonium salt D230^(2+).The switching performance of the system and its effect on simulated extraction and separation of total petroleum hydrocarbons(TPH)were investigated.The system was then used for the extraction of oil-based drill cuttings(OBDC).In the presence of polyether ammonium salt D230^(2+),the hydrophilicity of fatty acids could be reversibly regulated by CO_(2)/N_(2)to realize the separation of TPH and the recovery of the solvent system.The results of solubility parameter analysis show that lauric acid and myristic acid have the best solubility for TPH.With lauric acid as the fatty acid,the residual oil rate of OBDC reaches 0.49%under the optimized conditions with a liquid-solid ratio of 6 mL/g,extraction temperature of 70℃,stirring rotational speed of 400 r/min,and stirring time of 40 min.The recovery rate of the solvent system remains at 80.23%after four cycles of extraction.The adsorption of polyether ammonium salt D230^(2+)at the interface changes the wettability of the drill cuttings and promotes the stripping of the heavy components.The lauric acid dissolves the TPH and lowers its viscosity,which synergistically realizes the enhanced extraction treatment of OBDC.