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

doi:10.11949/j.issn.0438-1157.20160366

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

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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 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).

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 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

通讯作者: 刘蓓
基金资助:
国家自然科学基金项目（21276272，21522609）。

Abstract

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

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

CLC Number:

TE645

TONG Xiongshi, PAN Yong, WANG Muyu, SHI Jialiang, CHEN Guangjin, LIU Bei. Removal of CO₂ from natural gas by 2-methylimidazole/ethylene glycol system at room temperature[J]. CIESC Journal, 2016, 67(10): 4240-4245.

童雄师, 潘勇, 王慕宇, 史家亮, 陈光进, 刘蓓. 2-甲基咪唑/乙二醇体系常温脱除天然气中的二氧化碳[J]. 化工学报, 2016, 67(10): 4240-4245.

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

2-甲基咪唑/乙二醇体系常温脱除天然气中的二氧化碳

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