费托蜡热裂解制线性α-烯烃工艺研究

Cracking of F-T refined wax for producing linear α-olefin

以煤制油工艺费托精制蜡为原料,在固定床反应器上进行了热裂解制线性α-烯烃(LAO)的实验,考察了原料组成、裂解温度、停留时间、水蜡比及循环工艺对转化率及裂解产物分布的影响,优化了工艺条件。结果表明,裂解温度及停留时间对原料转化率及LAO收率有显著影响,循环工艺可进一步提高LAO收率。过高的裂解温度或过长的停留时间均会导致生成的LAO的二次反应,对反应不利。在适合的工艺条件下可获得53%的LAO收率。

The steam cracking of Fischer-Tropsch refined wax from the coal-to-oil process for producing linear α-olefin(LAO) was carried out on a fixed bed reactor. The effects of feedstock composition, cracking temperature,contact time, water-to-wax ratio and cyclic process on the feed conversion and products distribution were investigated and optimized. The factors such as cracking temperature and contact time have significant influence on conversion and LAO yield, and cyclic process can further improve the LAO yield. However, excess high cracking temperature and longer contact time result in the second reactions, which are unfavorable for the LAO production.Under the suitable process conditions 53% of LAO yield are obtained.