Metal-Catalyzed Oxidation of Polyethylene

Alter, Harvey

doi:10.1021/ie50602a026

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…Results obtained on initial runs with granulated virgin materials (PE, PS, and PVC) produced separated fractions with less than 1% contamination. Alter (1960) described the rapid oxidation of polyethylene wastes using oxygen or ozone and Co, Cr, or Mn salts as catalysts. The products were low melting waxes with infrared spectra suggesting they may be useful as feed for single cell protein-producing animals.…”

Section: Other Proposalsmentioning

confidence: 99%

Resource recovery: A new field for technology application

Abert¹,

Zusman²

1972

AIChE Journal

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This review paper surveys the state-of-the-art of resource recovery from municipal, primarily residential, refuse. Unfortunately, progress in effecting the actual installation of full-sized recovery facilities has been minimal. The work that has been done has been beset with technical, and more often, economic difficulties. However, the rising cost of traditional means of disposal may allow new systems to become economically competitive. Past research and development efforts hold out promise of success and the nation may soon see the application of efficient technological solutions that in some localities will actually reduce the cost of refuse disposal below that of traditional means.

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Section: Other Proposalsmentioning

confidence: 99%

Resource recovery: A new field for technology application

Abert¹,

Zusman²

1972

AIChE Journal

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“…Polymer It was found that in many cases the viscosity behaviour of a polymer changed drastically when the composition of its solution was changed, see Table 1. Therefore, as the viscosity-molecular weight relation varied from case to case, and, in general, was not established, i t was not possible to calculate the degradation rate according to (5) an3 (9). Instead, as a more qualitative measure, the degradation rate was given as the relative rate of decrease of the specific viscosity, d/dt (qsp).…”

Section: Intrinsic Viscosities and Schulz-blaschke Constants In Difmentioning

confidence: 99%

Degradation of some polymers in aqueous solutions

Vink

1963

Makromol. Chem.

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I n the present work the degradation of some linear polymers in aqueous solutions was studied. The degradation was followed by a viscometric method rHld a presentation of thk theeretical background of this is given. The experiments were carried out with different polymers and it was found that those having oxygen bridges in the molecular backbone were much more readily degraded than those with a backbone of only carbon-carbon bonds. The degradation was found to be catalyzed by certain impurities, especially chromic and ferric ions, and a detailed investigation of this effect was made. ZUSAMMENFASSUNG:Abbaustudien an einigen linearen Polymeren in wasseriger Losung mittels einer viskosimetrischen Methode, deren theoretische Grundlagen dargelegt werden, ergaben, daf3 Polymere mit Sauerstoffbrucken im Molekiilskelett leichter abgebaut werden als solche mit nur aus Kohlenstoff aufgebauten Skeletten. Es wurde gefunden, daf3 der Abbau durch gewisse Verunreinigungen katalysiert wird, und zwar speziell durch dreiwertige Chrom-und Eisenionen. Dieser Effekt wurde eingehend untersucht.The present investigation deels with degradation processes encountered with some linear polymers in aqueous solutions. It was carried out using a viscosimetric method similar t o that described in an earlier publication1). The viscosimetric method has many advantages for practical reasons. The degradation is carried out in the viscometer and the measurements can be performed simply and in rapid succession. Thus, rather fast degradation reactions can be studied. On the other hand, due to the high relative accuracy of the viscosity measurements the method is also very sensitive and therefore even very slow processes can be accurately studied. Only under certain conditions, however, are the degradation data amenable to a straightforward quantitative treatment. The main requirements are that the degradation process is a random process and that the viscosity-molecular weight relation can be established. A detailed description of the method can be found in ref. 1. Here only the main features of the procedure, with some complementary remarks, will be given.

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“…A prominent example of such a feedstock is obtained from the oxidation of HDPE, which has been explored already in the early days of polyolefin technology. [16][17][18] More recently, this process has re-emerged to prominence with Co(II)/Mn(II) catalyzed oxidation by air, [19] promoted by N-hydroxphtalimide initiator, [20] which has been established as a strategy for the valorization of HDPE waste to dicarboxylic acids (DCAs). [21][22][23] Utilization of the resulting multiple chain length DCAs as microbial feedstocks has been demonstrated for the production of polyhydroxyalkanoates, [22] or other high-value chemical compounds.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it would be desirable to use lower value monomer sources, which contain distributions of multiple chain lengths, provided that the resulting polymers have properties on par with those from single chain length monomers. A prominent example of such a feedstock is obtained from the oxidation of HDPE, which has been explored already in the early days of polyolefin technology [16–18] . More recently, this process has re‐emerged to prominence with Co(II)/Mn(II) catalyzed oxidation by air, [19] promoted by N‐hydroxphtalimide initiator, [20] which has been established as a strategy for the valorization of HDPE waste to dicarboxylic acids (DCAs) [21–23] .…”

Section: Introductionmentioning

confidence: 99%

Degradable and Recyclable Polyesters from Multiple Chain Length Bio‐ and Waste‐Sourceable Monomers

Nelson,

Rothauer,

Sander

et al. 2023

Angew Chem Int Ed

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Monomers sourced from waste or biomass are often mixtures of different chain lengths; e.g. catalytic oxidation of polyethylene waste yields mixtures of dicarboxylic acids (DCAs). Yet, polyesters synthesized from such monomer mixtures have rarely been studied. We report polyesters based on multiple linear aliphatic DCAs, present in chain length distributions that vary in their centers and ranges. We demonstrate that these materials can adopt high‐density polyethylene‐like solid state structures, and are ductile (e.g. Et 610 MPa), allowing for injection molding, or film and fiber extrusion. Melting and crystallization points of the polyesters show no odd‐even effects as dipoles cannot favorably align in the crystal, similar to traditional odd carbon numbered, long‐chain DCA polyesters. Biodegradation studies of 13C‐labelled polyesters in soil reveal rapid mineralization, and depolymerization by methanolysis indicates suitability for closed‐loop recycling.

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Metal-Catalyzed Oxidation of Polyethylene

Cited by 17 publications

References 3 publications

Resource recovery: A new field for technology application

Resource recovery: A new field for technology application

Degradation of some polymers in aqueous solutions

Degradable and Recyclable Polyesters from Multiple Chain Length Bio‐ and Waste‐Sourceable Monomers

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