Process for de-ashing coal tar
US5534137A · kind A · utility
22Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Mar 21, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Described are novel processes for treating high-ash coal tars to produce coal tars which are suitable for distillation to form binder pitch. Preferred processes of the invention involve multi-stage centrifugations to reduce ash and preferably also quinoline insoluble levels. Processes of the invention also provide for the treatment of coal tar sludges to recover valuable coal tar distillate and dried, free-flowing coal related material having high fuel value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.