Study of input parameter changes toward low density polyethylene’s product properties

Bekri, Nur Liyana; Idris, Iylia; Som, Ayub Md; Murat, Muhamad Nazri; Rohman, Fakhrony Sholahudin; Ilyas, R.A.; Azmi, Ashraf

doi:10.1016/j.matpr.2022.11.140

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Furthermore, the reactions are possible only from the heavier to lighter lumps. This assumption was made, because the molecular weight generally decreases during pyrolysis and any polymerization reactions are negligible . Additionally, it is assumed that the reaction rate r ij (from lump i to lump j ) is of first order (eq ), and the reaction constant k ij follows the Arrhenius law (eq ).…”

Section: Lumped Kinetic Modelsmentioning

confidence: 99%

“…This assumption was made, because the molecular weight generally decreases during pyrolysis and any polymerization reactions are negligible. 37 Additionally, it is assumed that the reaction rate r ij (from lump i to lump j) is of first order (eq 1), and the reaction constant k ij follows the Arrhenius law (eq 2). Those assumptions are generally accepted for pyrolysis reactions in the literature.…”

Section: Lumped Kinetic Modelsmentioning

confidence: 99%

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Usefulness of Lumped Kinetic Modeling

Lorbach,

Lechleitner,

Zapf

et al. 2024

Chem Bio Eng.

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Chemical recycling of plastic wastes through pyrolysis, gasification, or partial oxidation is a promising alternative to landfill disposal and incineration which must be applied in a future circular economy. These technologies enable the chemical industry, which currently heavily relies on crude oil, to obtain necessary chemical feedstock from postconsumer plastic waste. Kinetic models of pyrolysis and gasification reactions are required to dimension and design these processes on an industrial scale. The creation of detailed kinetic networks is often not feasible due to their complexity in this application, which is when the lumped kinetic modeling approach is used. This work develops and compares five lumped kinetic models for the co-pyrolysis of LDPE with a heavy petroleum fraction in a tubular reactor. A priori lumping is used for four models, and the fifth is created using a posteriori principle whereby in each model the product mixture is defined by eight lumps distinguished by their boiling point. The aim of this work is to compare different approaches for modeling reaction pathways in lumped kinetic models and to identify their impact on the predictive accuracy of the model. It was shown that all of the modeling approaches and the resulting models have similar prediction accuracies and deviations but with different kinetic parameters. Each model was used for a scale-up of an industrial-sized reactor to check whether the model had an influence on the design or predicted operation of the reactor.

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Section: Lumped Kinetic Modelsmentioning

confidence: 99%

Section: Lumped Kinetic Modelsmentioning

confidence: 99%

Usefulness of Lumped Kinetic Modeling

Lorbach,

Lechleitner,

Zapf

et al. 2024

Chem Bio Eng.

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“…It is known that low‐density polyethylene (LDPE) is produced by free‐radical polymerization in tubular or autoclave reactors at high temperatures (up to 300 °C) and pressure (up to 3000 bar) in the presence of initiators [1, 2]. LDPE is a high clarity and chemically inert polymer, which is used in a variety of applications including liners, consumer bags, heavy‐duty sacks, caps, closures, toys, lamination, and agricultural films, owing to its flexibility, barrier properties, good impact strength, and stress crack resistance [3]. The current global LDPE market size is expected to grow from $51.11 billion in 2023 to $72.34 billion in 2027 at a CAGR of 9.1% [4].…”

Section: Introductionmentioning

confidence: 99%

High temperature‐size exclusion chromatography with triple detection to assess the molecular architecture of low‐density polyethylene: Insight into branching and processability correlations

Subbaiah,

Shanmugam,

Hau

2024

J of Separation Science

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In this study, three commercially available low‐density polyethylene (LDPE) polymers produced via a tubular reactor process, with varying melt flow rates at 190°C/2.16 kg (4.0, 1.9, and 0.75 g/10 min), have been selected and subjected to high temperature‐size exclusion chromatography (SEC) analysis coupled with an infrared‐5 (IR‐5), viscometer (VISCO), and multiangle laser light‐scattering detectors. The molecular weight (MW), MW distribution, short‐chain branching (SCB), and long‐chain branching parameters were investigated. It was found that MW obtained by the universal technique (∼1.57–1.7 times) and multiangle laser light‐scattering detection technique is (∼1.43–1.55 times) higher than that of the conventional calibration technique, which could be attributed to structural complexity associated with LDPEs which is not clearly understood by conventional SEC mode alone. The bulk SCB per 1000 total carbon atoms estimated by IR‐5 detection was found to range from 16.50 to 17.80. On the other hand, long chain branching frequency per 1000 total carbon atoms obtained by online VISCO and multiangle laser light‐scattering detection ranged from 0.46 to 0.54 and 0.65 to 0.94, respectively. Further, the significance of long chain branching parameters on the polymer processing behavior was studied in correlation with rheological property (Die swell ratio).

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