Patent ID: 7481908
Filing Date: 2009-01-27
Classification: B01D,C07C,C10C

Abstract:
1. A process for obtaining phenanthrene of about 95% purity from coal tar containing acenaphtene, flourene, anthracene, carbazole, pyrene and phenanthrene, said process comprising the steps of: a) fractional distillation of coal tar at a reduced pressure of 50 mm Hg; b) heating the coal tar at a temperature of 160° C. to 180° C. to obtain vapors; c) condensing the vapors to obtain a first distillate fraction containing acenaphthene and flourene; d) obtaining a second distillate fraction at 200° C. to 230° C. containing phenanthrene, anthracene and traces of carbazole; e) re-distilling the second distillate fraction at a temperature range of 210 to 224° C. to obtain phenanthrene of about 95% purity and a residue which is again used for the recovery of residual phenanthrene by redistillation at a temperature range of 210° C. to 224° C.