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Issue
Korean Journal of Chemical Engineering,
Vol.14, No.5, 390-393, 1997
Temperature Programmed Decomposition of Silica-Supported MgCl2/THF/TiCl4 Catalyst and Effect of Thermal Treatment on Ethylene Polymerization Rate
Ko YS, Han TK, Woo SI
Silica supported MgCl2/THF/TiCl4 catalyst (SiO2/MgCl2/THF/TiCl4) was prepared, and then decomposed thermally. The amount of produced gas [tetrahydrofuran (THF) and 1,4-dichlorobutane (DCB)] was measured with gas chromatography (GC) and mass spectrometer. SiO2/MgCl2/THF/TiCl4 catalyst started to decompose around 85℃, and further decomposed at 113, 10 and 213℃. THF was mainly produced, but very small amount of DCB evolved during temperature programmed decomposition (TPD), while unsupported MgCl2/THF/TiCl4 produced DCB significantly. Polymerization rate of ethylene with SiO2/MgCl2/THF/TiCl4 decreased when it was preheated at 85 and 110℃ for 5 and 60 min, respectively, while that of unsupported MgCl2/THF/TiCl4 increased after same pretreatment condition. It can be suggested that Mg/Ti bimetallic complex anchored on the surface of silica through OH group of it has weak interaction between Mg and Ti species.
Keywords: Olefin Polymerization; Ziegler-Natta Catalyst; Thermal Treatment
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