Untersuchungen zur Löslichkeit von Schadstoffen aus Kohlekraftwerken in verflüssigtem Kohlendioxid

The present utilization of coal, mineral oil and natural gas is causing an overall increase of the carbon dioxide concentration in the atmosphere. lt has been proposed to burn fossil fuel compounds wich pure oxygen and to liquefy the carbon dioxide, which is the main component in the product stream. The liquid can be used as asolvent for the other combustion products. This report describes the solubilities and vapor-liquid equilibria of typical combustion products in liquid CO$_{2}$. The experiments are male in an equilibrium apparatus, which can measure the solubility of solid, liquid and gaseous components in CO$_{2}$ at temperatures between -40 and +15 °C and pressures up to 70 bar. Coal ash is completely insoluble in liquid carbon dioxide. The experimental results are confirmed by solution theory. The vapor-liquid equilibria of the gaseous overcritical components N$_{2}$, CO, O$_{2}$ and NO in liquid CO$_{2}$ are shown in detail. Beside the data from literature, the systems NO/CO$_{2}$ and CO/CO$_{2}$ are investigated experimentally. The solubility data of these two systems are well described by the Redlich-Kwong-Soave-Equation