midterm+2+08 - Chemical Engineering 140 Midterm...

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n H2O,W n K2CO3, s n CO2,e n CO3--,e n HCO3-,e n H2O,e n H+,e n K+,e n CO2,r n H2O,r n CO3--,o n HCO3-,o n H2O,o n H+,o n K+,o Flash drum R E O n N2,n Absorber CO 2( g ) + H 2 O ( l ) K C 1 ←→  H ( aq ) + + HCO 3( aq ) - H ( aq ) + + CO 3( aq ) -- K C 2 ←→  HCO 3( aq ) - S W N Chemical Engineering 140 October 24, 2008 Midterm Examination #2 (140) Carbon Dioxide Sequestration Using Aqueous Potassium Carbonate Both John McCain and Barack Obama have released statements expressing their support for “clean coal” technology. A major initiative in the development of clean coal power plants is carbon sequestration—minimizing the release into the atmosphere of carbon dioxide (CO 2 ) produced from the complete combustion of coal. You have been hired by our next president to evaluate the feasibility of potential carbon sequestration processes. As illustrated in Figure 1, one process proposed for carbon sequestration involves absorption of carbon dioxide into aqueous potassium carbonate (K 2 CO 3 ), a soluble solid powder formerly used as food additive. A mixture of carbon dioxide and nitrogen gas is bubbled though a stream of aqueous potassium carbonate in an absorber, producing potassium bicarbonate (KHCO 3 ) and hydronium ions (H
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midterm+2+08 - Chemical Engineering 140 Midterm...

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