Continuous distribution kinetics for degradation of polystyrene in sub- and supercritical toluene

Huang, Ke; Tang, Lihua; Zhu, Zhaojie; Ying, Weiyong

doi:10.1016/j.jaap.2005.11.005

Cited by 20 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that the rate of degradation in supercritical methanol is expected to be faster than that of pyrolysis at the same or lower temperatures. Other than supercritical methanol, depolymerization of PS to styrene monomers can also be achieved in SCW and supercritical toluene. , Notably, supercritical toluene afforded higher yields of styrene than supercritical benzene, p -xylene, and ethylbenzene from PS …”

Section: Functional Small Molecules From Polyolefins and Polystyrenementioning

confidence: 99%

See 1 more Smart Citation

Polyolefins and Polystyrene as Chemical Resources for a Sustainable Future: Challenges, Advances, and Prospects

Yeung

Teo

Loh

et al. 2021

ACS Materials Lett.

121

View full text Add to dashboard Cite

Nonbiodegradable plastics with inert and saturated C−C backbones comprise the majority of global annual plastics produced, including the ubiquitous polyolefins (polyethylene and polypropylene) and polystyrene. Unlike polymers with cleavable bonds, such as polyesters, polyurethanes, and polycarbonates, these inert plastics are the most challenging to upcycle and cannot be easily broken down by chemical or enzymatic means. Thus, they mostly end up in landfills or are incinerated to produce copious amounts of greenhouse emissions. In recent years, increased research effort has been focused toward the upcycling of low-value plastic waste to give them a new lease of life. However, the unreactive C−C polymer backbones of these plastics have posed formidable challenges for attempts at post-synthetic chemical functionalization and conversion into commodity chemicals. In this Perspective, we discuss these inert plastics as large untapped resources for the production of new functional polymeric materials and valuable industrially relevant feedstock, such as dicarboxylic acids and aromatic compounds. The exciting pioneering work featured herein will hopefully inspire a change in the way we view these waste plastics from a chemical deadend to versatile raw materials, forming the basis of a more sustainable materials economy.

show abstract

Section: Functional Small Molecules From Polyolefins and Polystyrenementioning

confidence: 99%

“…Other than supercritical methanol, depolymerization of PS to styrene monomers can also be achieved in SCW 129 and supercritical toluene. 130,131 Notably, supercritical toluene afforded higher yields of styrene than supercritical benzene, p-xylene, and ethylbenzene from PS. 130…”

Section: T H Imentioning

confidence: 99%

Polyolefins and Polystyrene as Chemical Resources for a Sustainable Future: Challenges, Advances, and Prospects

Yeung

Teo

Loh

et al. 2021

ACS Materials Lett.

121

View full text Add to dashboard Cite

show abstract

“…Madras et al , studied PS thermal degradation in mineral oil as a function of temperature (513–573 K) and the effect of hydrogen donors at 548 K by addition of 6-hydroxytetralin. Studies of PS degradation in benzene, toluene, n -hexane, acetone, n -pentane, or cyclohexane can be found in the literature, some of them in supercritical conditions. In general, the results suggest that degradation rates in supercritical solvents are slightly higher than those in solution at normal and high pressures and higher than thermal degradation rates of molten PS.…”

Section: Introductionmentioning

confidence: 99%

Transport Phenomena in Catalytic Hydrocracking of Polystyrene in Solution

Fuentes-Ordóñez

Salbidegoitia

González-Marcos

et al. 2013

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Mass transfer analysis in any experimental system is fundamental before studying its kinetics or optimizing a catalyst. The effect of several variables, such as stirring rate, catalyst concentration and particle size, hydrogen pressure, reaction temperature, polystyrene concentration and average molecular weight, both from the experimental and the theoretical point of view, have been studied in the catalytic hydrocracking of polystyrene dissolved in decahydronaphthalene carried out in a stirred tank with hydrogen and catalyst (0.58 wt % Pt/H-β) in a slurry. The results show that the variables could be adequately selected to prevent both gas–liquid and liquid–solid mass transfer control. However, severe internal diffusion control occurred as a consequence of polymer molecular dimensions that, in practice, limits the reaction to the outer surface area of the catalyst. Thus, catalyst optimization for this application, and catalytic processes with polymer reactants in general, should be focused on maximizing external surface area.

show abstract

“…Based on the degradation reaction mechanism, population balance equations are proposed and solved using the moment method, which leads to substantial simplification in mathematical analyses [17,18]. Goto et al [19], Lei Chen et al [20] and Ke Huang et al [21] used the Continuous-distribution kinetics to describe the process of polyethylene degradation in methanol, polycarbonate degradation in methanol and polystyrene degradation in toluene with concurrent random scission and chain-end scission. But using Continuousdistribution kinetics to describe the behavior of PBT degradation hasn't been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Continuous-distribution kinetics for degradation of polybutylene terephthalate (PBT) in supercritical methanol

Huang

Yang

Chyu

et al. 2009

Polymer Degradation and Stability

View full text Add to dashboard Cite

Continuous distribution kinetics for degradation of polystyrene in sub- and supercritical toluene

Cited by 20 publications

References 22 publications

Polyolefins and Polystyrene as Chemical Resources for a Sustainable Future: Challenges, Advances, and Prospects

Polyolefins and Polystyrene as Chemical Resources for a Sustainable Future: Challenges, Advances, and Prospects

Transport Phenomena in Catalytic Hydrocracking of Polystyrene in Solution

Continuous-distribution kinetics for degradation of polybutylene terephthalate (PBT) in supercritical methanol

Contact Info

Product

Resources

About