Recovery of Hydrogen from Coke-Oven Gas by Forming Hydrate

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• 作者：Qiang Sun ; Jiangjie Dong ; Xuqiang Guo ; Aixian Liu ; Jingwen Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：May 2, 2012
• 年：2012
• 卷：51
• 期：17
• 页码：6205-6211
• 全文大小：322K
• 年卷期：v.51,no.17(May 2, 2012)
• ISSN：1520-5045

文摘

Coke-oven gas (COG), a byproduct of the coking process, has a relatively large fraction of hydrogen (H₂). However, most COG is combusted away directly, resulting in serious waste of resources. Taking advantage of a separation gas mixture containing H₂, we used a hydrate separation method in this work to recover H₂ from COG. The formation conditions of COG hydrate were measured in 6 mol % tetrahydrofuran (THF) solution, which could significantly reduce COG hydrate formation pressures and make it possible to realize the industrial application of the separation technology. On this basis, the separation experiments were conducted in THF solution and THF-sodium dodecyl sulfate (SDS) solution, respectively. The experimental results of two-stage separation of COG via hydrate formation were obtained, and the effects of SDS on the reaction velocity were investigated as well. The results show that after one-stage separation, the content of H₂ in residual gas can be increased from 48.41 mol % to about 65 mol %, and the recovery of H₂ ranges from 81% to 96%. After two-stage separation, the content of H₂ in residual gas ranges from 76 mol % to 84 mol %, and the recovery of H₂ is between 72% and 91%. With the presence of SDS, the hydration reaction velocity is sped up to some extent, and the induction time and reaction time of hydrate formation are greatly shortened.