Temperature-staged catalytic coal liquefaction
Temperature-staged catalytic coal liquefaction
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DOI：
10.1016/0016-2361(86)90235-8
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发表时间：
1986-09
期刊：
影响因子：
7.4
通讯作者：
F. Derbyshire;A. Davis;M. Epstein;P. Stansberry
中科院分区：
文献类型：
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作者：
F. Derbyshire;A. Davis;M. Epstein;P. Stansberry
本文研究了在分散硫化钼催化剂存在下，烟煤和次烟煤在连续升温的条件下的液化反应。已发现该顺序不仅导致高的煤转化率，而且以沥青质为代价大大增加液化产物对油的选择性。这些收益是在轻烃气体产量略有增加的情况下取得的。虽然还没有系统的尝试，以确定液化行为后的反应参数的具体影响，初步结果表明，有很大的潜力，通过在两个阶段中的溶剂和反应条件的适当选择，进一步改善。从加氢和缩合反应平衡的角度讨论了温度分级液化有效的原因。通过光学显微镜检查液化残留物提供了强有力的支持证据，表明分阶段的反应顺序有利于氢化过程。此外，显微镜检查已被证明是一种强有力的诊断技术，例如，表明第一阶段的温度应低于烟煤的次烟煤，并提供洞察催化液化过程。
An investigation has been made of the liquefaction of a bituminous and a subbituminous coal under conditions where reaction is conducted in successive stages of increasing temperature and in the presence of a dispersed sulphided Mo catalyst. This sequence has been found to lead not only to high coal conversion but to greatly increase the selectivity of the liquefied products to oils at the expense of asphaltenes. These gains are made with marginal increases in the production of light hydrocarbon gases. Although no systematic attempt has yet been made to determine the specific influence of reaction parameters upon liquefaction behaviour, preliminary results show that there is substantial potential for further improvement through the suitable choice of solvent and reaction conditions in the two stages. The reasons for the effectiveness of temperature staged liquefaction are discussed in terms of the balance between hydrogenation and condensation reactions. Examination of the liquefaction residues by optical microscopy has provided strong supporting evidence to show that the staged reaction sequence favours hydrogenative processes. Moreover, the microscopic examination has proved to be a powerful diagnostic technique, showing, for example, that the first stage temperature should be lower for the subbituminous than the bituminous coal, and providing insight into the processes of catalysed liquefaction.