Coke oven gas-to-liquid synthesis: Experimental approach

Abstract

Carbon resource utilisation is one of the many options to reduce carbon emissions and create additional value from ecological and economic points of view. The utilisation of e.g. process or residue gases is carried out through different technological process steps, including various technologies to convert carbon-rich gases to high value-added products in the form of hydrocarbon (HC) compounds. Several types of residue gas from the iron, steel and coke industries containing different types of elements such as H2, CH4 and CO are valuable feedstock for carbon utilisation systems. In this study, the possibility of coke oven gas (COG) conversion to HCs using a cobalt catalyst was examined. For a better understanding of the whole process, chromatographic analysis was performed to determine the exact composition of the HC chains synthesised from the COG. The results had shown the efficiency of the liquefaction very close to 20 % w/w for every investigated temperature regime, however, the character of the produced hydrocarbon chains varied. The findings suggest increased production of alcohols of C4 to C9 groups in lower temperatures, while a broad range of alkanes and alkenes C7 to C19 can be efficiently produced if the synthesis temperature is increased.

Keywords

• Coke oven gas
• Liquefaction
• Fischer-Tropsch synthesis
• Circular economy