Abstract There is continuing interest in in situ production of oil from oil shale, particularly for deep deposits and for environmental reasons. Such production would involve long-time, low temperature pyrolysis. Accordingly, reactions of El-Lajjun oil shale have been carried out under N2 for 7, 14 and 28 days at temperatures in the range 240–320 °C. The conversion plateaued at 300 °C and above at a value of about 80 wt% dmmf and was the same for 7 and 14 day pyrolysis. The total conversion decreased by 15% as the temperature decreased to 280 °C. The lower conversions at 240 and 260 °C were the same for 14 and 28 days but oil yield increased at the expense of asphaltene for the longer time. Sulfur content of the oil + asphaltene decreased with increasing reaction temperature (240–300 °C) and time (280–300 °C) from 13 wt% to a plateau of about 7 wt%. The characteristics of the oil and oil + asphaltene changed steadily with temperature up to 300 °C, but increasing the temperature further to 320 °C had little effect. The results show that high conversion to products of good characteristics can be obtained for reactions at sufficiently long times at temperatures as low as 300 °C.

中文翻译：

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El-Lajjun 油页岩长时间低温热解

摘要 人们对从油页岩中原位生产石油一直很感兴趣，特别是对于深层矿床和出于环境原因。这种生产将涉及长时间的低温热解。因此，El-Lajjun 油页岩的反应已在 N2 下在 240-320 °C 的温度范围内进行了 7、14 和 28 天。转化率在 300 °C 及以上达到稳定，约为 80 wt% dmmf 的值，并且对于 7 天和 14 天的热解是相同的。随着温度降低到 280 °C，总转化率下降了 15%。240 和 260 °C 下的较低转化率在 14 天和 28 天相同，但石油产量增加，但沥青质在较长时间内增加。油 + 沥青质的硫含量随着反应温度 (240–300 °C) 和时间 (280–300 °C) 的增加而降低，从 13 wt% 降至约 7 wt% 的稳定水平。油和油+沥青质的特性随着温度升高到300°C而稳定变化，但进一步提高温度到320°C影响不大。结果表明，在低至 300 °C 的温度下，在足够长的时间内反应可以获得高转化率，转化为具有良好特性的产物。