skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Inventors:
 [1]
  1. Morgantown, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
866603
Patent Number(s):
4747938
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C10 - PETROLEUM, GAS OR COKE INDUSTRIES C10G - CRACKING HYDROCARBON OILS
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Khan, M Rashid. Low temperature pyrolysis of coal or oil shale in the presence of calcium compounds. United States: N. p., 1988. Web.
Khan, M Rashid. Low temperature pyrolysis of coal or oil shale in the presence of calcium compounds. United States.
Khan, M Rashid. Fri . "Low temperature pyrolysis of coal or oil shale in the presence of calcium compounds". United States. https://www.osti.gov/servlets/purl/866603.
@article{osti_866603,
title = {Low temperature pyrolysis of coal or oil shale in the presence of calcium compounds},
author = {Khan, M Rashid},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

Save / Share: