Extracting sulfur and ash

Patent · Tue Oct 25 04:00:00 EDT 1977

OSTI ID:6984763

Stambaugh, E P

A method is disclosed for extracting a substantial proportion of the pyritic, organic, and sulfate sulfur compounds and ash present in a solid carbonaceous fuel of the coal or coke type comprising mixing the fuel with an aqueous alkaline solution containing a sodium, calcium, or ammonium carbonate, hydroxide, sulfide, or hydrosulfide, or a plurality thereof, heating the resulting mixture to at least about 125/sup 0/C at a pressure of at least about 25 psig to leach out the sulfur compounds and ash, separating the easily removable leached out materials from the remainder of the fuel, and washing said remainder of the fuel. The concentration of alkali in the solution typically is about 1 to 35 percent by weight, and the mixture typically is heated for at least about 5 minutes at about 350/sup 0/C, about 1 hour at 300/sup 0/C, about 2 hours at 250/sup 0/C, about 4 hours at 200/sup 0/C, about 10 hours at about 125/sup 0/C, or for at least a time approximately proportionately between the foregoing times at an intermediate temperature. The pressure may be provided at least in part by oxygen, hydrogen, nitrogen, oxygen plus nitrogen or hydrogen plus nitrogen.

• Assignee: Battelle Memorial Inst.
• Patent Number(s): US 4055400
• OSTI ID: 6984763
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BATTELLE HYDROTHERMAL COAL PROCESS
BERYLLIUM
BORON
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHEMICAL REACTIONS
COAL
DEASHING
DESULFURIZATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
LEAD
METALS
NONMETALS
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
REMOVAL
SEMIMETALS
SULFUR
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE