| US 7,481,908 B2 | ||
| System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction | ||
| Kaushal Kishore Tiwari, Jharkhard (India); Sukuru Ramakrishna Rao, Jharkhard (India); Sanjay Kumar Thakur, Jharkhard (India); and Somnath Banerji, Jharkhard (India) | ||
| Assigned to Council of Scientific & Industrial Research, New Delhi (India) | ||
| Filed on Mar. 26, 2002, as Appl. No. 10/107,284. | ||
| Prior Publication US 2003/0183499 A1, Oct. 02, 2003 | ||
| Int. Cl. B01D 3/14 (2006.01); B09B 3/00 (2006.01); C10C 1/04 (2006.01) | ||
| U.S. Cl. 203—74 [201/3; 201/21; 201/24; 201/30; 203/80; 203/87; 208/42] | 2 Claims |
| 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.
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