Abstract
Anthracene and carbazole are both highly value-added products in the anthracene fraction of coal tar, and it is a difficult task to separate and purify anthracene and carbazole from the anthracene fraction/crude anthracene, which consists of many components, differing only slightly in boiling points. To seek a highly efficient solvent to separate carbazole from crude anthracene, the solubilities of anthracene and carbazole in tetrachloroethylene (PCE) and the mixtures of xylene + PCE, N,N-dimethylformamide (DMF) + urea, and DMF + H2O were measured. The separation efficiencies of DMF + 30% H2O, DMF + urea, and DMF + isopropanolamine mixtures with different percentages of urea or isopropanolamine were examined by the cooling crystallization process. Chlorobenzene, PCE, and xylene + 40% PCE mixture were used in the carbazole refining process. The results showed that, with the addition of the third component of urea, isopropanolamine, or water to DMF, the solubility of anthracene and carbazole is inhibited to...
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