Method of filtering molten coal
US4157305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1977 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Dec 1, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for filtering molten coal is provided. The process comprises the steps of providing a filter, passing a stream of molten coal which includes some solid material against said filter and filtering the solid material so as to form a filter cake on and to pass a filtrate through said filter, directing a stream of inert gas against said filter cake so as to dry the same to a predetermined low moisture content, centrifuging said dried filter cake off said filter, separating from the filter cake a fraction composed of fine particles, adding said separated fine particles to a stream of molten coal upstream of said filter, and passing said stream of molten coal and separated fine particles against said filter, whereby said fine particles act as a filter aid for the filtration of the molten coal. The process can also comprise adding calcium oxide or an inorganic salt to a stream of molten coal whereby the added compound acts as a filter aid, and subsequently recovering the added compound and again adding it to a stream of another coal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.