A kinetic study on the supercritical decrosslinking reaction of silane-crosslinked polyethylene in a continuous process

Baek, Bum Ki; La, Yun Ho; Na, Won Jun; Lee, Seung Hwan; Hong, Soon Man; Han, Haksoo; Lee, Youn Woo; Nam, Gi Joon; Koo, Chong Min

doi:10.1016/j.polymdegradstab.2016.01.019

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…90 Figure 13 depicts the design of the continuous supercritical process system, which consists of a multistage single screw extruder. 86 Using supercritical methanol, XLPE can be very efficiently de-cross-linked, and the most important variables influencing the rate of the de-cross-linking process are reaction temperature and gel content. 91 Closed recycling can enhance the low fluidity and poor moldability of silane XLPE without deteriorating its characteristics.…”

Section: Recycling Of Cross-linked Polyethylenementioning

confidence: 99%

“…By using supercritical water, high-yield phenol is obtained from phenol resin. , By using subcritical and supercritical water, the recycling of epoxy resin and polyether ether ketone can also be done . Supercritical alcohol can be used for recovering glass fibers from fiber-reinforced plastics. , A batch reactor was used to investigate the recycling of cross-linked polyethylene (XLPE) by a decross-linking process in supercritical methanol, and the kinetics of the reaction is also studied . XLPE can be recycled catalytically and thermally into the oil without undergoing de-cross-linking .…”

Section: Recycling Of Cross-linked Polyethylenementioning

confidence: 99%

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Review on Recycling of Cross-Linked Polyethylene

Selvin,

Shah,

Maria

et al. 2024

Ind. Eng. Chem. Res.

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Cross-linked polyethylene is one of the most widely used thermosetting plastics. Due to its low cost, lightweight, and exceptional insulation properties against electricity and heat, it is frequently used as an insulation material for wires and cables. This polymer attracted interest in several different applications, including building services, piping systems, hydronic radiant heating, cooling systems, etc. However, because XLPE is a thermosetting plastic with limited fluidity and poor moldability, recycling this cross-linked form of polyethylene is extremely important. Due to irreversible covalent cross-linking, recycling XLPE is a very challenging task, and it can contribute to serious environmental issues, including soil and air pollution because most of this industrial waste is buried in landfills or removed by incineration. Therefore, recycling this kind of material with a crosslinked network structure is highly problematic. Therefore, we need an energyefficient, cost-effective, and eco-friendly recycling process to safeguard our ecosystem. In this article, we are systematically reviewing the recent advances in the recycling of XLPE. The major challenges are also discussed.

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Section: Recycling Of Cross-linked Polyethylenementioning

confidence: 99%

Section: Recycling Of Cross-linked Polyethylenementioning

confidence: 99%

Review on Recycling of Cross-Linked Polyethylene

Selvin,

Shah,

Maria

et al. 2024

Ind. Eng. Chem. Res.

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“…Baek and co-workers studied the kinetics of the selective de-crosslinking of silane-XLPE in sc alcohols in a batch process [ 69 ] and in a continuous process [ 68 , 70 , 71 ]. For example, in their Ref.…”

Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

“…The work also shows that the de-crosslinking of XLPE in sc methanol occurs more efficiently for silane crosslinks than for peroxide ones. The reaction kinetics does not undergo significant changes upon transition from a batch process to a continuous process [ 70 ], indeed, the experimental data still indicates a first-order reaction. In addition, it was confirmed that the rate constant increases with increasing temperature according to the Arrhenius law.…”

Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

et al. 2022

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The main known patterns of thermal and/or catalytic destruction of high-molecular-weight organosilicon compounds are considered from the viewpoint of the prospects for processing their wastes. The advantages of using supercritical fluids in plastic recycling are outlined. They are related to a high diffusion rate, efficient extraction of degradation products, the dependence of solvent properties on pressure and temperature, etc. A promising area for further research is described concerning the application of supercritical fluids for processing the wastes of organosilicon macromolecular compounds.

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“…Rapid increase in the use of thermosetting resin and composite plastics has become a major issue as these plastics are particularly difficult to recycle and successful recycling methods are rare . As a difficult-to-recycle plastic, recycling of thermosetting polymers has attracted much attention for the reduction of environmental pollution and the conservation of natural resources . However, most thermosetting polymer wastes including epoxy, unsaturated polyester, and cross-linked polyethylene (XLPE) are burned as a fuel or buried without recycling due to their insolubility and infusibility that make their recycling challenging. , XLPE is one of the most widely used thermosetting cross-linked polymers; it has been widely used as an insulating material because of its low cost, lightweight, and remarkable insulating features against electricity and heat. , …”

Section: Introductionmentioning

confidence: 99%

Selective Decomposition Process and Mechanism of Si–O–Si Cross-Linking Bonds in Silane Cross-Linked Polyethylene by Solid-State Shear Milling

Sun

Yang

Wang

2020

Ind. Eng. Chem. Res.

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Material recycling of silane cross-linked polyethylene (Si-XLPE) by the solid-state shear milling (S 3 M) technology could produce thermoplastic polyethylene. To take advantage of thermoplastic polyethylene from Si-XLPE, the de-cross-linked mechanism of Si-XLPE in S 3 M must be evaluated. The products prepared by the S 3 M technology were characterized using gel content, molecular weight measurement (GPC), Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance ( 29 Si-NMR), and re-cross-linking test to obtain insight into the selective de-cross-linking effect of the S 3 M technology. The results had confirmed that a cross-linking element consisting of Si−O−Si chemical bonds was destroyed during S 3 M, which was responsible for the destruction of cross-linked structures of Si-XLPE materials, and the molecular structures of the resulting products were close to that of silane-grafted polyethylene. The mechanical properties of Si-XLPE materials prepared by the S 3 M technology before and after water-cross-linking treatment were compared. It was found that the products obtained by the S 3 M technology could still undergo the cross-linking reaction and form more silane-grafted polyethylene with the increase of milling cycles. Based on the results of this study, we expected that practical applications of de-cross-linking of Si-XLPE materials could be successfully achieved. In this study, favorable conditions were established for the direct recovery of thermoplastic polyethylene from Si-XLPE by the selective de-crosslinking reaction in S 3 M and an idea about the recycling of Si-XLPE materials was developed.

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A kinetic study on the supercritical decrosslinking reaction of silane-crosslinked polyethylene in a continuous process

Cited by 10 publications

References 18 publications

Review on Recycling of Cross-Linked Polyethylene

Review on Recycling of Cross-Linked Polyethylene

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

Selective Decomposition Process and Mechanism of Si–O–Si Cross-Linking Bonds in Silane Cross-Linked Polyethylene by Solid-State Shear Milling

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