能源化学(英文) ›› 2013, Vol. 22 ›› Issue (1): 39-47.

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Hydrate capture CO2 from shifted synthesis gas, flue gas and sour natural gas or biogas

Yanhong Wang, Xuemei Lang, Shuanshi Fan*   

  1. School of Chemistry and Chemical Engineering, Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South China

    University of Technology, Guangzhou 510640, Guangdong, China

  • 收稿日期:2012-12-24 出版日期:2013-01-20 发布日期:2013-02-06
  • 通讯作者: 樊栓狮

Hydrate capture CO2 from shifted synthesis gas, flue gas and sour natural gas or biogas

Yanhong Wang, Xuemei Lang, Shuanshi Fan*   

  1. School of Chemistry and Chemical Engineering, Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South China

    University of Technology, Guangzhou 510640, Guangdong, China

  • Received:2012-12-24 Online:2013-01-20 Published:2013-02-06

摘要: CO2 capture by hydrate formation is a novel gas separation technology, by which CO2 is selectively engaged in the cages of hydrate and is separated with other gases, based on the differences of phase equilibrium for CO2 and other gases. However, rigorous temperature and pressure, high energy cost and industrialized hydration separator dragged the development of the hydrate based CO2 capture. In this paper, the key problems in CO2 capture from the different sources such as shifted synthesis gas, flue gas and sour natural gas or biogas were analyzed. For shifted synthesis gas and flue gas, its high energy consumption is the barrier, and for the sour natural gas or biogas (CO2/CH4 system), the bottleneck is how to enhance the selectivity of CO2 hydration. For these gases, scale-up is the main difficulty. Also, this paper explored the possibility of separating different gases by selective hydrate formation and reviewed the progress of CO2 separation from shifted synthesis gas, flue gas and sour natural gas or biogas.

关键词: clathrate hydrate, CO2 capture, hydrogen, shifted synthesis gas, flue gas, sour natural gas or biogas

Abstract: CO2 capture by hydrate formation is a novel gas separation technology, by which CO2 is selectively engaged in the cages of hydrate and is separated with other gases, based on the differences of phase equilibrium for CO2 and other gases. However, rigorous temperature and pressure, high energy cost and industrialized hydration separator dragged the development of the hydrate based CO2 capture. In this paper, the key problems in CO2 capture from the different sources such as shifted synthesis gas, flue gas and sour natural gas or biogas were analyzed. For shifted synthesis gas and flue gas, its high energy consumption is the barrier, and for the sour natural gas or biogas (CO2/CH4 system), the bottleneck is how to enhance the selectivity of CO2 hydration. For these gases, scale-up is the main difficulty. Also, this paper explored the possibility of separating different gases by selective hydrate formation and reviewed the progress of CO2 separation from shifted synthesis gas, flue gas and sour natural gas or biogas.

Key words: clathrate hydrate, CO2 capture, hydrogen, shifted synthesis gas, flue gas, sour natural gas or biogas