采用ILs催化剂降低FCC汽油烯烃含量

Decreasing the Olefin Content of FCC Gasoline Using ILs Catalyst

讨论了汽油安定性的影响因素和降低汽油中烯烃的含量的途径,提出了用ILs降低FCC汽油中烯烃和碱性氮含量的新途径并进行了汽油脱氮、精制、ILs降烯烃的连续小试试验。结果表明,FCC汽油经脱氮、精制后,几乎不含碱性氮,硫含量也有明显降低,催化剂寿命延长;FCC汽油经负载ILs催化剂装柱降烯烃之后,其烯烃含量降低幅度较大、辛烷值稍有提高;同时,采用加入缓冲剂的方法以提高离子液体的催化性能,延长离子液体的寿命。作为一种对环境友好的新型催化剂,离子液体可以取代许多烷基化催化剂来降低汽油烯烃含量,并在试验中显现出反应条件温和、时间短、操作简单、易分离的优势。

The factors influencing the stability of gasoline and the methods for decreasing the olefin contents in gasoline were described. A novel way to decrease the olefin and basic nitrogen content in gasoline using ionic liquids was studied herein, as well as the investigation of decreasing the basic nitrogen content,refining, using supported ILs catalyst on a small scale. After denitrifying and refining, the basic nitrogen content of gasoline decreased nearly to null, the sulfur content also decreased greatly, and the catalyst lasted longer. After the reaction to decrease the olefin with the ILs catalyst, the FCC gasoline has the lower contents of the olefins and meanwhile its octane number increases a little. To improve the catalysis of ILs and prolong the life span of ILs, a buffering agent was added into ILs system. The ILs kind of catalyst, as a green environment-friendly catalyst, can displace many other alkylation catalysts to decrease the olefin content of gasoline, and shows the notable advantages: mild reaction conditions, short reaction time, simple operation, and easy separation of the products and the catalyst.