Coal liquefaction (CTL)

Indirect route
Coal liquefaction (CTL)

Authors : Raphael HUYGHE, Pierre MARION, Magalie ROY-AUBERGER

Review date: February 1, 2016 | Lire en français

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1. Indirect route

Indirect coal liquefaction involves the following steps (Figure1):

coal preparation;
oxygen production;
gasification with pure oxygen;
conversion of CO to H₂ (water gas shift);
purification of synthesis gas;
Fischer-Tropsch synthesis, FT (the core of the process);
HDI isomerization hydrocracking of long-chain paraffins to produce a "finished" fuel;
production of the pure hydrogen used by the hydrocracking unit;
generation of the electricity consumed by the complex;
acid gas treatment (Claus process).

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Ongoing reading
Indirect route

(1) - HIGMAN (C.), VAN DER BURGT (M.) - Gasification. - 2^nd Edition, Burlington (Mass.), Gulf professional (2008).
(2) - STEINBERG (A.), DRY (M.) - Fischer-Tropsch technology. - Studies in Surface Science and catalysis, 152, Amsterdam, Elsevier (2004).

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