2-甲基咪唑/乙二醇体系常温脱除天然气中的二氧化碳  

Removal of CO_2 from natural gas by 2-methylimidazole/ethylene glycol system at room temperature

作　　者：童雄师 潘勇[1] 王慕宇 史家亮[1] 陈光进[1] 刘蓓[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249 [2]中国石油大连石化公司,辽宁大连116011

出　　处：《化工学报》2016年第10期4240-4245,共6页CIESC Journal

基　　金：国家自然科学基金项目(21276272;21522609)~~

摘　　要：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,CO_2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CO_2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CH_4/CO_2进行分离,发现该体系能较好吸收分离CH_4/CO_2。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（CO_2） from natural gas at room temperature. The measurement on absorption capacity of methane（CH4） and CO_2 in this system shows the CO_2 solubility 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 CO_2 was greater than that of CH4. Further experimental results demonstrate that the liquid mixture could effectively separate CO_2/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.

关 键 词：甲烷 二氧化碳 乙二醇 2-甲基咪唑 吸收 分离 天然气净化 

分 类 号：TE645[石油与天然气工程—油气加工工程]