Optimization of Effective Parameters on 1-Hexene Production from Ethylene Using Chromium/tris 2-Ethylhexanoate Catalyst

Document Type : Research Article

Authors

1 Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, I.R. IRAN

2 Department of Chemistry, University of Zanjan, Zanjan, I.R. IRAN

Abstract

Linear alpha-olefins are one of the most important products of the petrochemical industry, which are widely used in the preparation of detergents, lubricants, plasticizers and also as co-monomer in the production of Linear Low-Density PolyEthylene (LLDPE). Ethylene oligomerization, especially ethylene trimerization (1-hexene production), is one of the most important methods used to produce these high-consumption materials, in which different catalysts are used in the presence of ethylene gas. In this regard, ethylene trimerization catalyst based on four-component system {2,5-dimethylpyrrole (DMP)/Cr(III)/Triethyl Aluminum (TEA)/hexachloroethane (HCE)} was prepared with high purity and the prepared catalyst was characterized using different analysis such as FT-IR, UV-Visible, CHNS, and ICP. The effect of ethylene pressure, the molar ratio of Al/Cr, ligand and solvent types and different injection methods on activity and selectivity was studied. Also, with increasing the ethylene pressure, the productivity of 1-hexane increased. The use of hexachloroethane as an accelerator in the presence of n-heptane aliphatic solvent increased the yield of the catalyst. The best way to perform the trimerization reaction was the production of dual catalyst-ligand and cocatalyst-hexachloroethane solutions separately and adding them to the reactor. Ethylene trimerization using this catalytic system at 27 °C, 90 °C, normal heptane solvent and Al/Cr ratio of 40 resulted in selective production of 1-hexene with a yield of 193850 (g L-C6/g Cr.h) and selectivity of 91.8 percent.

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References

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