Experiment on the Separation of Air-Mixed Coal Bed Methane in THF Solution by Hydrate Formation

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• 作者：Qiang Sun ; Xuqiang Guo ; Aixian Liu ; Jin Dong ; Bei Liu ; Jingwen Zhang ; Guangjin Chen
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：July 19, 2012
• 年：2012
• 卷：26
• 期：7
• 页码：4507-4513
• 全文大小：383K
• 年卷期：v.26,no.7(July 19, 2012)
• ISSN：1520-5029

文摘

Because of the technology limitation and safety requirement, a large amount of air-mixed coal bed methane is released directly to the atmosphere. It leads to severe waste of resources and exacerbates the greenhouse effect. This work tries to alleviate this problem by separating CH₄ from a mixture of CH₄ and N₂ via hydrate separation method. Several experiments were systematically carried out in 6 mol % tetrahydrofuran (THF) solution to separate CH₄/N₂ gas mixtures containing 4.90 to 71.23 mol % CH₄. The results that THF can significantly reduce the formation pressure of CH₄鈥揘₂ hydrate materialize the possibility of separating CH₄ and N₂ using hydrate separation technology in industrial scale. CH₄ can be separated effectively from CH₄/N₂ mixture and concentrated in hydrate phase with the presence of THF. The recovery of CH₄ ranges from 34.06% to 58.16% and the separation factor is between 2.29 and 5.17. A two-stage separation process of 46.28 mol % CH₄/53.72 mol % N₂ with recycle is designed to increase the recovery of CH₄. The calculated results indicate that CH₄ concentration in hydrate gas could reach 82.61 mol % with a recovery yield of 47.28%. Hydrate separation technology is an effective way to process and utilize the air-mixed coal bed methane. Multistage separation process does have wide application prospects.