取典型的甲烷和氮气含量2%与5%进行二氧化碳的相包络曲线分析，纯二氧化

取典型的甲烷和氮气含量2%与5%进行二氧化碳的相包络曲线分析，纯二氧化碳的 P-T曲线为一条，但是当有杂质进入时，其相包络曲线会扩大，出现明显的两相区，而且在相同的摩尔含量条件下氮气对两相区的扩大程度要大于甲烷的，因此氮气对其的影响更大。

Taking typical methane and nitrogen content of 2% and 5% for phase envelope curve analysis of carbon dioxide, the P-T curve of pure carbon dioxide is one. However, when impurities enter, the phase envelope curve will expand and obvious two-phase zones will appear. Moreover, under the same molar content conditions, nitrogen gas will expand the two-phase zone more than methane, so nitrogen has a greater impact on it.

Taking the typical methane and nitrogen content of 2% and 5% for the phase envelope curve analysis of carbon dioxide, the P-T curve of pure carbon dioxide is one, but when impurities enter, its phase envelope curve will expand and obvious two-phase region will appear, and the expansion degree of nitrogen to the two-phase region is greater than that of methane under the same molar content, so nitrogen has a greater influence on it.