Recovery of Terephthalic Acid by employing magnetic nanoparticles as a solid support

Ghamary, Elmira; Nikje, Mir Mohammad Alavi; Andabil, Seyedeh Leila Rahmani; Sarchami, Lida

doi:10.1590/0104-1428.2201

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…A peak at δ = 13.27 ppm (2H) attributed to protons of carboxylic groups ( COOH). 27 Thus, the NMR spectrum confirms the synthesis of TPA from BHETA. 15 From the TGA analysis, it is observed that PET is thermally more stable than BHETA, this is because of the long polymer chain present in PET.…”

Section: H-nmr Analysissupporting

confidence: 56%

“…The sharp singlet peak of the aromatic ring's protons appears at δ = 8.04 ppm (4H). A peak at δ = 13.27 ppm (2H) attributed to protons of carboxylic groups (COOH) 27 . Thus, the NMR spectrum confirms the synthesis of TPA from BHETA.…”

Section: Resultsmentioning

confidence: 52%

“…Figure 4 shows the FTIR spectrum of TPA. The appearance of broad and scattered peaks in the range of 3300–2500 cm −1 indicates the presence of OH stretching vibration of the carboxylic group 27 . OH group wagging is observed at 935 cm −1 .…”

Section: Resultsmentioning

confidence: 98%

“…The appearance of broad and scattered peaks in the range of 3300-2500 cm À1 indicates the presence of O H stretching vibration of the carboxylic group. 27 O H group wagging is observed at 935 cm À1 . A sharp peak at 1683 cm À1 is attributed to the stretching vibration of the C O group.…”

Section: Functional Group Analysismentioning

confidence: 94%

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A facile approach toward the synthesis of terephthalic acid via aminolytic depolymerization of PET waste and studies on the kinetics of depolymerization

Radadiya

Shahabuddin

Gaur

2023

Journal of Polymer Science

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In this polymer‐governing era, polyethylene terephthalate (PET) has become one of the most demanding consumables. This growing interest in the production and consumption of plastic products results in an increase in the volume of post‐consumer plastic waste. However, due to the growing concern for environmental protection, recycling PET waste to the valuable ones has become one of the hot topics in contemporary research. In this study, PET waste was depolymerized using ethanolamine as a depolymerizing agent. N,N′‐Bis(2‐hydroxyethyl)terephthaldiamide (BHETA) (yield 77%) was obtained after depolymerization of PET via ethanolamine. The characterization of the monomer BHETA was done using FTIR, 1H NMR, and FE‐SEM. The thermal stability of PET and BHETA was done using TGA analysis. To avoid the extreme reaction condition (high temperature and high pressure) of conventional way to form terephthalic acid (TPA) via hydrolysis of PET waste, in this study, a facile way is performed. The monomer BHETA was converted to a main building block of PET (TPA) (yield 67%) using strong oxidizing agent KMnO4 in mild reaction conditions at room temperature and pressure. The synthesized TPA was characterized using FTIR and 1H NMR. This work also focuses on the anticipation of the reaction progress of aminolysis of PET using simple analytical tools namely, FTIR and TGA.

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Section: H-nmr Analysissupporting

confidence: 56%

Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 98%

Section: Functional Group Analysismentioning

confidence: 94%

See 2 more Smart Citations

A facile approach toward the synthesis of terephthalic acid via aminolytic depolymerization of PET waste and studies on the kinetics of depolymerization

Radadiya

Shahabuddin

Gaur

2023

Journal of Polymer Science

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Dual catalytic performance of arene‐ruthenium amine complexes for norbornene ring‐opening metathesis and methyl methacrylate atom‐transfer radical polymerizations

Cruz

Silva

Oliveira

et al. 2020

Applied Organom Chemis

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Arene ruthenium(II) complexes bearing the cyclic amines RuCl2(η6‐p‐cymene)(pyrrolidine)] (1), [RuCl2(η6‐p‐cymene)(piperidine)] (2), and [RuCl2(η6‐p‐cymene)(peridroazepine)] (3) were successfully synthesized. Complexes 1–3 were fully characterized by means of Fourier transform infrared, UV–visible, and NMR spectroscopy, elemental analysis, cyclic voltammetry, computational methods, and one of the complexes was further studied by single crystal X‐ray crystallography. These compounds were evaluated as catalytic precursors for ring‐opening metathesis polymerization (ROMP) of norbornene (NBE) and atom‐transfer radical polymerization (ATRP) of methyl methacrylate (MMA). NBE polymerization via ROMP was evaluated using complexes 1–3 as precatalysts in the presence of ethyl diazoacetate (EDA) under different [NBE]/[EDA]/[Ru] ratios, temperatures (25 and 50°C), and reaction times (5–60 min). The highest yields of polyNBE were obtained with [NBE]/[EDA]/[Ru] = 5000/28/1 for 60 min at 50°C. MMA polymerization via ATRP was conducted using 1–3 as catalysts in the presence of ethyl‐α‐bromoisobutyrate (EBiB) as initiator. The catalytic tests were evaluated as a function of the reaction time using the initial molar ratio of [MMA]/[EBiB]/[Ru] = 1000/2/1 at 95°C. The increase in molecular weight as function of time indicates that complexes 1–3 were able to mediate the MMA polymerization with an acceptable rate and some level of control. Differences in the rate of polymerization were observed in the order 3 > 2 > 1 for the ROMP and ATRP.

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Optimization of PET depolymerization for enhanced terephthalic acid recovery from commercial PET and post consumer PET-bottles via low-temperature alkaline hydrolysis

Teke,

Saud,

Bhattarai

et al. 2024

Chemosphere

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Recovery of Terephthalic Acid by employing magnetic nanoparticles as a solid support

Cited by 3 publications

References 16 publications

A facile approach toward the synthesis of terephthalic acid via aminolytic depolymerization of PET waste and studies on the kinetics of depolymerization

A facile approach toward the synthesis of terephthalic acid via aminolytic depolymerization of PET waste and studies on the kinetics of depolymerization

Dual catalytic performance of arene‐ruthenium amine complexes for norbornene ring‐opening metathesis and methyl methacrylate atom‐transfer radical polymerizations

Optimization of PET depolymerization for enhanced terephthalic acid recovery from commercial PET and post consumer PET-bottles via low-temperature alkaline hydrolysis

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