As can be seen from the above two f

As can be seen from the above two figures, with the increase of methane and nitrogen content, the critical temperature and critical pressure of carbon dioxide will change. In terms of critical temperature, although the existence of nitrogen and methane will reduce the critical temperature of carbon dioxide, the impact on it is almost equal, while in terms of critical pressure, the impact of nitrogen and methane is in the direction of increasing, but the impact is different. The influence of nitrogen on the critical pressure of carbon dioxide is almost twice that of methane, so the influence of nitrogen is greater than that of methane on the whole, which is also related to the greater influence of nitrogen on pipeline transportation in the next chapter.