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Development of the Fisher-Tropsch reactor In addition to the development of catalysts for FT synthesis, the FT reactor system has been subject to changes and it was rebuilt a number of times during the HighBio and HighBio2 projects. In early spring 2013, the reactor was completely rebuilt and changed according to the suggestions and new ideas. The whole FT reactor system is now built into a framework of metal tubing that provides more flexibility for future changes. The gas feed system has been changed to allow much higher reaction pressures. The maximum pressure is now set to be 50 bar with a safety release valve opening at 60 bar. The higher pressure limits for the system makes it possible to perform other catalytic routes from the purified synthesis gas, such as methanol synthesis or dimethyl ether (DME) synthesis. Along with the increase in reaction pressure, the gas feed was changed to a one-bottle mix of syngas instead of mixing the gases with mass flow controllers. This change allows the use of a more exact gas composition between individual experiments. The most important changes have been made for the collection of reaction products. Both hot and cold pots have been changed in a way that allows much better condensation of the products. Better product condensation results in less risk for contamination of the tubing downstream from the collection points. Gas analysis was performed with an online gas chromatograph (GC) equipped with double detectors and double separation systems that provide information on the gaseous organic compounds formed and the consumption of individual syngas components. Information obtained from the GC provides a basis for a better understanding of the conversion levels during the experiments and the selectivity of the individual catalysts. Long-term stability of the catalysts can also be determined by the existing reactor system. The preliminary experiments performed with the modified reactor have been very promising. A single one-week experiment has now very high productivity. These experiments were performed with a conversion ratio around 50% and selectivity for C5+ (liquid or semi-solid hydrocarbons), and the results are comparable with the results of commercial FT catalysts. 83PDF Image | BIOMASS TO ENERGY AND CHEMICALS HighBio2 Project Publication
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