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

Patent · Fri Jan 01 00:00:00 EST 1988

OSTI ID:866603

Khan, M Rashid ^[1]

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1. Morgantown, WV

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.degree. to 700.degree. 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 -C.sub.8 hydrocarbons and a reduction in H.sub.2 S over gas obtainable by pyrolyzing cola 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: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4747938
• OSTI ID: 866603
• Country of Publication: United States
• Language: English

Related Subjects

temperature
pyrolysis
coal
oil
shale
presence
calcium
compounds
technique
process
described
particulate
pyrolyzed
21
wt
compound
selected
oxide
calcined
hydrate
dolomite
produce
quality
hydrocarbon
liquid
combustible
product
gas
characterized
sulfur
content
achieved
heating
coal-calcium
mixture
relatively
slow
rate
450
degree
700
duration
10
60
minutes
fixed
moving
bed
reactor
exhibits
increased
yield
hydrogen
-c
hydrocarbons
reduction
obtainable
pyrolyzing
cola
obtained
sufficient
permit
directly
fuel
reduced
oxygen
inhibits
polymerization
storage
moving bed
reduced sulfur
coal pyrolysis
hydrocarbon liquid
oxygen content
compound selected
sulfur content
product gas
bed reactor
calcium oxide
oil shale
liquid product
particulate coal
calcium compound
relatively slow
compound mixture
combustible product
increased yield
calcium compounds
/208/48/201/