Subcritical and supercritical water for chemical recycling of plastic waste

Water at the supercritical state is a new process for the chemical recycling. At this thermodynamic state i.e. Pc = 218 atmospheres and Tc = 374oC , water behaves very differently from its everyday temperament and it is a very good solvent for organic components. Experimental studies show that supercritical water can decompose hydrocarbons/polymers and produce useful products like 2-Azacyclotridecanone /lactam-1 from Nylon-12 (batch process). The decomposition process itself was carried out in batch reaction system in order to get more information about product distributions, time dependence, and scale-up possibilities.Keywords: supercritical water, decomposition, batch, polymer, hydrocarbon

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Sub- and supercritical water for chemical recycling of polyethylene terephthalate waste

Chemical Engineering Science ◽

10.1016/j.ces.2020.116389 ◽

2021 ◽

Vol 233 ◽

pp. 116389

Author(s):

Maja Čolnik ◽

Željko Knez ◽

Mojca Škerget

Keyword(s):

Polyethylene Terephthalate ◽

Supercritical Water ◽

Chemical Recycling

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Chemical recycling of plastic waste via thermocatalytic routes

Journal of Cleaner Production ◽

10.1016/j.jclepro.2021.128989 ◽

2021 ◽

pp. 128989

Author(s):

Jechan Lee ◽

Eilhann E. Kwon ◽

Su Shiung Lam ◽

Wei-Hsin Chen ◽

Jörg Rinklebe ◽

...

Keyword(s):

Plastic Waste ◽

Chemical Recycling

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Iron Catalyzed Synthesis and Chemical Recycling of Telechelic, 1,3-Enchained Oligocyclobutanes

10.26434/chemrxiv.11994489 ◽

2020 ◽

Author(s):

Megan Mohadjer Beromi ◽

C. Rose Kennedy ◽

Jarod M. Younker ◽

Alex E. Carpenter ◽

Sarah J. Mattler ◽

...

Keyword(s):

Molecular Weight ◽

Closed Loop ◽

Building Blocks ◽

Plastic Waste ◽

Low Molecular Weight ◽

Chemical Recycling ◽

Thermally Stable ◽

Hydrocarbon Feedstock ◽

High Crystallinity

Closed-loop recycling offers the opportunity to help mitigate plastic waste through reversible polymer construction and deconstruction. While examples of the chemical recycling polymers are known, few have been applied to materials derived from abundant commodity olefinic monomers that are the building blocks of ubiquitous plastic resins. Here we describe a [2+2] cycloaddition oligomerization of 1,3-butadiene to yield a previously unrealized telechelic microstructure of (1,n’-divinyl)oligocyclobutane. This material is thermally stable, has stereoregular segments arising from chain-end control, and exhibits high crystallinity even at low molecular weight. Exposure of the oligocyclobutane to vacuum in the presence of the pyridine(diimine) iron precatalyst used to synthesize it resulted in deoligomerization to generate pristine butadiene, demonstrating a rare example of closed-loop chemical recycling of an oligomeric material derived from a commodity hydrocarbon feedstock.

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