Solvent extraction o fnitrogen heterocyclic compounds contained in coal tar absorption oil fracton-improvement of separation performance by addition of aluminum chloride to solvent-

摘要

The liquid-liquid equilibrium properties betweent he coal tar absorption oil fraction feed and the solvent (aqueous solution of methanol and aluminum chloride) were experimentally measured for nitrogen heterocyclic compounds (2,3-benzopyridine(quinoline),3,4-benzopyridien (isoquinoline),and 2,3-benzopyrrole (indole)),homocyclic compounds (aromatics),and oxygen heterocyclic compounds.Nitrogen compounds were extracted preferentially to the other compounds,and no oxygen compound was detected in the extract under all conditions.The distribution ratios of nitrogen compounds and aromatics increased with a larger mass fraction of AlCl_3 in the extract.This increase in the distribution ratio was especially large for quinoline and isoquinoline,and the maximum ratios of quinoline and isoquinoline were 26 and 85 times larger,respectively,than in the cases without AlCl_3 in the extract,and the maximum ratios were 5 and 17 times higher than in the cases without AlCl_3.The separaton selectivity for indole was apparently not affected by the addition of AlCl_3.