Can carbon dioxide be used as a nitrogen shield?
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I would like to ask, why is nitrogen used? Can it be protected with carbon dioxide? Since all require explosion-proof conditions, can carbon dioxide be used as a substitute for nitrogen for protection? How much can the operating costs differ?
Nitrogen is used for protection in many places these days; can carbon dioxide be used as a substitute? Are there any relevant regulations?
It can’t be a definite yes; if one wants to get serious about it, one should study the respective physical and chemical properties, as well as those of the medium that is to be sealed.
Nitrogen is cheap but has low reactivity. How much is carbon dioxide, and what are the risks?
I’ve learned it, but it can’t be used; carbon dioxide is definitely more dangerous than nitrogen, as it has a higher likelihood of reacting with the materials.
Nitrogen is inexpensive, easy to produce, and provides good protection; it cannot be replaced by carbon dioxide
For the first one, consider the properties of the medium; in principle, protection is possible even if there is no reaction； The second factor to consider is cost; producing high-purity nitrogen should be much cheaper than producing high-purity carbon dioxide, and the manufacturing process is also more mature, with raw materials being easier to obtain ； Thirdly, I think nitrogen has a lower density, which should also be an advantage. For reference!
What specific operating conditions are we talking about? It should be analyzed from two aspects: technical feasibility and economic viability. Carbon dioxide does not always serve as an explosion-proof agent, as it is not an inert gas; moreover, what is the concentration of carbon dioxide in air? 0.3%, right? For 78% nitrogen, the cost needs to be taken into consideration. Additionally, under high temperatures and appropriate conditions, carbon dioxide and carbon, as well as water, undergo reactions; take a look at the equations for water gas synthesis.
Carbon dioxide becomes weakly acidic when it comes into contact with water, and this can cause corrosion. Therefore, carbon dioxide cannot be used to replace nitrogen.
Consider cost, density, and the impact on the manufacturing process