Aromatics stemming from coal gasification

The Fischer-Tropsch synthesis leads almost exclusively to aliphatic hydrocarbons and oxygen compounds the proportion of aromatics depends on the type of reactor system used. The aromatics content of the gasoline and diesel oil produced by the fixed-bed process in the SASOL I plant is negligible, while the aromatics content of gasoUne produced by the fluidized-bed method by SASOL II and III is around 7%, and the level in diesel oil 10%. The increase in aromatics with the fluidized-bed reactor is a result of the reaction temperature, which is approximately 100 °C higher. Since the concentration is rather low, it is not economical to 

There are currently three industrially-proven methods for coal gasification, namely fixed-bed gasification (e.g. Lurgi), fluidized bed reactors (e.g. Fritz Winkler (BASF)) and entrained bed processes (e.g. Texaco, Koppers-Toizt, Other processes are being developed, e.g. coal gasification in an iron bath. 

Physical form Bulk material Fluidized bed Flowing 

Movement of fuel Counter current Turbulant co-current Co-current 

Fuel specification should not cake highly reactive ash melting point 

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