BHET Crystallization in Water-Free PET Glycolysis Systems

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 30, 2024

Research in the last years has predominantly focused on optimizing depolymerization step of polyethylene terephthalate (PET) glycolysis, often overlooking at least equally critical downstream steps recovering monomer bis(2-hydroxyethyl) (BHET). This study BHET crystallization, a pivotal unit operation PET glycolysis. We successfully implemented water-free glycolysis process, eliminating complications associated with internal solvent and homogeneous catalyst recycling found most commonly applied processes. Based solubility measurements real reaction mixtures, crystallization experiments were performed 180 mL batch lab-scale setup. The simplest method (natural cooling, no stirring) yielded efficient result, whereas first employing established techniques (seeding, controlled did not succeed. simple approach resulted time min, filtration about 4.5 giving an overall process yield 71%. Further, our monomer/dimer product was repolymerized, demonstrating potential more environmentally friendly compared to conventional literature methods. lays groundwork for future aimed catalysts within minimize resources energy demand.

Language: Английский

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Facilitating Polymorphic Crystallization of HMX Through Ultrasound and Trace Additive Assistance

Published: Jan. 1, 2024

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Language: Английский

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Current Status and Development Trend of Research on Polymer-Based Kinetic Inhibitors for Natural Gas Hydrates

Polymers, Journal Year: 2024, Volume and Issue: 16(14), P. 1985 - 1985

Published: July 11, 2024

As the understanding of natural gas hydrates as a vast potential resource deepens, their importance future clean energy source becomes increasingly evident. However, trend towards secondary generation during extraction and transportation, leading to safety issues such pipeline blockages. Consequently, developing new efficient hydrate inhibitors has become focal point in research. Kinetic (KHIs) offer an effective solution by disrupting nucleation growth processes without altering thermodynamic equilibrium conditions. This paper systematically reviews latest research progress development trends KHIs for hydrates, covering history, classification, inhibition mechanisms. It particularly focuses on chemical properties, effects, mechanisms polymer polyvinylpyrrolidone (PVP) polyvinylcaprolactam (PVCap). Studies indicate that these provide economical due low dosage environmental friendliness. Additionally, this explores impact biodegradability inhibitors, offering guidance research, including development, optimization, assessment inhibitors. Through comprehensive analysis existing work aims theoretical foundation technical reference commercial promoting safe use resource.

Language: Английский

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CMAS resistance characteristics of Gd2(Hf0.7Ce0.3)2O7 thermal barrier material at 1300 °C and 1400 °C

Surface and Coatings Technology, Journal Year: 2024, Volume and Issue: 493, P. 131251 - 131251

Published: Aug. 17, 2024

Language: Английский

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Polymorphism of 3-hydroxy-2-naphthoic acid: crystal structures, Hirshfeld surface analysis and properties

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1321, P. 139799 - 139799

Published: Sept. 1, 2024

Language: Английский

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