Oligomerization of ethylene in the presence of heterogenized complex catalytic systems based on ionic liquid‐type substituted zirconium phenolates

• Published in: Applied organometallic chemistry 2017-09, Vol.31 (9), p.n/a
• Main Authors: Khamiyev, M.J., Azizov, A.H., Khanmetov, A.A., Alieva, R.V.
• Format: Article
• Language: English
• Subjects: Alkenes; Alkylaluminium; Catalysts; Chemical synthesis; Chemistry; Decantation; Ethylene; heterogenization; Ionic liquids; Ions; olefins; Oligomerization; Selectivity; Zirconium; zirconium phenolates
• ISSN: 0268-2605; 1099-0739
• DOI: 10.1002/aoc.3692

The oligomerization of ethylene was investigated in the presence of novel catalytic systems consisting of alkylaluminium chlorides and heterogenized zirconium phenolates containing amino and imino hydrochloride substituents. It was determined that the composition of a synthesized oligomer and the activity or selectivity of the catalyst systems depend on various parameters such as the molar ratio of Zr:Al, the composition of alkylaluminium, the temperature of the reaction, the pressure of ethylene and the structure of zirconium phenolates. The results showed that C4‐C10 linear α‐olefins were obtained with high selectivity when diethylaluminium chloride was used as a co‐catalyst. The process of the separation of a synthesized oligomer from the catalyst containing amino and imino hydrochloride ionic liquid substituents was carried out by simple decantation, and after this process zirconium complexes could be reused several times for successive ethylene oligomerizations. Oligomerization processes of the ethylene carried out in the presence of MC1, MC2, MC3 and MC4 Zr ‐ complexes containing various amino and imino hydrochloride ligands. These complexes show high catalytic activity for obtaining C4 – C12 linear α – olefins and olefinic product can be easily separated from catalyst. The distribution of olefins depend on Zr‐complexes, Zr:Al molar ratio, reaction temperature and pressure of ethylene.