Optimal parameters of butadiene polymerization in the synthesis of rubber on a neodymium-containing catalytic system

Aminova, G. A.; Manuiko, G. V.; Игнашина, Т. В.; Bronskaya, V. V.; Kharitonova, N. E.; D’yakonov, G. S.; Arkhireev, V. P.

doi:10.1134/s004057950601009x

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…In accordance with literature, [23][24][25][26][27] there are several active sites with different sensibilities in relation to aging. The structure of the catalytic sites is one of the main factors affecting all parameters of a catalytic system.…”

Section: Resultssupporting

confidence: 88%

“…Some possible structures for these sites are shown in Figure 4. [23][24][25][26][27] Most of them are bimetallic complexes and involve an alkylated lanthanide metal. In addition, they differ both in the environment of the lanthanide atom (number of Cl and C atoms) and in the number of lanthanide-carbon bonds at which the polymer chain propagates.…”

Section: Resultsmentioning

confidence: 99%

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Effect of aging conditions of neodymium‐based catalysts on cis‐1,4 polymerization of butadiene

Mello

Coutinho

2009

J of Applied Polymer Sci

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The aim of this work is to evaluate the effect of aging conditions catalysts based on neodymium salt on polymerization conversion, catalyst activity, and polymer characteristics. The synthesized catalysts were aged at 10, 25, 40, and 60C for 24 and 48 h. The polybutadienes were characterized by size exclusion chromatography to determine the molecular weight characteristics and infrared spectroscopy to determine the microstructure. The results showed that the stereoselectivity of active catalyst sites was not affected by the aging conditions. However, the molecular weight increased with aging temperature. The catalysts aged at 25 C showed a trend to attain higher activities than those aged at 40 and 60C. Moreover, a significant drop on polymerization reaction rate occurred as the catalyst aging temperature increased.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Effect of aging conditions of neodymium‐based catalysts on cis‐1,4 polymerization of butadiene

Mello

Coutinho

2009

J of Applied Polymer Sci

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“…Moreover, the copolymerization conditions, such as reaction time (2 hours The literature [10][11][12][13] shows several possible structures for active sites ( Figure 1) formed from the catalytic system used in this work. The existence of these different types of active sites does not mean they all are present at the same time.…”

Section: Resultsmentioning

confidence: 99%

“…When 1-dodecene was used as comonomer, the reduction in the conversion was so significant that no [10][11][12][13] . Silva, G. M. et al -Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system polymer was formed when about 10% wt of 1-dodecene was added.…”

Section: Silva G M Et Al -Copolymerization Of 1-hexene and 1-dodementioning

confidence: 99%

Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system

et al. 2014

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Abstract:The aim of this study was to incorporate an alpha-olefin (1-hexene or 1-dodecene) in a high cis polybutadiene chain, using a neodymium versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system. The influence of alpha-olefin on polymerization reaction and polymer characteristics, using different weight ratios of butadiene/α-olefin, was evaluated. The copolymers were characterized by SEC, FTIR, NMR, TGA and viscosimetric analysis. The thermal stability of the polymer tended to increase with incorporation of alpha-olefins, while its microstructure was not affected. The weight average molecular mass (Mw) tended to increase and the polymerization conversion tended to decrease with increasing alpha-olefins content. The copolymers showed a lower intrinsic viscosity than for the homopolymer. The results indicated that the alpha-olefins were incorporated in the polybutadiene chain.

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“…To increase the flexibility of the heating plant when commissioning the new RCU 140/12, it is necessary to provide a cross-connection between the live steam boilers so that when one of the power units is stopped, RCU 140/12 remains in operation [3,4]. Estimation of the power unit operation duration and equipment layout characteristics should take into account that crossconnection for live steam should be arranged between power units 3, 4, and 7, as the most loaded ones [5,6]. The hot steam header diameter will be 125 mm to ensure the required performance of RCU 140/12.…”

Section: A Construction Of Rcu 140/12 With a Steam Capacity Of 50 T/h And Reconstruction Of Rcu 12/6mentioning

confidence: 99%

Options for Modernization of Heat Supply to Consumers of Condensing Power Plant

Balzamov

Akhmetova

Balzamova

2021

Energy Systems Research

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High competition and strict requirements of the wholesale electricity and capacity market make optimization of heat supply schemes an urgent issue for generating companies. Replacement of life-expired generation equipment with new capacities based on advanced technologies is a priority goal for the energy industry development. This work focuses on condensing power plant (CPP), which is the only source in the city that supplies heat to all consumer categories. The plant carries out quantitative and qualitative heat supply regulation according to the temperature profile of 135/70°C with a cutoff of 110/70°C. The study examines the possibility of CPP modernization based on three options: building a pressure-reducing cooling unit 140/12, commissioning an auxiliary boiler house, and building a 110 MW combined-cycle gas plant. This paper presents technical solutions for the considered options and preliminary technical and economic calculations of their efficiency.

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Optimal parameters of butadiene polymerization in the synthesis of rubber on a neodymium-containing catalytic system

Cited by 17 publications

References 2 publications

Effect of aging conditions of neodymium‐based catalysts on cis‐1,4 polymerization of butadiene

Effect of aging conditions of neodymium‐based catalysts on cis‐1,4 polymerization of butadiene

Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system

Options for Modernization of Heat Supply to Consumers of Condensing Power Plant

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