Investigating the Chemical Mechanisms of CO۲ Absorption and Conversion

In the present study, the chemical mechanisms of CO۲ absorption and conversion have been investigated. Today, it is widely assessed that greenhouse gas (GHG) emissions are one of the most challenging environmental issues and carbon dioxide is the largest source of human GHG. Greenhouse gas emissions have increased dramatically since the beginning of the industrial era until ۲۰۱۸: In ۲۰۱۸, average CO۲ concentrations were about ۴۰% higher than in the mid-۱۹th century, with an average growth of ۲ ppm per year in the last ۱۰ years ۲ and even ۳ ppm per year since ۲۰۱۵. Among human activities producing greenhouse gases, the combustion of fuels for electricity and heat is the largest source of carbon dioxide emissions, accounting for more than ۴۲% of human CO۲ emissions, where ۴۳% and ۲۶% of these gases are respectively industrial and residential needs are allocated. Apart from energy production, direct emission of CO۲ caused by vehicle transportation (۲۳%) and industrial processes (۱۹%) are the main factors of CO۲ emission caused by human activities. In addition, global energy demand is expected to increase over the years and even double by ۲۰۵۰. As a result, the combination of the two units leads to a single linked unit, especially in the case of the reuse of heat provided by the exothermic reactions of methanol for the regeneration of the CO۲ storage solvent. An economic evaluation is proposed to estimate the operating and investment costs as well as the net present value, which shows that the economic feasibility strongly depends on the costs of electricity and H۲ production. A life cycle analysis method is finally performed to identify key environmental points. The original process design offers significant reductions in greenhouse gases (in addition to other groups) compared to conventional fossil production of natural gas.

کلیدواژه ها:

Carbon Dioxide Absorption ، Greenhouse Gases ، Industrial Processes ، Methanol Exothermal Reactions