Improvement of quality fuels has gained traction as a result of growing demand for higher quality fuels because of health concern, environmental issues and tighter emission control by regulatory bodies. Low quality, unprocessed fuels produce household air pollution on burning that can be fatal. In this work, Kenaf and palm kernel adsorbents were used in pressure swing adsorption to enrich methane from stranded natural gas containing extraordinarily high carbon dioxide content of 70 vol%. Microporous palm kernel activated carbon from this work was found effective in methane enrichment process to produce better quality fuel that met the gas pipeline quality standard. Methane with 85.0% purity and 94.2% recovery was achieved at 1 minute of adsorption time due to the methane flow‐through and effective carbon dioxide retention. Increased adsorption time of higher than 1 minute resulted in the reduction of both purity and recovery of the gases due to the delayed cross‐over of methane. Methane compression at three bars consumed 10.0 kJ/min out of 33.0 kJ/min. Methane expansion released 8.0 and 2.0 kJ/min from methane and carbon dioxide rich stream, respectively during blowdown. The total entropy change from the compression and expansion of the gas was nil, suggesting that the process induced no disorder to the surrounding. Pressure swing adsorption with equalization mode reduced the methane purity to 76% and carbon dioxide recovery to 70% but increased the methane recovery to almost 100% and carbon dioxide purity to 97% in a criss‐cross procession.

中文翻译：

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PSA与无定形红麻和微孔棕榈仁壳吸附剂的均压作用对滞留天然气中甲烷富集的影响

由于对健康的关注，环境问题以及监管机构对排放量的严格控制，对高质量燃料的需求不断增长，从而提高了质量燃料的吸引力。低质量，未经处理的燃料在燃烧时会产生家庭空气污染，这可能是致命的。在这项工作中，红麻和棕榈仁吸附剂被用于变压吸附中，以从含70％（体积）超高二氧化碳含量的滞留天然气中富集甲烷。发现这项工作中的微孔棕榈仁活性炭可有效地富集甲烷，以生产出符合天然气管道质量标准的更高质量的燃料。由于甲烷流过并有效保留了二氧化碳，因此在吸附时间1分钟内，甲烷的纯度达到85.0％，回收率达到94.2％。超过1分钟的增加的吸附时间会导致甲烷纯度的降低，从而降低纯度和气体回收率。在3个压力下，甲烷压缩消耗33.0 kJ / min中的10.0 kJ / min。在排污期间，甲烷膨胀分别从富含甲烷和二氧化碳的气流中释放8.0和2.0 kJ / min。气体压缩和膨胀引起的总熵变化为零，表明该过程不会对周围环境造成混乱。采用均压模式的变压吸附将甲烷纯度降低至76％，将二氧化碳回收率降低至70％，但在纵横交错的过程中，将甲烷回收率提高至近100％，二氧化碳纯度提高至97％。