Morphological study of spherical MgCl₂.nEtOH supported TiCl₄ Ziegler‐Natta catalyst for polymerization of ethylene

Abstract

Spherical MgCl 2 ⅐nEtOH was prepared by adducting ethanol to MgCl 2 using melt quenching method. Effect of molar ratio of [EtOH]/[MgCl 2 ] ϭ 2.8 -3.05 on the morphology and particle size of the MgCl 2 ⅐nEtOH were studied. The best adduct of spherical morphology was obtained when 2.9 mol ethanol to 1 mol MgCl 2 was used. An emulsion of dissolved MgCl 2 in ethanol was prepared in a reactor containing silicon oil. Stirrer speed of the emulsion and its transfer rate to quenching section that work at Ϫ10 to Ϫ40°C are affected by the particle size of the adduct particle. The adducted ethanol was partially removed with controlled heat primary to catalyst preparation (support). Treatment of the support with excess TiCl 4 increased its surface area from 13.1 to 184.4 m 2 /g. Heterogeneous Ziegler-Natta catalyst system of MgCl 2 (spherical)/TiCl 4 was prepared using the spherical support. Scanning electron microscopy studies of adduct, support, and catalyst obtained shown spherical particles, however, the polyethylene particles obtained have no regular morphology. The behavior indicates harsh conditions used for catalyst preparation, prepolymerization, and polymerization method used.

Characteristics of linear/branched polyethylene reactor blends synthesized by metallocene/late transitional metal hybrid catalysts

“…The support used in this work was prepared by treating an adduct MgCl 2 ÁnEtOH with TIBA in heptane [19]. Details of the experimental procedure for producing MgCl 2 ÁnEtOH (adduct) can be found elsewhere [40]. The hybrid catalysts were prepared as follows: (30 mmol) TIBA was added to 1-g support (dispersed in 20 mL toluene) at room temperature along with gentle mechanical stirring and after 1 h was washed three times each time with 20 mL toluene, and finally the solid powder was dried.…”

Preparation of ultra high molecular weight amorphous poly(1-hexene) by a Ziegler-Natta catalyst

“…[23] To optimize the alcohol content in adduct, it was heated to 120°C. The support (5 g) was added to a catalyst preparation reactor containing n-heptane (100 ml).…”

Immobilization of Titanium Tetrachloride on Mixed Support of MgCl2 · xEB/Poly(methyl acrylate-co-1-octene): Catalyst for Synthesis of Broad MWD Polyethylene

“…WAXD data and micrographs are indicative of MgCl 2 layers as reported in earlier studies [7]. The organic support, poly(methyl acrylate-co-1-octene) (PMO) was synthesized through ARGET ATRP as this methodology provides uniformity in comonomer distribution leading to uniform dispersion of titanium onto the matrix [10]. The number average molecular weight (M n ) of the synthesized copolymer was 12000 with polydispersity index (PDI) of 1.4 and 1-octene content in copolymer was 25 mol %.…”