Comparative Study of Two Various Percent of CO Injection Effect to Cascade Methanol Synthesis Reactor in the Presence of Long-term Catalyst Deactivation
Volume 8, Issue 2, Spring 2011, Pages 69-80
M. Bayat, F. Rahmani, T. Ghiyami, M. R. Rahimpour
Abstract 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.
Investigation of CO Injection Effect on the Methanol Production in a Single Type Reactor in the Presence of Catalyst Deactivation
Volume 7, Issue 3, Summer 2010, Pages 29-48
F. Rahmani, M. Bayat, M. Haghighi, M. R. Rahimpour
Abstract In this work, the behavior of a single-type industrial methanol reactor while the 5% CO was injected into the 95% of feed was investigated. For the dynamic simulation purposed, a heterogeneous one-dimensional model has been developed in the presence of long term catalyst deactivation. The performance of the reactor with CO injection to the feed entrance was investigated and the product and reactant mole fraction profiles of the aforesaid reactor were compared with that of a conventional single type (CMR) and membrane methanol reactor (MMR). The simulation results represent 14.24% and
22.93% enhancement in the yield of methanol production in comparison with MMR and CMR, respectively, while 5% CO was injected into the 95% of the feed. Also, by CO injection to the feed, water production during methanol synthesis via CO2 hydrogenation which accelerates the catalyst deactivation and reduces methanol production rate, is reduced greatly. Additionally, nowadays CO is an important cause of pollution and a hazardous material in many industrial processes and using it in these processes is one of the ways to solve the pollution problem.