加氢粗苯烷烃分离的汽液平衡研究

STUDY ON VAPOR-LIQUID EQUILIBRIA FOR SEPARATING THE ALKANE FROM THE HYDROREFINING CRUDE BENZOL

针对焦化苯加氢油采用Ｎ－甲酞吗啉溶剂萃取精馏分离烷烃的需要，在常压和３个温度（６５．２℃，７２．５℃和 ７９．５℃）下测定了苯－环已烷－ＮＦＭ、苯－正庚烷－ＮＦＭ及苯－甲基环已烷－ＮＦＭ ３个三元体系共 ９组汽液平衡数据．用 ＮＲＴＬ和 ＵＮＩＱＵＡＣ模型关联参数．结果表明，两种模型关联汽相组成的平均偏差均小于０．００９ ４，当溶剂比在２～４之间时，烷烃／苯的相对挥发度达到５．０左右．

In order to recover aromatics from hydrorefining crude benzol by extractive distillation with N-formylmorpholine as a solvent,vapor-liquid equilibrium (VLE) data for three ternary systems of benzene-hexane-NFM, benzene-heptane-NFM and benzene-methylcyclo- hexane-NFM were determined at normal pressure and three different temperature (65. 2 ℃, 72. 5 ℃and 79. 5℃ ). The experimental VLE data were correlated by the NRTL and UNIQUAC mo- dels respectively. The results shown that the average deviation of vapor compositions predicted by both models compared with experimental data are less than 0. 009 4,and relative volati1ity α of alkane/benzene was about 5 when the solvent/feed ratio between 2-4.