Hydrogen and carbon dioxide recovery from the petrochemical flare gas to methanol production using adsorption and absorption combined high-efficient method

摘要

Today, one of the challenging issues all over the world is the global warming which can be attributed to the emission of greenhouse gases into the environment as well as burning of gases in fare gas stream of industrial units. The latter can not onlycause environmental problems but also is accompanied by wasting a great deal of energy. To deal with the aforementionedissue, the fare gas stream can be recycled after separating some species. In this investigation, the objective is to separateCO2 and H2 from the fare gas in addition to methanol production. In this regard, a separation with sorbent/solvent methodis used which is divided into two stages: (1) H2 separation by sorbent, (2) CO2 separation by monoethanolamine solvent.From the obtained results in this study, in the frst stage, H2 and CO2 can be purifed up to 75% and 99.83%, respectively.Beside, methanol synthesis is compared in three diferent cases: (1) industrial unit, (2) CO2 is fed into the reactor insteadof CO, and (3) CO2 and H2 are fed to the reactor with stoichiometric coefcients. The obtained methanol production of thecase (1) is approximately close to that of the case (3) and it is reduced 4% in case (3).