MgCl2 / 2 - Ethyl hexanol / Phthalic anhydride / Di - isobutyl phthalate / TiCl4 촉매에 의한 프로필렌 중합 특성 연구A Study on Propylene Polymerization over MgCl2 / 2 - Ethyl Hexanol / Phthalic Anhydride / Di - isobutyl Phthalate / TiCl4 Catalysts

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The highly active and stereospecific MgCl2-supported catalysts, MPDT(MgCl2/EH/PA/TiCl4/DIBP) was prepared by precipitation method from MgCl2 solution containing MgCl2, 2-ethyl hexanol(EH), and phthalic anhydride(PA). Propylene polymerizations were carried out in a slurry reactor under atmos-pheric pressure using the MPDT catalyst cocatalyzed with TEA(triethylaluminum) in the absence of phenyl triethoxy silane(PTES) and in the presence of PTES as external electron donor(EED) to study the effect of TEA and PTES concentration on the activity and stereospecificity. The effect of polymerization temperature on the isotactic index(I.I.) and the activity was studied. The influence of the hydrogen addition on the I.I. and the molecular weight was also observed. In the absence of PTES, maximum average polymerization rate(Rp, max) was obtained at the mole ration of TEA/Ti of 25. Rp, max was, however, obtained at the TEA/Ti ratin of 50 in the presence of PTES. Isotacticity decreased as the TEA/Ti molar ratio is increased in the absence of PTES. In contrast, I.I. was higher than 96% in the presence of PTES in spite of increasing the TEA/Ti molar ratio. The increase of temperature above 50℃ decreased the isotactic index as well sa the activity. The addition of hydrogen enhanced the activity and decreased the isotactic index(I.I.) of the polypropylene to a small extent. MPT(MgCl2/EH/PA/TiCl4) catalyst without DIBP slightly increased isotactic index in the presence of PTES. The characteristics of MDT(MgCl2/EH/TiCl4/DIBP) catalyst without PA were also compared with those of MPDT catalyst.
Publisher
한국화학공학회
Issue Date
1993
Language
Korean
Citation

KOREAN CHEMICAL ENGINEERING RESEARCH(HWAHAK KONGHAK), v.31, no.3, pp.361 - 368

ISSN
0304-128X
URI
http://hdl.handle.net/10203/250761
Appears in Collection
CBE-Journal Papers(저널논문)
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