ORGANOCHROM-PHENOXY IMINE SYNTHESIS AS CATALYST FOR ETHYLENE TRIMERIZATION REACTION

• Main Author: FAUZIAH (NIM :10510039) ; Pembimbing Dr. Eng. Yessi Permana, RATIH
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19234
• Institution: Institut Teknologi Bandung

1-Hexene is a linear α-olefin and used primarily as comonomer for HDPE production. Ethylene trimerization is one of methods to produce 1-hexene. The reaction is carried out using an organometallic complex as catalyst. Most reported catalysts used in ethylene trimerization are activated by MAO (methylaluminoxane) as catalyst activator which are employed in excess amount of MAO (molar ratio of catalyst/ MAO up to 1:10.000). This research attemps to synthesize a catalyst which is efficient and selective for 1-hexene formation without using MAO as activator. Based on its plausible reaction mechanism, a catalyst must be designed to ease the oxidative addition and β- hydrogen elimination process. With such consideration, Cr was choosen as a metal center with phenoxy-imine based ligands. Aluminium alkoxy was used replace MAO by generating alkoxy phenoxy imine complex. LigandS were synthesized using Schlenk methods and so were the catalysts. Phenoxy-imine ligands should have a good rigidity to control the amount of coordinating ethylene and must have strong σ donor character to ease the oxidative addition process. Chrom was choosen because it possessed electrophilic character to ease the reductive elimination process. Ligands was characterized by FT-IR (ʋ C=N : 1610-1630 cm-1), NMR, and Single Crystal XRD. Activation of alkoxy phenoxy imine chrom during the ethylene coordination was conducted by addition of H2 as a reducing agent. The product was characterized by GC (Gas Chromatoghraphy) and observed at retention time of 4.5 min (at a given GC condition).