Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization

Huang, Junjie; Yan, Dongxia; Li, Fēi; Lü, Xingmei; Xin, Jiayu

doi:10.1016/j.jece.2021.106277

Cited by 28 publications

(15 citation statements)

References 34 publications

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“…The recovered BHET can be incorporated into virgin BHET, and this mixture can be utilized for two different PET production processes; that is, DMT-or terephthalic acid (TPA)-based processes. [75] Recently, Huang et al [76] has developed a recrystallization process using ethyl acetate as the solvent which specifically used to remove colored impurities from BHET. In this initial stage of project, a colored BHET model with a single source of colored impurities was used.…”

Section: Applications Of Glycolysis Productsmentioning

confidence: 99%

Recycling of polyethylene terephthalate wastes: A review of technologies, routes, and applications

Suhaimi

Muhamad

Razak

et al. 2022

Polymer Engineering & Sci

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With increasing usage of polyethylene terephthalate (PET) wastes polluting the oceans and environment, the recycling of PET wastes has become a crucial issue to be overcome. In this article, a review of the different technologies that have been developed to recycle PET wastes and common routes for recycled PET (rPET) is presented. The impacts of varied recycling technologies on the properties of rPET are also discussed herein. The review also focuses on the recovered products by each of the technology and their uses that have been reincorporated into new applications for example, from plastic bottle wastes to 3D scaffolds for biomedical application. Different recycling technologies such as reactive extrusion, chemical recycling and dissolution/precipitation exhibit specific properties due to the influence of the different concepts from one technology to another. A new trend called electrospinning of rPET to produce nanofibers has also garnered attention to be used for different applications. This article will first introduce the recycling technologies concept, and then the properties of the recovered product will be discussed and finally, we will focus on the applications of rPET produced from each of the technologies in various fields such as construction, textile, filtration, and biomedical applications.

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Section: Applications Of Glycolysis Productsmentioning

confidence: 99%

Recycling of polyethylene terephthalate wastes: A review of technologies, routes, and applications

Suhaimi

Muhamad

Razak

et al. 2022

Polymer Engineering & Sci

View full text Add to dashboard Cite

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“…Huang et al presented a modified recrystallization process using ethyl acetate as the solvent needed to remove colored impurities from BHET. The process showed a decoloring rate of over 97.5% for the model-colored impurities, performing better than the reported physical adsorption processes [242].…”

Section: Decolorization Technology In Textile Recyclingmentioning

confidence: 59%

Possibility Routes for Textile Recycling Technology

et al. 2021

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The fashion industry contributes to a significant environmental issue due to the increasing production and needs of the industry. The proactive efforts toward developing a more sustainable process via textile recycling has become the preferable solution. This urgent and important need to develop cheap and efficient recycling methods for textile waste has led to the research community’s development of various recycling methods. The textile waste recycling process can be categorized into chemical and mechanical recycling methods. This paper provides an overview of the state of the art regarding different types of textile recycling technologies along with their current challenges and limitations. The critical parameters determining recycling performance are summarized and discussed and focus on the current challenges in mechanical and chemical recycling (pyrolysis, enzymatic hydrolysis, hydrothermal, ammonolysis, and glycolysis). Textile waste has been demonstrated to be re-spun into yarn (re-woven or knitted) by spinning carded yarn and mixed shoddy through mechanical recycling. On the other hand, it is difficult to recycle some textiles by means of enzymatic hydrolysis; high product yield has been shown under mild temperatures. Furthermore, the emergence of existing technology such as the internet of things (IoT) being implemented to enable efficient textile waste sorting and identification is also discussed. Moreover, we provide an outlook as to upcoming technological developments that will contribute to facilitating the circular economy, allowing for a more sustainable textile recycling process.

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“…116,117 Also, glycolysis cannot tolerate low-quality PET waste and may be limited in recovery of valuable comonomers. [118][119][120] Alcoholysis was first proposed in 1991 by Wang et al to reduce the adverse effects of glycolysis technique for PET recycling. 121 The reaction medium is an alcohol such as methanol, pentaerythrytol, 1-butanol, and 1-pentanol where the PET degradation occurs to produce corresponding esters of TPA and EG as the main products, as shown in Figure 4.…”

Section: Chemical Recycling: Promising Approach For Sustainable Manag...mentioning

confidence: 99%

“…However, the drawbacks of the technique include the harmful effects of the reaction solvent to the environment and the need to separate the monomer from catalyst and EG 116,117 . Also, glycolysis cannot tolerate low‐quality PET waste and may be limited in recovery of valuable comonomers 118–120 …”

Section: Chemical Recycling: Promising Approach For Sustainable Manag...mentioning

confidence: 99%

A focused review on recycling and hydrolysis techniques of polyethylene terephthalate

Abedsoltan

2023

Polymer Engineering & Sci

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Polyethylene terephthalate (PET) is used in textile and packaging industries. The main source of PET production is fossil fuels with limited capacity. Also, PET products are single use that transform into high volumes of wastes, causing ecosystem problems. Recycling is proposed to confront this challenge. The four major PET recycling techniques are mechanical, chemical, pyrolysis, and enzymatic. Mechanical, pyrolysis, and enzymatic techniques have constrained capabilities to manage PET waste. Chemical recycling is the potential path to expanding recycling PET waste with possibility of upcycling and addressing dirty waste streams. Several chemical methods are introduced and discussed in literature. The five major chemical recycling techniques are glycolysis, alcoholysis, aminolysis, ammonolysis, and hydrolysis. This review describes PET depolymerization via these techniques and introduces hydrolysis as the one that can depolymerize PET in an organic‐free solvent environment. Hydrolysis tolerates PET mixed wastes streams including copolymers. It helps avoid challenges attributed to using organic solvents in reaction systems. Moreover, hydrolysis produces terephthalic acid, PET monomer, which has recently gained attention as the initiative monomer for PET production. The review focuses on three forms of hydrolysis—alkaline, neutral, and acid, by presenting background studies, issued patents, and recent trends on application of hydrolysis.

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Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization

Cited by 28 publications

References 34 publications

Recycling of polyethylene terephthalate wastes: A review of technologies, routes, and applications

Recycling of polyethylene terephthalate wastes: A review of technologies, routes, and applications

Possibility Routes for Textile Recycling Technology

A focused review on recycling and hydrolysis techniques of polyethylene terephthalate

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