Selective Ti-Based Homogeneous Catalyst for Ethylene Dimerization Using New Haloethane Promoters and Electron Donor Ligands
This research deals with investigation of the effects of two haloethanes as new promoters and two electron donor compounds as suitable ligands in the presence of triethylaluminum (TEAl) as activator for ethylene dimerization to 1‐butene. We first compared effects of tetrahydropyran (THP) and 2,5-dimethoxytetrahydrofuran (2,5-DMTHF) as donor ligands on the catalyst performance in the absence of promoters. The experimental results showed that in general the performance of the catalyst system containing 2,5-DMTHF was better than that containing THP in the selected reaction conditions. Then, the effects of chloroethane (CE) and bromoethane (BE) as new promoters were examined on the Ti(OC4H9)4/TEAl/2,5-DMTHF catalyst system over a very wide promoter/Ti molar ratio. The data obtained from the relevant experiments showed that ethylene conversion, overall selectivity to 1-butene, and yield of reaction were all higher for the CE compared to BE in the aferomentioned catalyst system. The further postulations were drawn for elucidation of the suitable effect of these promoters.
KeywordsElectron donor ligand Ethylene dimerization Haloethane PE Promoter TEAl Yield
We appreciate the R&D department of Arak Petrochemical Company (ARPC) for their fruitful collaboration. Especially, S.H. Mahdaviani is very grateful to Mr. A. Saadatmand, head of the research laboratory of the R&D department of ARPC, for assistance and advice during working with set up of the 1 L büchi reactor and also would like to express his indebtedness towards Mr. A. Nassiri who is one of the staff of the R&D department of ARPC for help in performing the dimerization experiments and the characterization of polymers produced in reactions by DSC analysis as part of a fellowship awarded to him.
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