Enhancement of biogenic methane production from coal using supercritical CO2

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2023-10-01 DOI:10.1016/j.supflu.2023.106023

Xiao Feng , Zizhong Zhang , Hongguang Guo , Zhigang Li , Zaixing Huang , Michael Urynowicz

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引用次数: 0

Abstract

Supercritical CO₂ (ScCO₂) extraction could improve the bioavailability of coal for the enhancement of biogenic methane production. Here, the influence of prolonged ScCO₂ extraction on methane yield was investigated since in-situ ScCO₂ injection is time-consuming. The results showed that the enhancement of biomethane production from coal was negatively correlated with extraction time and extraction yield. With the extension of ScCO₂ extraction time from 0.5 day to 28 days, the methane yield of extracted coals increased by 20.1∼111.4% than that of raw coal. ScCO₂ mainly reacted with the organic structures on the surface of coal (such as the C-O and CH₂-CO), rarely the skeleton structure. In the prolonged extraction, aromatics were first extracted, then oxygen-containing matters and aliphatics which reduces the methane production of extracted coal but increases the methane generation potential of extractable organic matter. Then, a conceptual model of ScCO₂-MECBM was proposed for enhancing methane recovery in-situ.

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利用超临界CO2提高煤生物甲烷产率

超临界CO2萃取可以提高煤的生物利用度，提高生物甲烷的产量。在这里，研究了延长ScCO2提取对甲烷产量的影响，因为原位注入ScCO2是耗时的。结果表明，煤中生物甲烷产量的提高与提取时间和提取率呈负相关。随着ScCO2提取时间从0.5天延长到28天，提取煤的甲烷产率比原煤提高了20.1～111.4%。ScCO2主要与煤表面的有机结构（如C-O和CH2-CO）反应，很少与骨架结构反应。在长期提取中，首先提取芳烃，然后提取含氧物质和脂族化合物，这降低了提取煤的甲烷产量，但增加了可提取有机物的甲烷生成潜力。然后，提出了一个提高甲烷原位回收率的ScCO2-MECBM概念模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.