Chemical Processes and Use of CO2

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Chemical Processes and Use of CO2 ( chemical-processes-and-use-co2 )

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Dimethyl carbonate (DMC) can be produced from methanol and CO2 with high yields. Dimethyl ether (DME) can also be produced directly from H2 and CO2. While methanol is typically synthesised from syngas, a mixture of carbon monoxide and hydrogen, it can also be generated from the reaction of car- bon dioxide and hydrogen (see Equation (z)): CO + 2 H2 → CH3OH or CO2 + 3 H2 → CH3OH + H2O (z) The world’s largest Power-to Methanol plant has been built by Carbon Recy- cling International in Iceland. The plant consumes around 5500 metric tons of CO2 each year in the methanol production process. The plant is powered using electricity from hydrothermal or geothermal sources in Iceland. Elec- tricity is used to generate H2, which is then converted catalytically with CO2 to produce methanol. The CO2 feedstock is captured from the flue gases of a geothermal facility located on the same site as the power-to-methanol plant. 1.1.2.2.2.3 Formic acid The hydrogenation of carbon dioxide leads initially to the formation of formic acid (HCO2H). Formic acid is an industrial chemical that is used for neutralising alkaline reaction mixtures, as a preservative in the food indus- try, for tanning in the leather industry, and for bonding polyamide in the plastics industry. There is also the possibility of generating hydrogen from formic acid for use in fuel cells. Small-scale demonstration plants with an annual production capacity of up to 350 kg of formic acid that use CO2 as a chemical feed-stock have already been tested successfully. Mention should also be made of the ‘Energy-efficient Electrochemistry in Microreactor 2.0’ project that is being coordinated by the University of Stuttgart. The goal of this applied research project is to develop an energy-efficient electrochemi- cal process for manufacturing formic acid from CO2 emission sources. Elec- trochemical conversion of CO2 into formic acid will take place in microreac- tors and by making use of renewable energy sources, such as photovoltaic or wind power, the process can function as an energy storage system. There are plans to evaluate the technology at a later date in order to determine how much CO2 can be converted and whether or not the process represents an economically viable option for industrial companies. 1.1.2.2.2.4 Inorganic carbonates (minerals/construction materials) The construction industry is an another area offering a number of promising opportunities for using CO2 as a raw material. Through its reaction with sili- cates and mineral oxides, CO2 can be incorporated in inorganic carbonates, which can be used, for example, in construction materials like cement, which is the binder used in concrete. This type of CO2 utilisation represents One goal for the future is to construct an entire building with a negative carbon foot-print by using cement from mineralised waste and CO2 captured from industrial sources. MOTIVATION, CHALLENGES, OUTLOOK 27

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