How to capture carbon dioxide?
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A certain gas contains 90% carbon dioxide and 10% oxygen, with a temperature of 100 degrees and a pressure of 1 atm.； The traffic is very high. What is the appropriate way to separate them? What is the final outlet temperature of the nitrogen from oxygen production reflux?
Absorption is the most suitable method; it is best to carry out absorption under pressure, as this will **reduce** the circulation volume of the solution
For pressure swing adsorption or cryogenic methods, please contact us for detailed design
Reply to 3# longkui1990: Please post more meaningful posts so we can all communicate together. Thank you
Under this pressure, absorption and separation are still carried out using a solution； If pressurization is applied, liquefaction separation can be considered.
Reply to 6# maningyuanhuag: If it’s liquefied, compression is required – isn’t the energy consumption too high? Where does the cold energy come from then? I’m sorry, I don’t even know how to calculate exposure levels. Could you teach me?……
If compression is required, it indeed consumes a lot of energy, but the carbon dioxide obtained through cryogenic separation should be in liquid form, and the purity of gaseous oxygen is also high, allowing it to be recycled. It would be best to analyze the phase diagram; this saturation temperature is likely not sufficient to meet the requirements of cryogenic conditions (below -100 degrees). I think it’s necessary to consider the advantages and disadvantages of various approaches in a comprehensive manner, taking into account factors such as the product requirements – whether gas or liquid is needed – and how to maximize profits. The product contains a high amount of carbon dioxide; when recycled, the liquid form is more suitable for delivery. Is there a large market for this? It is better to then compare the differences in separation methods and energy consumption.
Cryogenic treatment seems suitable; the carbon dioxide content is quite high, so absorption, regeneration, or adsorption are not appropriate options
Reply to 3# xxqm: Are cryogenic treatment and low-temperature distillation the same thing? Is the energy consumption very high? Where does the cooling capacity come from? How cold does it need to be……
Deep cryogenics is different from low-temperature distillation; you can look up some information on it