The Polymerisation of Isoprene with Catalysts based on Neodymium 2-Ethylhexyl Phosphate

Bubnova, S.V.; Bodrova, V. S.; D'yachkova, E.S.; Drozdov, B.T.; Васильев, В. А.

doi:10.1177/0307174x1404100903

Cited by 3 publications

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“…Из популяции с помощью оператора отбора выбираются две особи, которые скрещиваются между собой, в результате чего создается один или несколько векторов-потомков [9]. Вектор-потомок подвергается действию оператора мутации [10] (10) Кинетические параметры процесса полимеризации изопрена на неодимсодержащей каталитической системе приведены в работах [11,12]. Время протекания процесса полимеризации -85 мин.…”

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Search for the Optimal Value of the Initial Concentration of Diisobutylaluminum Hydride for the Regulation of the Polyisoprene Molecular Mass on a Neodymium-Containing Catalytic System

Антипина¹,

Miftakhov²,

Мустафина³

2020

Вестник Тверского Государственного Университета. Серия: Химия

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Статья посвящена нахождению оптимального значения начальной концентрации диизобутилалюминийгидрида для полимеризации изопрена на неодимсодержащей каталитической системе. Для исследования закономерностей протекания процесса полимеризации изопрена построена кинетическая модель, то есть система обыкновенных дифференциальных уравнений, выражающих динамику концентраций частиц, участвующих в процессе. Система дифференциальных уравнений высокой размерности сведена к конечному виду путем применения метода моментов. Приведена в общем виде постановка задачи поиска оптимальных значений начальных концентраций веществ химического процесса. В качестве метода решения поставленной оптимизационной задачи в работе использованы эволюционные методы, в основе одного из которых лежит генетический алгоритм. Проведен вычислительный эксперимент для процесса полимеризации изопрена по поиску оптимального значения начальной концентрации диизобутилалюминийгидрида с целью регулирования молекулярной массы полиизопрена. Показано, что рассчитанное значение концентрации диизобутилалюминийгидрида обеспечивает достижение заданного критерия оптимальности. The article is devoted to finding the optimal value of the initial concentration of diisobutylaluminum hydride for the polymerization of isoprene on a neodymium-containing catalyst system. The authors present a kinetic diagram of the polymerization of isoprene on a neodymium-containing catalyst system using two types of organoaluminum compounds: triisobutylaluminum and diisobutylaluminum hydride. To study the patterns of the polymerization of isoprene, a kinetic model is constructed, that is, a system of ordinary differential equations expressing the dynamics of the concentration of particles involved in the process. The system of high-dimensional differential equations is reduced to the final form by applying the method of moments. The general statement of the problem of finding the optimal values of the initial concentrations of the substances of the chemical process is given. As a method for solving the optimization problem posed, evolutionary methods are used in the work, one of which is based on a genetic algorithm. A computational experiment was conducted for the polymerization of isoprene to find the optimal value of the initial concentration of diisobutylaluminum hydride in order to control the molecular weight of polyisoprene. It is shown that the calculated value of the concentration of diisobutylaluminium hydride provides achievement of the specified optimality criterion.

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Search for the Optimal Value of the Initial Concentration of Diisobutylaluminum Hydride for the Regulation of the Polyisoprene Molecular Mass on a Neodymium-Containing Catalytic System

Антипина¹,

Miftakhov²,

Мустафина³

2020

Вестник Тверского Государственного Университета. Серия: Химия

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“…The equation describing the heating of the reaction mixture under conditions of an exothermic polymerisation reaction was obtained in the form: (2) with the boundary conditions:…”

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confidence: 99%

“…The time dependences of the temperature of the top of the layer T t (a) and the average monomer conversion U av (b) in the process of bulk polymerisation of isoprene with T 0 = −40°C and T max = 130°C in reactors of semispherical (r 0 = 10 mm) shape (1) and cylindrical (h = 3 mm) shape (2) with a reactor wall temperature T w = 42°C (1) and 88°C (2) Figure 2. The time dependences of the temperature of the top of the layer T t (a) and the average monomer conversion U av (b) in the process of bulk polymerisation of isoprene with T 0 = −40°C and T max = 100°C in reactors of semispherical (r 0 = 10 mm) shape (1) and cylindrical (h = 3 mm) shape (2) with a reactor wall temperature T w = 34°C (1) and 72°C (2) 4 mm. The isothermicity index of a layer of height h = 4 mm is naturally lower than the isothermicity index of a layer of height h = 3 mm (B 4 < B 3 ).…”

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confidence: 99%

Optimum Conditions for the Bulk Polymerisation of Isoprene

Elfimov

2016

International Polymer Science and Technology

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This article continues a cycle of investigations into the process of liquid-phase bulk polymerisation of isoprene in small-volume cells. The investigations were based on a developed mathematical model. It was shown by calculation and experiment that the optimum process takes place in small-volume cells of cylindrical shape with a height of the reaction layer of no more than 3–4 mm. The dependence of temperature on time, the average monomer conversion, and the polymerisation time were calculated, and the data obtained were compared with data for a reactor (small-volume cell) of semi-spherical shape. The temperature and time of polymerisation in different layers of the cylindrical cell were also calculated. From the data obtained it follows that the productivity of a cylindrical reactor in any case, even at a lower polymerisation temperature, is far higher than the productivity of a small-volume reactor of semi-spherical shape. The properties of the polyisoprene obtained – its physicomechanical properties, microstructure, and gel fraction content – are not inferior to and in some cases are superior to the properties of standard industrial SKI-3 specimens. Apparatus is recommended for the process.

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Isoprene Polymerization in the Presence of Phosphate Catalytic Systems Based on a Mixture of Neodymium and Gadolinium Salts

Novikova,

Levkovskaya,

Senderskaya

et al. 2023

Russ J Appl Chem

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The Polymerisation of Isoprene with Catalysts based on Neodymium 2-Ethylhexyl Phosphate

Cited by 3 publications

References 0 publications

Search for the Optimal Value of the Initial Concentration of Diisobutylaluminum Hydride for the Regulation of the Polyisoprene Molecular Mass on a Neodymium-Containing Catalytic System

Search for the Optimal Value of the Initial Concentration of Diisobutylaluminum Hydride for the Regulation of the Polyisoprene Molecular Mass on a Neodymium-Containing Catalytic System

Optimum Conditions for the Bulk Polymerisation of Isoprene

Isoprene Polymerization in the Presence of Phosphate Catalytic Systems Based on a Mixture of Neodymium and Gadolinium Salts

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