EXTRACTION OF CONDENSED AROMATIC-HYDROCARBONS WITH POLAR ORGANIC-SOLVENTS

The distribution of condensed aromatic hydrocarbons containing 2-5 ''j oined'' aromatic rings per molecule between octane and polar organic s olvents of different nature has been studied at a temperature of 20 de grees C + 1 deg. The dependences of the distribution constants of cond ensed aromatic hydrocarbons on the number of aromatic rings per molecu le, the type of joining and the nature of the polar organic solvent ha ve been established. The solvent groups characterized by different ord ers of extractability of condensed aromatic hydrocarbons have been det ermined. It has been shown that the extraction of substituted condense d aromatic hydrocarbons, in contrast to that of sunstituted benzenes, cannot be described from positions of the principle of additivity of t he free energy of distribution. The basic possibility of extraction se paration of condensed aromatic hydrocarbons and their isolation from h ydrocarbon feedstock and surrounding media has been demonstrated. (C) 1998 Elsevier Science Ltd. All rights reserved.