费托合成油加氢生产马达燃料工艺技术研究

Study on Preparation Process of Motor Fuel From Fischer-Tropsch Synthetic Oil by Hydrocracking

针对费托合成油特殊的组成结构开发了加氢裂化生产清洁交通运输燃料的专用催化剂,催化剂采用特殊改性的裂化组分和新制备方法,使分子筛和加氢金属在催化剂中分布更均匀,提高加氢裂化催化剂的异构性能,在获得较高中间馏分油收率的同时,大幅度改善柴油的低温性能。工艺研究结果表明:采用单程一次通过生产中间馏分油时,转化率不宜超过50%,转化率的提高会导致中油选择性的降低,同时影响柴油十六烷值;采用尾油循环的工艺流程时,中间馏分油收率大幅提高,可以达到70%(m)以上,是多产中间馏分油较为适宜的工艺流程。

According to the special composition of Fischer-Tropsch synthetic oil as raw material,special catalyst for the hydrocracking of Fischer-Tropsch synthetic oil to produce clean motor fuel was developed.Special cracking components and new methods have been used to prepare the catalyst,so hydrogenation components are distributed uniformly.The catalyst has suitable cracking activity and strong isomerization performance.Moreover,the high yield of middle distillate oil can be obtained and the low temperature performance of diesel oil can be improved.The results show that the cetane number of product and the selectivity of the catalyst for middle distillate oil decrease gradually with the increasing of conversion.For this reason,the conversion should not exceed 50%.And the tail oil circulation process is demonstrated to be an appropriate technological process which can dramatically increase the yield of middle distillate oil by more than 70%.