Propene polymerization with Mg(OEt)₂‐supported TiCl₄ catalyst, 1. Catalyst composition and behavior

Abstract

SUMMARTCatalysts obtained from TiCl , and ball-milled Mg(OEt), in the presence of a halide compound (dichloroethane, chlorobenzene or dichlorobenzene) and/or an internal donor (ethyl benzoate or diisobutyl phthalate) were prepared for propene polymerization. The composition of the catalysts was analyzed by IR, GC, atomic absorption spectroscopy and titration. The exchange reaction between the ethoxy group of the support and the chloride group of TiCI, was found to depend profoundly on the halide compound and/or the internal donor used. The propene polymerizations were carried out using various Mg(OEt),-supported catalysts and triethylaluminium as cocatalyst with or without external donor (triethoxyphenylsilane). The catalyst activity and stereospecificity were examined. on the Mg(OR),-supported titanium catalysts for olefin polymerization '). This paper reports on the effects of the chemical composition of Mg(OEt),supported TiCl, catalysts on the activity and specificity for the synthesis of isotactic polypropylene. The effects of Lewis bases') on the present catalysts were also examined. Experimental partMuteriuk Propene (purity >%J,5%) (from Korea Petrochemical Ind. Co.) was used without further purification. Nitrogen of an extra pure grade (99,999010) was dried by passing it through the molecular sieve 3A column, and harane was passed through the molecular sieve 4A column.CCC 0025-1 16X/90/$03.00

Investigation of Planar Ziegler-Natta Model Catalysts Using Attenuated Total Reflection Infrared Spectroscopy

“…The C=O band of the TiCl 4 /DIBP complex has shifted further downward, generating a peak splitting in the region 1,640-1,581 cm -1 . Comparable results have been reported previously [21,22]. The TiCl 4 /DIBP complex formation resulted in a yellowish solid product.…”

“…IR spectroscopy has been extensively applied to Ziegler-Natta catalysts [17]. With regard to propylene polymerization catalysts, most of the work has focused on the spectral changes in the m C=O of the internal aromatic ester in various stages of catalyst preparation [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Propylene polymerization by using TiCl4 catalyst supported on solvent‐activated Mg(OEt)2

“…Polymerization was started by adding the catalyst to the reactor and performed at 50°C for 2 h. The polymerization was terminated by addition of a dilute solution of hydrochloric acid in ethanol. The precipitated polymers were filtered out, washed with plenty of ethanol, and dried under vacuum at 60°C for 8 h. The isotactic index6, 10, 12 of the obtained polymers was determined by extraction with boiling heptane for 6 h.…”

“…Recently, we studied in detail the preparation, chemical composition, and characterization of Mg(OEt) 2 ‐supported TiCl 4 catalysts for the synthesis of isotactic polypropylene 6–12. However, these catalysts still have problems concerning morphology control of catalysts, such as particle size, particle size distribution, and particle shape.…”

A stacked neural network approach for yield prediction of propylene polymerization

“…There are only a few records reporting a comprehensive review on the effect of operational parameters on polymerization of propylene to get suitable productivity and isotacticity index (I.I.%);10–13 therefore, a thorough study on the effect of operational parameters on the mentioned systems would be useful. According to the fact that process modeling is proved to be successful in many facets of process engineering and it can be utilized to reach predictive purposes, modeling of such a system would be valuable.…”