Experimental Study on the Separation of CH4 and N2 via Hydrate Formation in TBAB Solution

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• 作者：Qiang Sun ; Xuqiang Guo ; Aixian Liu ; Bei Liu ; Yusheng Huo ; Guangyin Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：February 16, 2011
• 年：2011
• 卷：50
• 期：4
• 页码：2284-2288
• 全文大小：722K
• 年卷期：v.50,no.4(February 16, 2011)
• ISSN：1520-5045

文摘

In order to reduce the emission of coal bed methane mixed with air (can be regarded as a CH₄ and N₂ mixture), which will be helpful to adequately utilize the natural resources and protect environment, the separation of CH₄ and N₂ via hydrate formation in tetra-n-butylammonium bromide (TBAB) solution was systematically studied in this work. The CH₄鈭扤₂ hydrate formation conditions were determined in TBAB solution first, and then the separation experiments were carried out in TBAB and TBAB鈭抯odium dodecyl sulfate (SDS) solution, respectively. The experimental results show that CH₄ and N₂ form a hydrate much easier after adding TBAB to water. The composition of CH₄ in the hydrate after single-stage equilibrium separation in TBAB solution can be increased from 46.25 mol % to 67.86 mol %. At the same conditions, the composition of CH₄ after separation in TBAB鈭扴DS solution is 68.66 mol % and the reaction time shortens greatly. Besides, the recovery of CH₄ is more than 47%, and the gas storage capacity of hydrate is 19鈭?1 m³/m³. Higher composition and recovery of CH₄ are expected to be obtained if multistage separation is applied. It indicates that CH₄ can be concentrated effectively from CH₄ and N₂ via hydrate formation in TBAB solution. Since the hydrate separation technology can substantially avoid the explosion problem caused by CH₄ and on the basis of the results obtained in this work, we may say that this technology is quite suitable for the separation of coal bed methane mixed with air and has broad prospects for industrial applications.