Development of Dechlorination Technology for the Liquefaction Recycling of Municipal Waste Plastics

Fukushima, Masaaki; Ibe, Hidetoshi; Wakai, Keiji; Sugiyama, Eiichi; Abe, Hidetsugu; Wu, Beili; Kitagawa, K.; Tsuruga, Shigenori; Shimura, Katsumi; Ōno, Eiichi

doi:10.3985/jjsmcwm.22.178

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Traditional methods for PVC dechlorination applied to chemical recycling include conventional heating of PVC plastic waste at more than 600 K using a single or double screw extruder (Tokihisa et al, 2001;Fukushima et al, 2011) or a rotary kiln (Asanuma et al, 2000). A high dechlorination ratio of over 90% can be accomplished with either of these devices.…”

Section: Introductionmentioning

confidence: 99%

Selective Dechlorination of Polyvinyl Chloride by Microwave Irradiation

Kobayashi

Hori

Kobayashi³

et al. 2019

J. Chem. Eng. Japan

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The present study investigates microwave irradiation to develop the recycling technology of any kind of plastic waste containing organic chlorine, dechlorination. Polyvinyl chloride (PVC) was used as a typical organic chlorine. Under constant sample temperature, the PVC dechlorination properties were compared between microwave irradiation and conventional heating. It was clari ed that microwave irradiation induced much faster dechlorination than conventional heating. It was also found that the dechlorination reaction by microwave irradiation progressed at a lower temperature than that by convention heating. Moreover, the e ciency of dechlorination, de ned as the ratio of dechlorination to total weight loss, using microwave irradiation was higher than that by conventional heating. This result shows the possibility of selective dechlorination by using microwave irradiation.

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Section: Introductionmentioning

confidence: 99%

Selective Dechlorination of Polyvinyl Chloride by Microwave Irradiation

Kobayashi

Hori

Kobayashi³

et al. 2019

J. Chem. Eng. Japan

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Feedstock Recycling <i>via</i> Waste Plastic Pyrolysis

Kumagai

2016

J. Jpn. Petrol. Inst.

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Plastics are essential materials for various products such as packaging and containers, electrical and electronic equipment, and automobiles. Japanese production of polymers was reported as 10.6 million t in 2014 1) , with the majority prepared from finite fossil resources. Currently, in excess of 150 and 200 different types of polymers and additives, respectively, are produced and distributed within Japan 2 ) . Metals and fillers are further mixed with these products to achieve the desired properties, giving innumerable combinations. Thus, no single recycling technique can treat all types of waste plastics. Consequently, waste plastics are commonly treated by mechanical recycling, feedstock recycling, and energy recovery, depending on the waste composition and the purpose of the recycled products.The Plastic Waste Management Institute reported that 9.3 million t of waste plastics were collected in 2014 in Japan 1 ) . The utilized rate (mechanical recycling feedstock recycling energy recovery) for collected waste plastics was 83 %, and is increasing yearly. Utilization can be broken down into 70 % energy recovery, 26 % mechanical recycling, and 4 % feedstock recycling. According to the Basic Law for Establishing the Recycling-based Society, the order of priority of these techniques is as follows: mechanical recycling feedstock recycling energy recovery. Therefore, the ideal and actual situations show a wide gap.Feedstock recycling is a growing field in Japan, but is challenging due to the mismatch with current domestic recycling systems. However, advances in research and technical development show the potential to achieve an advanced recycling-based society. In Japan, monomerization, blast furnace reduction, coke oven chemical feedstock recycling, liquefaction, and gasification are categorized as feedstock recycling. In this paper, we focus on liquefaction and gasification, which are based on the pyrolysis technique.Pyrolysis converts polymeric materials into gases, liquids, and solids at high temperatures in the absence of oxygen. This process cleaves various chemical bonds in polymers and additives by the action of only heat, which is advantageous for low-purity waste that cannot be treated by mechanical recycling. Polyethylene (PE), polypropylene (PP), and polystyrene (PS) are the main polymeric materials produced worldwide, so have been widely studied. In addition, these materials are good quality carbon and hydrogen resources (PE and PP: 86 % C and 14 % H; PS: 92 % C and 8 % H). In contrast, the pyrolysis of polyvinyl chloride (PVC) and poly(ethylene terephthalate) (PET) Recycling of waste plastics is essential for reducing environmental degradation and ensuring future resource security. The quantity of domestic plastic waste recycled is increasing yearly, reaching 83 % in 2014. However, only 26 % and 4 % of the recycled waste plastic is treated by mechanical and feedstock recycling, respectively, whereas 70 % is treated by energy recovery (incineration). Therefore, the mechanical and feedstock recycling ra...

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Development of Dechlorination Technology for the Liquefaction Recycling of Municipal Waste Plastics

Cited by 2 publications

References 5 publications

Selective Dechlorination of Polyvinyl Chloride by Microwave Irradiation

Selective Dechlorination of Polyvinyl Chloride by Microwave Irradiation

Feedstock Recycling <i>via</i> Waste Plastic Pyrolysis

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