Titanium-Magnesium Catalysts for Propylene Polymerization: The Effect of Donors Full article
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Catalysis in Industry
ISSN: 2070-0504 , E-ISSN: 2070-0555 |
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| Output data | Year: 2011, Volume: 3, Number: 2, Pages: 103-108 Pages count : 6 DOI: 10.1134/S2070050411020024 | ||
| Tags | Chain transfer with hydrogen, Molar mass of polypropylene, Propylene polymerization, Supported Ziegler-Natta catalysts, Ti-Mg catalysts with electron donors | ||
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Abstract:
The chain transfer reaction with hydrogen at propylene polymerization over Ti-Mg catalysts (TMCs) of composition TiCl4/D1/MgCl2-AlEt3/D2 is studied in a wide hydrogen concentration range. A two-step mechanism of this reaction is suggested. This mechanism accounts for the fractional order of the reaction with respect to hydrogen concentration. Constants of chain transfer reaction with hydrogen are determined for TMC with different donors: 1,3-diether or dibutyl phthalate as D1 and tetraethoxysilane or dicyclopentyldimethoxysilane as D2. In propylene polymerization over the TMCs, the length of the polymer chain is mainly determined by the ratio of the propylene and hydrogen concentrations because the propagation and chain transfer rate constants are comparable. The rate constant of chain transfer with hydrogen at ethylene polymerization is significantly (more than one order of magnitude) less, and higher hydrogen concentrations are required for attaining the same degree of polymerization. The results of this study might be helpful in simulation of industrial polymerization processes and in control of the polymer molar mass.
Cite:
Bukatov G.D.
, Sergeev S.A.
, Zakharov V.A.
, Echevskaya L.G.
, Matsko M.A.
Titanium-Magnesium Catalysts for Propylene Polymerization: The Effect of Donors
Catalysis in Industry. 2011. V.3. N2. P.103-108. DOI: 10.1134/S2070050411020024 WOS Scopus РИНЦ OpenAlex
Titanium-Magnesium Catalysts for Propylene Polymerization: The Effect of Donors
Catalysis in Industry. 2011. V.3. N2. P.103-108. DOI: 10.1134/S2070050411020024 WOS Scopus РИНЦ OpenAlex
Original:
Букатов Г.Д.
, Сергеев С.А.
, Захаров В.А.
, Ечевская Л.Г.
, Мацько М.А.
Ti-Mg-катализаторы полимеризации пропилена: эффект доноров
Катализ в промышленности. 2011. №1. С.14-19. РИНЦ ANCAN
Ti-Mg-катализаторы полимеризации пропилена: эффект доноров
Катализ в промышленности. 2011. №1. С.14-19. РИНЦ ANCAN
Dates:
| Submitted: | Nov 29, 2010 |
| Published print: | Jun 1, 2011 |
| Published online: | Jul 19, 2011 |
Identifiers:
| Web of science: | WOS:000433659100001 |
| Scopus: | 2-s2.0-80755142675 |
| Elibrary: | 18012731 |
| OpenAlex: | W2127980731 |