Hydrogen-carbon monoxide ratio liquid reaction products

In practice, the Fischer-Tropsch reaction is carried out at temperatures of 200°C-350°C (390°F-660°F) and at pressures of 75-4000 psi. The hydrogen/carbon monoxide ratio is usually 2.2 1 or 2.5 1. Since up to three volumes of hydrogen may be required to achieve the next stage of the liquids production, the synthesis gas must then be converted by means of the water-gas shift reaction to the desired level of hydrogen ... 

I.G. Farbeninduslrie, Rheinpreussen, and others—modification of medium-pressure synthesis with iron catalysts (hot-gas recycle, oil slurry, oil recycle). Hot gas recycle. As already discussed, recycle operations (with removal of liquid reaction products after each step) with a ratio of recycle gas to fresh feed of 1 1 tconsumption ratio of hydrogen to carbon monoxide, increase in some cases the olefin content of the products and the total yields, and result in a smoother operation which can be important for the lifetime of the catalysts. 

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