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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when they enter the absorber column. The regenerated (i.e. CO2-lean) solvent enters at the head of the absorber column with a temperature of about 40 °C. On the downward path to the base of the column, the concentration gradient drives the CO2 from the gas phase into the liquid phase. As the CO2 is absor- bed by the solvent, most of the heat released by absorption is taken up by the solvent stream, whose temperature increases to about 70–80 °C depending on the enthalpy of absorption and the extent of CO2 loading in the binary (amine-water) solution. At the base of the absorber tower, the CO2-rich sol- vent has a temperature of around 55 ± 5 °C. The temperature profile within the absorber tower is shown in Figure 84. The horizontal bars indicate the degree of absorption occurring within each vertical segment of the column. In order to mitigate the pronounced temperature rise in the central part of the column and thus make the absorption mass transport process mo- re uniform across the height the tower, one or more intercooling units are incorporated (see Fig. 82). Fig. 83: Factors used in designing and optimising the CO2 capture process CARBON CAPTURE Basic data • Reynolds numbers • Froude numbers • Hydraulic surface • Real Holdup Thermodynamic data • Enthalpy of reaction • Heat capacity • Henry Solubility Kinetic data • Diffusion gas boundary liquid • reaction rate constants Plant-specific data 193

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