Preparation of Porous Anhydrous MgCl2 Particles by Spray Drying Process

Abstract

Abstract. Polyethylene (PE) is indispensable materials in daily lives. To produce PE, the catalyst was needed in the reaction. Ziegler-Natta catalysts were mostly used which consisted of TiCl4 on the MgCl2 supports. Polyethylene particle was reported to replicate the shape of the catalyst particles or catalyst support particles. Therefore, the MgCl2 supports need to satisfy various requirements regarding particle morphology such as shape, particle size with uniform size distribution as well as the porosity. In this research, the preparation of MgCl2 particles from irregular shape of anhydrous MgCl2 by spray drying method was studied. The moisture was reported as the poison of the catalyst, so the unusual close loop spray drying under N2 conditions was used in this study. The different types of alcohol, ethanol, n-propanol and n-butanol as solvent which was used to dissolve MgCl2 before feeding through the spray drying on the particle properties were investigated. The amount of residual alcohol (alcoholic hydroxyl group content), morphology, specific surface area, porosity and crystallinity were determined by GC method, scanning electron microscope (SEM), N2 sorption analyzer and X-ray diffraction (XRD), respectively. The results revealed that spray drying process can produce the porous anhydrous MgCl 2 particles which have rough surface, higher porosity and lower crystallinity than original anhydrous MgCl2.

Heterogeneous Ziegler–Natta catalysts with various sizes of MgCl2 crystallites: synthesis and characterization

“…This is in agreement with results described in the literature about the small reflection peak at 2θ = 15° [1,15] and the partly merged-reflection peaks at 2θ = 30° and 2θ = 35° [45][46][47].…”

An Efficient, Solvent-Free Process for Synthesizing Anhydrous MgCl2

“…The PXRD (Figure a) analysis of this sample shows that there was no formation of the Mg­(OH)Cl or any other byproduct formation. Furthermore, this dehydrated product even showed a structure similar to the activated MgCl 2 . From both XRD analysis and sample weight analysis, it is speculated that the dehydrated product is actually a fractional hydrate MgCl 2 ·nH 2 O (0 < n < 1).…”

“…Furthermore, this dehydrated product even showed a structure similar to the activated MgCl 2 . 28 From both XRD analysis and sample weight analysis, it is speculated that the dehydrated product is actually a fractional hydrate MgCl 2 •nH 2 O (0 < n < 1). This obtained material was characterized by measuring surface area using the BET (Brunauer−Emmett−Teller) method with N 2 gas at 77 K and pore size distribution analysis using the BJH (Brunauer− Joyner−Halenda) method, a typical technique that can be used for determining micro/mesoporosity in nanoporous materi-als.…”

Tuning of Ziegler Natta Catalyst using Emulsion Technique

“…Therefore ideal supports provide catalysts with high activity for the production of polyolefin. Various methods have been reported for producing support for Ziegler Natta catalyst such as ball milling [21][22][23][24][25], melt quenching [26], seeding process [27], spray drying [28][29][30][31] and emulsion [32,33,34,35].…”