MDEA absorbs carbon dioxide~
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This post was last edited by 276957697 on 2012-2-27 at 10:50. Hello everyone, I would like to ask about the method for calculating the number of trays in an absorption tower used to absorb carbon dioxide from natural gas; it would be great if you could provide an example~
Pure MDEA does not react directly with CO2, but its aqueous solution does.
Currently, simulation is being carried out using KEMDEA, but no progress has been made. It seems to be a case of reactive distillation, and convergence is difficult; even when convergence is achieved, the results differ significantly from reality. This is because, in principle, MDEA alone absorbs CO2 very slowly. In practice, activators are used, and ASPEN does not provide data on the hydrolysis of these activators. PROII seems to allow for adjustment of the overall kinetic coefficients to match reality, while it’s unclear how to set them in ASPEN.
Here’s a brief update on the progress: The KEMDEA model was chosen. It was determined based on practical considerations whether it was necessary to include a Henry’s component, and the number of tower plates was decided upon. For the reaction within the tower, the KEMDEA-CO2 model was selected; the liquid holdup per tower plate was also determined. An estimated value for the tower temperature was entered, but the result showed trace amounts of CO2, which does not correspond to reality. Adjustments had to be made by using the Murphy efficiency factor for the tower plates.
Does the original poster have the calculation process? We are working on a course project and need it urgently. If they do have it, could they share it?