Solid Formation during Composite-Ionic-Liquid-Catalyzed Isobutane Alkylation
2014; American Chemical Society; Volume: 28; Issue: 8 Linguagem: Inglês
10.1021/ef500684r
ISSN1520-5029
AutoresHao Ma, Rui Zhang, Xianghai Meng, Zhichang Liu, Haiyan Liu, Chunming Xu, Rentan Chen, Peter A. A. Klusener, Jan de With,
Tópico(s)Carbon dioxide utilization in catalysis
ResumoComposite ionic liquid (CIL) prepared from triethylamine hydrochloride, anhydrous aluminum(III) chloride, and cuprous chloride is a new catalyst for isobutane alkylation. This composite ionic liquid alkylation (CILA) technology yields an alkylate with favorable product distribution. CILA is a promising replacement for sulfuric acid and hydrofluoric acid alkylation technologies. However, some solids are formed during alkylation, and solid amount increases with time on stream. In a number of separation steps, the used CIL was divided into liquid and solid. Nuclear magnetic resonance, X-ray diffraction, X-ray photoelectron spectroscopy, and elemental analyses were applied to characterize these fractions. The content of acid-soluble oil (ASO) in solid was also investigated. The results showed that the solid was mainly cuprous chloride and contained about 1 wt % ASO. The loss of aluminum chloride and detachment of CuCl as a form of solid from CIL resulted in the decrease of CIL acidity and product selectivity.
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