将2-甲基咪唑溶于乙二醇中形成混合溶液体系，利用该体系常温下实现对天然气中二氧化碳的脱除。首先分别测定单组分甲烷和二氧化碳在体系中的吸收容量，在0.1 MPa下，CO2在2-甲基咪唑/乙二醇混合溶液中溶解度约为0.87 mol·L−1，高于同等条件下CO2在大部分离子液体中的溶解度，二氧化碳的吸收容量远大于甲烷的；然后对混合气CH4/CO2进行分离，发现该体系能较好吸收分离CH4/CO2。最后考察了体系的再生性和重复利用性，得出2-甲基咪唑/乙二醇溶液体系能完全再生并且能重复使用。%A binary liquid mixture system of 2-methylimidazole and ethylene glycol was used to remove carbon dioxide (CO2)from natural gas at room temperature. The measurement on absorption capacity of methane (CH4) and CO2 in this system shows the CO2solubility about 0.87 mol·L−1 at 0.1 MPa, which is higher than that in most ionic liquids under the same condition, and the absorption capacity of CO2 was greater than that of CH4. Further experimental results demonstrate that the liquid mixture could effectively separate CO2/CH4 gas mixture and could be regenerated and reused. After several cycles of absorption/desorption operations, the absorption capability was found barely changed, indicating good stability and application prospective of this binary system.
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