氮气吹扫和费托合成的脉冲过程以提高α-烯烃的选择性（英文）  

Enhanced formation of α-olefins by the pulse process between Fischer-Tropsch synthesis and N_2 purging

作　　者：石和祥[1,2] 李志凯[1] 刘克峰 肖海成 孔繁华 张娟[1] 陈建刚[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049 [3]中国石油天然气有限公司石油化工研究院,北京100029

出　　处：《燃料化学学报》2016年第7期822-829,共8页Journal of Fuel Chemistry and Technology

基　　金：supported by the National Natural Science Foundation of China(21373254,21503256);PetroChina(PRIKY14006,PRIKY15038,PRIKY15039,PRIKY15042)

摘　　要：费托合成可以将煤炭或者生物质气化得到的合成气转化为α-烯烃等重要的化工产品。研究将费托合成和氮气吹扫操作组合成一脉冲过程,在稳定的操作状态下保证费托合成和氮气吹扫交替进行。在传统的费托合成条件下(反应气速为2 000 h^(-1),温度为497 K,压力为2.0 MPa,氢碳体积比为2.0)考察了Fe-Co催化剂在脉冲过程中费托合成的活性和选择性。结果表明,N_2吹扫温度和压力分别为517 K和0.2 MPa下的费托合成的C_3烯烷比是未脉冲的相同反应条件下的九倍左右。同时,反应过程中CH_4的选择性和CO的转化率有所下降。在此基础上,通过间歇反应在固定床反应器中进行该脉冲过程,实验结果表明,利用脉冲操作在费托反应中可以获得更高的烯烃选择性。The Fischer-Tropsch synthesis has offered an alternative way to convert coal and biomass into chemicals such as α-olefins via sygas comprised of H2 and CO. A pulse process switching between Fischer-Tropsch synthesis and N2 purging was carried out when the Fischer-Tropsch synthesis became stable in the fixed bed reactor. The activity and selectivity over Fe-Co catalyst for α-olefins in Fischer-Tropsch synthesis reaction were measured under the normal conditions of 2.0 MPa,497 K,2 000 h^-1 and H2 /CO volume ratio of 2.0. It was found that the olefin to paraffin ratio of C3 for Fe-Co catalyst purged at 517 K and 0.2 MPa was almost nine times higher than that of the fresh one without purging under the same reaction conditions,and the CH4 selectivity and CO conversion decreased after purging. Two possible reasons were proposed to explain these phenomena. Moreover,a batch experiment by the pulse process in fixed bed reactor was performed. Notably,a high olefins yield was obtained via the pulse process during the Fischer-Tropsch synthesis.

关 键 词：Α-烯烃 脉冲过程 氮气吹扫 费托合成 

分 类 号：TQ529.2[化学工程—煤化学工程]