从上面两个图可以看出，随着甲烷和氮气含量的增加，二氧化碳的临界温度和临

从上面两个图可以看出，随着甲烷和氮气含量的增加，二氧化碳的临界温度和临界 压力都会发生变化，临界温度方面：虽然氮气和甲烷的存在都会降低二氧化碳的临界温度，但是对其影响的幅度几乎相等，而在临界压力方面，氮气和甲烷对其影响都是向着 增大的方向，但是影响的幅度有所不同，氮气对二氧化碳临界压力的影响几乎为甲烷影 响的2倍，因此从总体出发，氮气对其的影响要大于甲烷的，这也和下一章中氮气对管 道输送影响更大有关。

From the above two figures, it can be seen that as the content of methane and nitrogen increases, the critical temperature and critical pressure of carbon dioxide will change. In terms of critical temperature, although the presence of nitrogen and methane will reduce the critical temperature of carbon dioxide, the magnitude of their impact is almost equal. In terms of critical pressure, the impact of nitrogen and methane on it is in the direction of increasing, but the magnitude of their impact is different, The impact of nitrogen on the critical pressure of carbon dioxide is almost twice that of methane, so overall, nitrogen has a greater impact on it than methane, which is also related to the greater impact of nitrogen on pipeline transportation in the next chapter.

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.