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Four coals of different rank (one anthracite, one bituminous and two lignites) were flash-pyrolysed at temperatures between 700 and 1200°C in a heated wire mesh reactor at atmospheric pressure. The yields of volatile sulfur-containing products (H 2 S, COS, CS 2 and thiophenic compounds) were determined as a function of pyrolysis temperature by gas chromatography with flame photometric...
The properties of chars derived from coals of a wide range of rank produced in wire-mesh (WMR) and entrained-flow (EFR) reactors were compared. The WMR was operated at atmospheric pressure of helium or nitrogen with heating rates of 2-5000 K s -1 , temperatures up to 1773 K and residence time of 2-30 s. The EFR was operated at 1273 K with a residence time of 1 s in nitrogen at atmospheric...
Atmospheric-pressure temperature-programmed reduction (t.p.r.) was used to follow in pyrolysed subbituminous coal the changes in amount of pyrite and in organic sulfur groups as a function of temperature. At higher pyrolysis temperatures, pyrite and aliphatic and mixed aliphatic-aromatic sulfides disappeared systematically and more complex sulfur compounds such as aromatic sulfides and simple thiophenic...
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