Process for converting coal and/or heavy petroleum fractions...

C - Chemistry – Metallurgy – 01 – B

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C01B 3/26 (2006.01) C01B 3/02 (2006.01) C01B 3/38 (2006.01) C10J 3/00 (2006.01)

Patent

CA 1187702

ABSTRACT A PROCESS FOR CONVERTING COAL AND/OR HEAVY PETROLEUM FRACTIONS INTO HYDROGEN OR AMMONIA SYNTHESIS GAS. Hydrogen or ammonia synthesis gas consisting substantially only of hydrogen and nitrogen is prepared from coal and/or heavy petroleum fractions by gasification with steam and an oxygen-containing gas, cooling the thus- formed crude gas by quenching and/or steam production, scrubbing the cooled gas to remove soot and other solid impurities, re-heating by heat exchange with exit gas from a subsequent conversion step, shift-converting the re-heated, soot-free crude gas to convert its CO by passing the gas through one ore more catalyst beds of one or more sulfur- resistant shift catalysts, removing acid gases (notably H2S and CO2) from the shift-converted gas and finally subjecting the gas to a catalytic methanation to convert remaining amount of carbon oxides to methane. If the process is used for preparing ammonia syngas, the gasification is conveniently carried out with oxygen-enriched air and steam.

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