The design and operation of the process to extract aromatics from petroleum intermediates via solvent extraction can be enhanced in terms of efficiency by access to liquid–liquid equilibrium (LLE) data. This study serves to contribute LLE data for a heavy alkane, aromatic, and solvent mixture, which is of limited availability in the open literature. Ternary LLE phase compositions were experimentally measured and thermodynamically modeled for the systems N-formylmorpholine (NFM) + toluene + (n-nonane or n-decane) at 303.2, 323.2, and 343.2 K and 101.3 kPa. The direct analytical method was used to obtain the LLE data using a double-walled glass cell. The phase equilibrium samples were quantitatively analyzed using gas chromatography. The ternary systems were successfully correlated using the non-random two-liquid and universal quasichemical thermodynamic models. The effectiveness of using NFM as an alternative solvent to extract toluene from a mixture containing n-nonane or n-decane was evaluated by determining the selectivity. The plait point for the systems measured was determined using the graphical Coolidge method. All systems studied were found to exhibit type I ternary LLE behavior, and relative selectivity was greater than unity, indicating that the extraction of toluene from heavy alkanes is feasible using NFM.

中文翻译：

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（303.2、323.2和343.2）K和101.3 kPa时N-甲酰基吗啉+甲苯+ { n-壬烷或n-癸烷}系统的三元液-液相平衡数据

通过访问液-液平衡（LLE）数据，可以提高通过溶剂萃取从石油中间体中萃取芳烃的方法的设计和操作。这项研究有助于提供重链烷烃，芳烃和溶剂混合物的LLE数据，这在公开文献中是有限的。对系统N-甲酰基吗啉（NFM）+甲苯+（n-壬烷或n-癸烷）在303.2、323.2和343.2 K和101.3 kPa时。使用直接分析方法使用双壁玻璃池获得LLE数据。使用气相色谱法定量分析相平衡样品。使用非随机两液和通用准化学热力学模型成功地关联了三元系统。使用NFM作为替代溶剂从含正壬烷或正壬烷的混合物中萃取甲苯的有效性通过确定选择性评估-癸烷。使用图形柯立芝方法确定所测系统的褶点。发现所有研究的系统都表现出I型三元LEE行为，并且相对选择性大于1，这表明使用NFM从重烷烃中提取甲苯是可行的。