化工学报 ›› 2016, Vol. 67 ›› Issue (10): 4240-4245.DOI: 10.11949/j.issn.0438-1157.20160366

• 分离工程 • 上一篇    下一篇

2-甲基咪唑/乙二醇体系常温脱除天然气中的二氧化碳

童雄师1, 潘勇1, 王慕宇2, 史家亮1, 陈光进1, 刘蓓1   

  1. 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
  • 收稿日期:2016-03-29 修回日期:2016-06-28 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: 刘蓓
  • 基金资助:

    国家自然科学基金项目(21276272,21522609)。

Removal of CO2 from natural gas by 2-methylimidazole/ethylene glycol system at room temperature

TONG Xiongshi1, PAN Yong1, WANG Muyu2, SHI Jialiang1, CHEN Guangjin1, LIU Bei1   

  1. 1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2 Petro-China Co. Ltd. Dalian Petrochemical Co., Dalian 116011, Liaoning, China
  • Received:2016-03-29 Revised:2016-06-28 Online:2016-10-05 Published:2016-10-05
  • Supported by:

    supported by the National Natural Science Foundation of China (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,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。

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

Abstract:

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 CO2 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 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.

Key words: methane, carbon dioxide, ethylene glycol, 2-methylimidazole, absorption, separation, natural gas purification

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