Process for upgrading coal
Patent
·
OSTI ID:5603444
This patent describes a process for reducing the sulfur content and ash content of a feed coal containing sulfur and mineral matter. It comprises: treating the feed coal in a reaction zone with fused alkalimetal caustic at an elevated temperature to remove mineral matter and sulfur from the feed coal, yielding a caustic-treated coal containing chemically bound alkali; washing the caustic-treated coal with water to yield water-washing coal and a caustic-rich water; washing the water-washed coal with carbonic acid for releasing chemically bound alkali from the water-washed coal to yield carbonic acid-washed coal and an alkali metal carbonate solution; and washing the carbonic acid-washed coal with an acid stronger than the carbonic acid to yield product coal having a sulfur content lower than the sulfur content of the feed coal and an ash content lower than the ash content of the feed coal, and spent acid.
- Assignee:
- TRW Inc., Redondo Beach, CA (USA)
- Patent Number(s):
- US 5059307; A
- Application Number:
- PPN: US 7-419659
- OSTI ID:
- 5603444
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
010800 -- Coal
Lignite
& Peat-- Waste Management
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONIC ACID
CHEMICAL FEEDSTOCKS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CLEANING
COAL
DESULFURIZATION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATERIALS
OXYGEN COMPOUNDS
PURIFICATION
REACTION KINETICS
SULFUR CONTENT
WASHING
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
010800 -- Coal
Lignite
& Peat-- Waste Management
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONIC ACID
CHEMICAL FEEDSTOCKS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CLEANING
COAL
DESULFURIZATION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATERIALS
OXYGEN COMPOUNDS
PURIFICATION
REACTION KINETICS
SULFUR CONTENT
WASHING