Ethylene/1-Hexene Copolymerization with Modified Ziegler-Natta Catalyst

Yin, Meng; Zhang, Zhiqiang; Xiong, Yan; Zhang, Yan; Mi, Puke

doi:10.1007/s40242-019-9114-5

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…These variations on catalytic activity and molecular weight brought by the introduction of 1-octene were coincided with "comonomer effect" in Ziegler-Natta catalytic system and metallocene catalysts. 48 Furthermore, the content of 1-octene in the copolymer increased gradually and reached 6.4% at 2.0 mol L À1 .…”

Section: Entrymentioning

confidence: 95%

Synthesis of ultrahigh-molecular-weight ethylene/1-octene copolymers with salalen titanium(iv) complexes activated by methyaluminoxane

et al. 2022

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Section: Entrymentioning

confidence: 95%

Synthesis of ultrahigh-molecular-weight ethylene/1-octene copolymers with salalen titanium(iv) complexes activated by methyaluminoxane

et al. 2022

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“…Longer chained, linear olefins such as n-hexane, n-heptane and n-octane show higher reactivities compared to their respective alkanes. Therefore, these molecules are utilizable as comonomers in polyethylene syntheses [3][4][5] or for further functionalization to acetals, alcohols and aldehydes, [6][7] which are ingredients in perfumes, pharmaceuticals and agricultural chemicals. [7][8] In dehydrogenation of long-chain alkanes, catalysts often suffer from fast deactivation.…”

Section: Introductionmentioning

confidence: 99%

A Highly Stable Bimetallic Transition Metal Phosphide Catalyst for Selective Dehydrogenation of n‐Heptane

et al. 2022

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In this work, we demonstrate RuP 2 -MoP catalysts being highly stable and selective for the dehydrogenation of long-chain alkanes like n-heptane. Compared to a monometallic MoP catalyst, the bimetallic system substantially increases n-heptene selectivity from 40 % towards 80 %. This effect can be traced back to a reduced surface acidity, suppressing the competitive hydrogenolysis reaction. The active transition metal phosphide is, furthermore, compared to its phosphorous-free RuMocounterpart. As revealed by STEM-EDX investigations, incorporation of phosphorous results in the formation of separated metal phosphide clusters instead of an intermetallic alloy. In the dehydrogenation of n-heptane the phosphorous modification clearly avoids catalyst deactivation and maintains the high nheptene selectivity. X-ray diffraction, elemental analysis and STEM-EDX further reveal that catalyst coking and the formation of less active molybdenum carbide phases is effectively suppressed by phosphorous incorporation, making RuP 2 -MoP an attractive system for selective dehydrogenation of long-chain alkanes.

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“…The main substitution of its catalyst precursor is transition metal (titanium, vanadium or chromium). One important thing in industrial seriously concern is how to control polymer morphology because it affects the mechanical properties of polymer and transportation in process rule [9]. The support is preferred to improve morphology of polymer and protect fouling in the reactor.…”

Section: Introduction 11 General Introductionmentioning

confidence: 99%

Effect of cocatalyst combination in titanium-based ziegler-natta catalyst on olefin polymerization

Pongchan¹

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This research focused on effect of cocatalyst types (TEA, TnOA, and TEA+TnOA) on titanium-based Ziegler-Natta catalyst in olefin polymerization both in slurry and gas-phase systems. This study has been divided into four sections. The commercial titanium-based catalyst was selected to investigate effect of reaction temperature and oxidation state of titanium from ESR measurement on slurry ethylene and propylene polymerization in the first and the second parts, respectively. The commercial catalyst with TEA exhibited the highest activity in ethylene polymerization. However, divalent, and trivalent of titanium (Ti2+ and Ti3+) was active in ethylene polymerization to produce more polymer. Stability of Ti3+ was demonstrated to assist insertion of 1-hexene. Hence, propylene polymerization under different reaction temperatures was conducted to evaluate the titanium oxidation state (Ti3+). The ESR results revealed that TEA+TnOA at 50oC can stabilize titanium (III) state. Regarding to the third and fourth parts, different magnesium sources supported-catalyst; MgCl2 (Cat A), MgO (Cat B), and Mg(OEt)2 (Cat C); were compared in gas-phase ethylene polymerization. The modification of supported catalyst could improve the performance of catalyst and polymer. The results presented that Cat C or Mg(OEt)2 reacting with TEA showed the highest catalytic activity for both homo- and co-polymerization of ethylene. The addition of 1-hexene as comonomer could improve the activity and higher comonomer response called as “comonomer effect”. Moreover, the polymer obtained in gas-phase process exhibited remarkably better morphology than in slurry process.

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Ethylene/1-Hexene Copolymerization with Modified Ziegler-Natta Catalyst

Cited by 5 publications

References 29 publications

Synthesis of ultrahigh-molecular-weight ethylene/1-octene copolymers with salalen titanium(iv) complexes activated by methyaluminoxane

Synthesis of ultrahigh-molecular-weight ethylene/1-octene copolymers with salalen titanium(iv) complexes activated by methyaluminoxane

A Highly Stable Bimetallic Transition Metal Phosphide Catalyst for Selective Dehydrogenation of n‐Heptane

Effect of cocatalyst combination in titanium-based ziegler-natta catalyst on olefin polymerization

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