Comparative Study of Two Various Percent of CO Injection

In this paper, a heterogeneous one-dimensional model for simulation of cascade methanol reactor has been developed, while the various percent of CO was injected to these reactors. In the cascade reactor configuration, a system with two-catalyst bed instead of one single catalyst bed is applied for methanol synthesis. In the first catalyst bed, the synthesis gas is partly converted to methanol in a water-cooled reactor. In the second bed, which is a gas-cooled reactor, the reaction heat is used to preheat the feed gas to the first bed. In this study, the various percent CO injections of feed entrance (1% and 2%) to different reactors (first and second reactor) of conventional dual type methanol reactor have been considered. The simulation results represent 5.127% and 4.158% enhancement in the yield of methanol production in comparison with conventional dual type methanol reactor (CDMR) and membrane dual type methanol reactor (MDMR) respectively, while 2% CO was injected to the first reactor. Also, by CO injection to the feed, water produced during methanol synthesis via CO2 hydrogenation which accelerates the catalyst deactivation and reduces methanol production rate, is reduced greatly.