Method for determining the kinetics of cracking and coking of shale oil vapours in fluidized beds
Method for determining the kinetics of cracking and coking of shale oil vapours in fluidized beds
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DOI：
10.1016/0016-2361(92)90214-9
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发表时间：
1992-12
期刊：
影响因子：
7.4
通讯作者：
S. Carter;D. Taulbee
中科院分区：
文献类型：
--
作者：
S. Carter;D. Taulbee
油页岩干馏产生的油蒸气的二次裂化和焦化先前已被证明取决于发生这些反应的基质的性质和温度。为了真实地检查流化床干馏过程中这些反应的动力学，已经开发了一种装置，该装置允许在一个流化床中产生的页岩油蒸气通过第二个流化床中的选定基质。基材可以批量或连续供给。在批量模式中，基材被加热至反应温度，然后暴露于页岩油蒸气一段选定的时间。通过燃烧热解产物并使用在线质谱仪测量燃烧的氧化物来实时监测固体上的碳沉积。碳吸收的程度也可以通过反应后底物的元素分析来确定。这两种分析方法在所有研究条件下都表现出良好的一致性。在连续模式中，可以收集大量的产物油，因此可以评估裂化的影响。已测量了加工页岩和纯矿物上的碳沉积率。
The secondary cracking and coking of oil vapours produced from oil shale retorting have been previously shown to depend upon the nature and temperature of the substrate over which these reactions occur. To realistically examine the kinetics of these reactions during fluidized bed retorting, an apparatus has been developed which permits shale oil vapours generated in one fluidized bed to pass over selected substrates in a second fluidized bed. Substrates can be fed as a batch or continuously. In the batch mode, the substrate is heated to reaction temperature and is then exposed to shale oil vapours for a chosen period of time. Carbon deposition onto the solid is monitored in real-time by combusting the pyrolysis products and measuring the oxides of combustion with an on-line mass spectrometer. The extent of carbon uptake is also determined by elemental analysis of the substrate following reaction. These two methods of analysis were shown to correspond well under all the conditions investigated. In the continuous mode, substantial amounts of product oil can be collected so the effects of cracking may be evaluated. The rates of carbon deposition onto processed shales and pure minerals have been measured.