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Analysis of long term catalytic performance for isobutane alkylation catalyzed by NMA–AlCl_3 based ionic liquid analog

Pengcheng Hu  Zhitao Wu  Junlin Wang  Yuqing Huang  Yang Deng  Shufeng Zhou  
【摘要】:Isobutane alkylation with 2-butene to produce high-quality gasoline was catalyzed by Nmethylacetamide(NMA)-AlCl_3 based ionic liquid(IL) analog with a NMA/AlCl3 molar ratio of 0.75 and CuCl modification,which was marked as CuCl-modified 0.75 NMA-1.0 AlCl_3.The long-term experiment was carried out in the autoclave operated in continuous mode to investigate the distribution of alkylate under different experimental nodes.The result indicated that the long-term alkylation was divided into three stages:rising,stable,and descending regions.C8 selectivity and molar ratio of trimethylpentanes(TMPs) to dimethylhexanes(DMHs) reached the highest level in the stable region,and research octane number(RON) of alkylate was as high as 97.Anionic Al species([AlbCl_7]~-,[A1 CuC15]-) and cationic Al species([AlCl_2 L]~+) from IL analog as two active Lewis acidic species played a catalytic role in the long-term alkylation,whereas the neutral Al species did not participate into the alkylation.Moreover,the structure of CuCl-modified 0.75 NMA-1.0 AlCl_3 was destroyed after the deactivation,and CuCl was enriched in the CD_2 Cl_2-insoluble substance,resulting in a decreasing TMP/DMH ratio.The catalytic lifetime of IL analog was similar with CuCl-modified 0.55 Et_3 NHCl-1.0 AlCl_3 IL,but IL analog had a lower cost.

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