Low temperature pyrolysis of coal or oil shale in the presence of calcium compounds

Patent · Tue May 31 00:00:00 EDT 1988

OSTI ID:7098538

Khan, M R

A coal pyrolysis technique or process is described in which particulate coal is pyrolyzed in the presence of about 5 to 21 wt % of a calcium compound selected from calcium oxide, calcined (hydrate) dolomite, or calcined calcium hydrate to produce a high quality hydrocarbon liquid and a combustible product gas which are characterized by low sulfur content. The pyrolysis is achieved by heating the coal-calcium compound mixture at a relatively slow rate at a temperature of about 450 to 700/sup 0/C over a duration of about 10 to 60 minutes in a fixed or moving bed reactor. The gas exhibits an increased yield in hydrogen and C/sub 1/ to C/sub 8/ hydrocarbons and a reduction in H/sub 2/S over gas obtainable by pyrolyzing coal without the calcium compound. The liquid product obtained is of a sufficient quality to permit its use directly as a fuel and has a reduced sulfur and oxygen content which inhibits polymerization during storage.

• Research Organization: USDOE Morgantown Energy Technology Center (METC), WV (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: EDB-87-062074
• Assignee: Dept. of Energy
• Patent Number(s): 4,747,938
• Application Number: 06/853,117
• OSTI ID: 7098538
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
04 OIL SHALES AND TAR SANDS
COAL
PYROLYSIS
OIL SHALES
CALCINATION
CALCIUM HYDROXIDES
CALCIUM OXIDES
CHEMICAL REACTORS
DOLOMITE
GAS YIELDS
HEATING RATE
HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BITUMINOUS MATERIALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES
YIELDS
010409* - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)
040402 - Oil Shales & Tar Sands- Surface Methods