Kemisk absorption av koldioxid efter en Water-Gas Shift-reaktor

Abstract

The aim of this bachelor thesis is to create a reactor for carbon dioxide capture to use in between a water-gas shift reactor and a methanisation reactor in a process for creating methan gas from biomass. The reactor built in this study is set up from glas flasks with gas distributor and uses chemical absorption of carbon dioxide in sodiumhydroxide with calciumhydroxide added. Laborative experiments were made where different parameters were changed in order to reach optimal absorption of carbon dioxide from a gas stream with 20 % carbon dioxide. Complete absorption was acquired when two reactor flasks were put in series, each containing a sodium hydroxide solution with pH 13 and 3,66 g calciumhydroxide. A comparison between two different catalysts intended for use in a water-gas shift reactor with 3 respectively 5 weight-% of palladium was performed. Based on made experiments it cannot be concluded if the conversion is influenced by the amount of palladium in the catalysts. Evaluation of the absorption reactor created in this bachelor project leads to the conclusion that it is most probably not suitable for a fullscale process plant, but is on the other hand good for use in demonstrative purposes since the set is both simple and visual.