费-托合成轻馏分油催化裂化反应性能的研究

STUDY ON THE CATALYTIC CRACKING PERFORMANCE OF LIGHT DISTILLATE FROM FISCHER-TROPSCH SYNTHESIS

在小型同定流化床催化裂化试验装置上考察反应温度、剂油质量比和质量空速等操作条件对费-托合成轻馏分油催化裂化反应性能的影响。结果表明:在费-托合成轻馏分油反应过程中,随着反应温度的升高、剂油质量比的增大、质量空速的降低,产物中干气、液化气和焦炭的产率增加,汽油、柴油的产率降低;随着反应温度、剂油质量比、质量空速的降低,汽油馏分中烯烃质量分数增加;随着反应温度的降低、剂油质量比和质量空速的提高,汽油馏分中异构烷烃的质量分数增加;高反应温度、高剂油质量比有利于汽油馏分中芳烃的生成,而且芳烃主要来自于小分子烯烃的环化脱氢反应;降低质量空速主要促进了汽油中大分子烷基芳烃的断侧链反应,对氢转移反应的影响不明显。

The effects of operation parameters,such as reaction temperature, weight hourly space velocity （WHSV） and catalyst to oil ratio （CTO） on the catalytic cracking of light distillate from Fischer-Tropsch synthesis were investigated using a laboratory fixed fluidized bed reactor. Test results indicated that with the increase of reaction temperature,CTO and the decrease of WHSV,the yields of dry gas, LPG and coke increased,and the yields of gasoline and diesel fuel decreased. The olefin content in gaso-line fraction increased with the decrease of reaction temperature,CTO and WHSV. As the reaction temperature decreased, CTO and WHSV increased, the isoparaffin content in gasoline fraction increased. High reaction temperature and high CTO were in favor of the formation of aromatics in gasoline fraction,and the aromatics were mainly from the cyclization and dehydrogenation of small olefin mole-cules. When WHSV was low, the side chain cracking reactions of big alkyl aromatic molecules were promoted, yet without significant effect on hydrogen transfer reaction.