Chemical recycling of flexible PVC by oxygen oxidation in NaOH solutions at elevated temperatures

Yoshioka, Toshiaki; Furukawa, K.; Sato, Takehiko; Okuwaki, Akitsugu

doi:10.1002/(sici)1097-4628(19981003)70:1<129::aid-app13>3.0.co;2-2

Cited by 40 publications

(12 citation statements)

References 10 publications

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“…7-10 A wet-treatment process for effi cient de-Cl was developed wherein aqueous NaOH was used under high temperature and pressure conditions, which were obtained by employing an autoclave. [11][12][13][14] Recently, an effi cient method for de-Cl of PVC in NaOH/ethylene glycol (EG) solution was demonstrated at atmospheric pressure. This procedure takes advantage of the high boiling point of EG (196°C).…”

Section: Introductionmentioning

confidence: 99%

Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

Yoshihara

Grause

Kameda

et al. 2010

J Mater Cycles Waste Manag

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The recycling of poly(vinyl chloride) (PVC) is one of the most important issues in the treatment of waste plastics. To improve PVC recycling, it is necessary to develop new recycling techniques, including new techniques for the dechlorination of chlorine-containing polymers. It has been established that wet dechlorination of PVC in NaOH/ethylene glycol solution is more effective than dry dechlorination. In this study, the wet process was used, and the chemical modifi cation of PVC by nucleophilic substitution was considered for upgrading waste PVC. Chlorine was substituted in solution by several nucleophilic reagents, thus changing the properties of PVC. The reaction of PVC in Na 2 S/ethylene glycol solution at 170°C resulted in the formation of a mixture comprising 32% elimination and 26% substitution products. The scanning electron microscopy/ energy dispersive X-ray spectroscopy mappings and elementary analysis of PVC indicated that this chlorinesubstitution process led to cross-linking by sulfur.

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Section: Introductionmentioning

confidence: 99%

Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

Yoshihara

Grause

Kameda

et al. 2010

J Mater Cycles Waste Manag

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“…The landfills require a large amount of land area, which is not always available. Recently several disposal methods such as the blast furnace method and the liquefying method have been proposed ( − ). These methods are very effective but employ a dechlorination process that requires high-tem perature facilities.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Mechanochemical Dechlorination Rate of Poly(vinyl chloride)

Mio

Saeki

Kano

et al. 2002

Environ. Sci. Technol.

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Poly(vinyl chloride) (PVC) was ground in air with CaO in the presence of quartz powder as a grinding aid by a small-scale planetary ball mill to investigate the relation of the dechlorination rate of PVC with the impact energy of the balls calculated from a computer simulation based on the Discrete Element Method under various conditions. Mechanochemical dechlorination proceeds as the grinding progresses and is improved with an increase in both the mill speed and the amount of balls introduced into the mill. The same trend can be seen in the relation between the specific normal impact energy of the balls and the rotational speed. The relationship between the observed dechlorination rate and the computed normal impact energy of the balls is linear, with a correlation coefficient of 0.965. This relationship can be used to estimate the dechlorination rate of PVC in a large-scale planetary ball mill.

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“…Normally, lanthanum fluoride or ammonium fluoride has been employed as a fluoride source; a more economical fluoride source would be, however, expected in the field of LaOF production industries. In the meantime, lots of PVDF wastes have been emitted from industries which deal with electric products as well as PVDF commodities. , These wastes are burned out in disposal facilities, but harmful gases such as HF are emitted, so that another proper method for disposing of PVDF wastes has been required. − It would be useful for such PVDF wastes to reuse as a fluoride source in the synthesis of LaOF. However, little attention has been paid to the reuse of PVDF waste. − …”

Section: Introductionmentioning

confidence: 99%

“…11,12 These wastes are burned out in disposal facilities, but harmful gases such as HF are emitted, so that another proper method for disposing of PVDF wastes has been required. [13][14][15] It would be useful for such PVDF wastes to reuse as a fluoride source in the synthesis of LaOF. However, little attention has been paid to the reuse of PVDF waste.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Lanthanum Oxyfluoride by Grinding Lanthanum Oxide with Poly(vinylidene fluoride)

Lee

Zhang

Sanda

2001

Ind. Eng. Chem. Res.

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A mixture of lanthanum oxide and poly(vinylidene fluoride) (PVDF) was ground in air by a planetary ball mill to investigate the mechanochemical (MC) reaction between the two materials. The MC reaction proceeds with an increase in the grinding time, forming lanthanum oxyfluoride in the ground product. The reaction yield reaches about 98% at 240 min. The organic phases from PVDF in the ground sample after the MC reaction have C−O and C−O−H bindings.

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Chemical recycling of flexible PVC by oxygen oxidation in NaOH solutions at elevated temperatures

Cited by 40 publications

References 10 publications

Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

Upgrading of poly(vinyl chloride) by chemical modifications using sodium sulfide

Estimation of Mechanochemical Dechlorination Rate of Poly(vinyl chloride)

Mechanochemical Synthesis of Lanthanum Oxyfluoride by Grinding Lanthanum Oxide with Poly(vinylidene fluoride)

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