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I would like to ask how to remove trace fluorides and chlorides from CO2 gas

2019-10-28View Original

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Dear colleagues, I have a question: We need to use CO2 gas in our production process, but traces of fluorides and chlorides have been detected in this gas (mainly organic fluorines and vinyl chloride). This not only affects subsequent processes but also causes corrosion of the equipment. So I would like to ask everyone how we can effectively remove trace amounts of organic fluorine and vinyl chloride from CO2, while minimizing CO2 loss as much as possible The process conditions are as follows: the CO2 content in the gas is >99%, the contents of organic fluorines and vinyl chloride are both around 10 ppm, with the remainder being various VOC-type impurity gases. The gas is supplied continuously, with a flow rate of approximately 25,000 m3/h, a pressure of 2–3 MPa, and a temperature at room level. The process requirements are as follows: the CO2 loss should be ≤5%, the removal efficiency of organic fluorines and vinyl chloride should be ≥90%, and the process should be as simple and straightforward as possible. Now, considering the use of solid adsorption methods, it is not easy to find adsorbents that can effectively adsorb organic fluorines and vinyl chloride while adsorbing very little CO2. If temperature- or pressure-swelling adsorption is used, there is concern that the desired treatment effect may not be achieved. I was wondering if anyone has any good suggestions? Or is there any company or research institution in China that possesses such technology? I hope you will kindly offer your advice. Thank you all!
Reply #22019-10-28
The multi-stage membrane separation process developed by Evonik could be considered
Reply #32019-10-28
Okay, thank you. I wasn’t familiar with this process before; I’ll consult Evonik about it. :handshake
Reply #42019-10-29
You can consult an activated carbon manufacturer
Reply #52019-10-29
Find research institutes such as Komei Institute, and reach an agreement on cooperation to collect some gases for them to use in experiments and develop plans

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