摘要
费托合成油的硫、氮和芳烃含量很低,是新一代清洁油品的优选。采用Pt/ZSM-12催化剂,以费托合成馏分油为原料,在固定床加氢中试装置上进行加氢异构实验,考察了反应温度的影响,并对反应产物的性质及利用方案进行了研究。结果表明,随反应温度增加,柴油馏分的收率、凝固点和冷滤点均逐渐降低;结合反应生成油全馏分的组成分析可知,较高的反应温度有利于裂化反应和异构反应的进行,但反应温度过高时,对裂化反应的促进作用更明显。反应生成油中柴油馏分的十六烷指数很高、密度很低,可作为高十六烷值的车用柴油调合组分;在较高的反应温度下,轻柴油馏分段可生产替代航煤燃料,重柴油馏分仍可作为高十六烷值的车用柴油调合组分。
Fischer-Tropsch synthetic oils have low levels of sulfur, nitrogen and aromatics and are preferred for a new generation of ultraclean oils. In a hydrogenation pilot unit, the hydroisomerization of Fischer-Tropsch synthetic diesel oil over Pt/ZSM-12 catalyst under medium-pressure conditions was carried out in order to investigate the effect of temperature on the hydroisomerization and hydrocracking reaction during the process. Meanwhile, the main physical properties of the products were determined to explore their potential utilization as fuels. It was found that the yield as well as the freezing point and the cold filter plugging point of the diesel fractions in the products decreased with increasing temperature. The result including the composition of the whole fraction in the products indicated that the higher temperature was favorable for the hydroisomerization and hydrocracking reaction. However, when the temperature was too high, the promoting effect for the hydrocracking reaction was more obvious. The diesel fractions in the products were characterized by extremely high cetane index and low density compared to conventional diesel, justifying their application as the blending component of automotive diesel oil for increasing the cetane index.When the temperature was relatively high, the light diesel fraction of the product could meet the demands of the alternative jet fuel,while the heavy diesel fraction can also be used as the blending component of automotive diesel oil for increasing the cetane index.
引文
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