Kinetic and morphological study of a magnesium ethoxide‐based Ziegler–Natta catalyst for propylene polymerization

Dashti, Ali; Ramazani, Ahmad; Hiraoka, Yuichi; Kim, Sang Yull; Taniike, Toshiaki; Terano, Minoru

doi:10.1002/pi.2490

Cited by 42 publications

(43 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12 We have also proposed that the spatial distribution of Ti species inside catalyst particles was strongly dependent on the synthetic procedure to diverse kinetic profiles and morphology developments among differently prepared ZN catalysts. 13 In summary, three factors (the over-reduction and aggregation of Ti species, and the disintegration of catalyst particles) are believed to collaborate in polymerization with MgCl 2 -supported ZN catalysts in order to give a specific decay curve of monomer consumption. It is essential to study these three factors individually for investigating the deactivation behavior of the ZN catalysts.…”

Section: Introductionmentioning

confidence: 99%

Role of dispersion state of ti species in deactivation of MgCl2-supported Ziegler-Natta catalysts

et al. 2010

Self Cite

View full text Add to dashboard Cite

The deactivation behaviors of TiCl 3 /MgCl 2 model catalysts with molecularly dispersed TiCl 3 were investigated to clarify the role of the dispersion state of the Ti species in the deactivation of MgCl 2 -supported ZieglerNatta (ZN) catalysts for propylene and ethylene polymerization. The propylene and ethylene polymerization activities of clustered Ti species supported on MgCl 2 were approximately one tenth of those of isolated Ti species, which is indicative of the significance of the aggregation of Ti species in the deactivation of ZN catalysts for olefin polymerization. Moreover, the time-course depression of monomer consumption for the clustered Ti species was slower than that for the isolated Ti species in propylene polymerization, whereas the dispersion state barely affected the depression rate in ethylene polymerization. The reduction rate of the Ti species was concluded to be important for the time-course depression of propylene consumption, whereas ethylene polymerization was insensitive to the oxidation state of the Ti species.

show abstract

Section: Introductionmentioning

confidence: 99%

Role of dispersion state of ti species in deactivation of MgCl2-supported Ziegler-Natta catalysts

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…A TiCl 4 /DBP/MgCl 2 catalyst (Cat‐C), which is the most widely used in the present industry, was also prepared from spherical Mg(OEt) 2 precursor based on literature . 80 mL of TiCl 4 was dropwisely added to 40 g of Mg(OEt) 2 in 240 mL of toluene.…”

Section: Methodsmentioning

confidence: 99%

Origin of Chemical Composition of Ethylene/Propylene Copolymer Produced with Ziegler–Natta Catalyst

Takahashi

Wada

Chammingkwan

et al. 2016

Macro Reaction Engineering

Self Cite

View full text Add to dashboard Cite

The origin of the chemical composition of ethylene/propylene copolymer produced with Ziegler–Natta catalysts is investigated in terms of the active site nature and transient monomer concentration during polymerization. Using various catalysts including TiCl3/MgCl2 model catalysts with controlled Ti dispersion and TiCl4/internal donor/MgCl2 traditional catalysts, normal‐pressure and pressurized slurry copolymerization is conducted at various ethylene/propylene feed ratios. This study finds that the copolymer composition strongly depends on the copolymerization yield rather than the active site nature for both of the normal‐pressure and pressurized copolymerization. The ethylene concentration becomes smaller than its equilibrium concentration during copolymerization primarily due to the great activity enhancement in the copolymerization and secondarily due to the high reactivity and low solubility of ethylene. It is shown that the decrease in the ethylene concentration during copolymerization causes the variation of the copolymer composition in a way dependent on the kinetic profile of employed catalysts, thus broadening the chemical composition distribution.

show abstract

“…[12][13][14][15] In order to increase the dosage accuracy, the prepared catalyst was diluted 10 times with dried hexane. The catalyst used contains 2.7% Ti (w/w).…”

Section: Methodsmentioning

confidence: 99%

Quantification of polyethylene wax in semibatch laboratory reactor and a study of different parameters on wax production as a by‐product in the slurry ethylene polymerization

Bayat

Abdouss

Javanbakht

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

In coordination polymerization of alpha-olefins utilizing Ziegler-Natta catalysts via slurry, polyolefin is produced with other by-products such as polyethylene wax. Wax is defined as a linear short chain saturated by hydrocarbons in the relevant industries. Hexane and heptane are two of the most common suspending agents for the slurry process and wax molecules are soluble or swollen in these kinds of liquids. After termination of polymerization, wax separates from the main product by physical processes. A procedure for wax quantification in a laboratory reactor is suggested. Also, impacts of various factors such as reaction duration, pressure, and cocatalyst on wax generation have been investigated.

show abstract

Kinetic and morphological study of a magnesium ethoxide‐based Ziegler–Natta catalyst for propylene polymerization

Cited by 42 publications

References 33 publications

Role of dispersion state of ti species in deactivation of MgCl2-supported Ziegler-Natta catalysts

Role of dispersion state of ti species in deactivation of MgCl2-supported Ziegler-Natta catalysts

Origin of Chemical Composition of Ethylene/Propylene Copolymer Produced with Ziegler–Natta Catalyst

Quantification of polyethylene wax in semibatch laboratory reactor and a study of different parameters on wax production as a by‐product in the slurry ethylene polymerization

Contact Info

Product

Resources

About