Synergistic effects of water and methanol mixed solvents on the liquefaction of Northeastern Indian coals: Insights from product analysis

IF 4.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
Govind Dubey, Prabu Vairakannu, Pankaj Tiwari
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Abstract

The study explored the synergistic effect of methanol as a co-solvent during the hydrothermal liquefaction of three coals from Northeastern India: Bokolia (AB), Bapung (MB), and Margherita (MG). Lignite and sub-bituminous grade coals were tested at reaction temperatures ranging from 350–400 ℃ and 30–60 min residence times, using varying ratios of methanol and water. The products included gas, oil, asphaltenes, preasphaltenes, and char. The best results were achieved with AB coal at 375 ℃ for 60 min with a water-to-methanol ratio of 1:1, yielding 41.7 wt% conversion and 13.8 wt% oil (d.a.f basis). Synergistic effects enhanced oil yield, with maximum values of 53.8 % for AB, 15.9 % for MB, and 23.6 % for MG at optimal conditions. Notably, CO in gaseous products was present in higher concentrations (5–16 vol%) across all coal types at 375 ℃, while MG oil was found to be primarily paraffinic.
水和甲醇混合溶剂对东北印度煤液化的协同效应:来自产品分析的见解
研究了甲醇作为助溶剂在印度东北部三种煤的水热液化过程中的协同作用:Bokolia (AB)、Bapung (MB)和Margherita (MG)。褐煤和亚烟煤在反应温度350-400℃和30-60 min停留时间范围内,使用不同比例的甲醇和水进行测试。产品包括天然气、石油、沥青质、预沥青质和焦炭。以AB煤为原料,在375℃、60 min、水甲醇比为1:1的条件下,转化率为41.7 wt%,油收率为13.8 wt%。协同效应提高了油收率,在最佳条件下,AB、MB和MG的收率分别达到53.8% %、15.9% %和23.6% %的最大值。值得注意的是,在375℃时,所有煤类型的气态产物中CO的浓度都较高(5-16 vol%),而MG油主要是石蜡。
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来源期刊
Journal of Supercritical Fluids
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.
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