从CO_2含量很高的天然气中分离甲烷一直是一项技术难题,一些天然气储集层中CO_2的含量高达90%。由于CO_2不但没有热量价值,其酸性还会腐蚀天然气处理设备,所以必须从CH_4中除去。现在常用的CO_2和CH_4的分离方法都是以化学吸/脱附为基础的,这些方法在CH_4含量大于CO_2时能够得到比较理想的处理结果,可是如果用于CO_2含量较高的天然 Separation of methane from natural gas with high CO 2 content has been a technical challenge, with some CO_2 in natural gas reservoirs reaching up to 90%. Since CO 2 not only has no calorific value, its acidity will also corrode the natural gas processing equipment, so it must be removed from CH 4. At present, common separation methods of CO 2 and CH 4 are based on chemisorption / desorption. These methods can obtain ideal treatment results when the CH 4 content is greater than CO 2. However, if the method is used for natural