Separation of Polyvinyl Chloride from Plastic Mixture by Froth Flotation after Surface Modification with Ozone

Okuda, Tetsuji; Kurose, Keisuke; Nishijima, Wataru; Okada, Minoru

doi:10.1080/01919510701572907

Cited by 38 publications

(19 citation statements)

References 17 publications

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“…This could be due to the chloride groups on the surface of PVC being replaced with hydrophilic functional groups, e.g., hydroxyl groups and carboxyl groups. 14,17 Our earlier study also reported the physical surface changes caused by ozonation, as analyzed by atomic force microscopy (AFM). 17 The surface hydrophilicity may increase as a result of decreased surface roughness.…”

Section: Resultsmentioning

confidence: 99%

“…17 We tried to separate both fl exible and rigid PVCs from PET, PC, and PMMA using samples from 5-mm tubes by froth fl otation based on the different hydrophilicity produced by ozonation. 14 Figure 3a shows the change of the fl oating-settling behaviors of PVCs as a result of froth fl oatation before and after 10 min of ozonation. By increasing the mixing speed, the sedimentation of PVCs was promoted by preventing bubbles attaching and removing bubbles already attached on the surface of PVCs.…”

Section: Resultsmentioning

confidence: 99%

“…In a previous study, we selectively modifi ed the PVC surface by ozonation and achieved separation from PET, PC, and polymethyl methacrylate (PMMA), which have similar densities to PVC, in a small reactor using 5-mm tube samples. 14 The objective of the present study was the optimization of the conditions (fl otation cell size, polymer sample size, effect of fl otation solution temperature, and the effect of polymer surface fraction covered by bubbles) of froth fl otation for PVC separation.…”

Section: Introductionmentioning

confidence: 99%

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Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth floatation

Reddy

Okuda

Kurose

et al. 2010

J Mater Cycles Waste Manag

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Selective surface modifi cation of polyvinyl chloride (PVC) by ozonation was evaluated to facilitate the separation of PVC from other heavy plastics with almost the same density as PVC, especially polyethylene terephthalate (PET), by the froth fl otation process. The optimum froth fl otation conditions were investigated, and it was found that at 40°C, 90% of PVC and PET plastics fl oated. The bubble size became larger and the area covered with bubbles on the plastic surface was reduced with increasing temperature. Optimum PVC separation was achieved with the fl otation solution at 40°C and mixing at 180-200 rpm, even for sheet samples 10 mm in size. Combined treatment by ozonation and froth fl otation is a simple, effective, and inexpensive method for PVC separation from waste plastics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth floatation

Reddy

Okuda

Kurose

et al. 2010

J Mater Cycles Waste Manag

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“…This would be due to the change of the chloride groups on the surface of PVC into hydrophilic functional groups; hydroxyl group and carboxyl group [25][26][27]. In some other surface modification methods, e.g.…”

Section: The Effect Of the Ozonation On The Hydrophobicity Of Asr Polmentioning

confidence: 99%

“…If ozone can dechlorinate the surface of PVC particles, the hydrophilicity of PVC would increase. Our recent study in virgin polymers revealed that the ozonation could selectively increase the hydrophilicity of the PVC surface among polymer mixture including PET, PC and PMMA [26]. The PVC was successfully separated from the other polymers by the froth flotation based on the selective increase of hydrophilicity on the surface of PVC by ozonation.…”

Section: Introductionmentioning

confidence: 99%

Separation of polyvinyl chloride (PVC) from automobile shredder residue (ASR) by froth flotation with ozonation

Reddy

Kurose

Okuda

et al. 2007

Journal of Hazardous Materials

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The purpose of this study is to develop froth flotation to separate polyvinyl chloride (PVC) from automobile shredder residue (ASR) plastic mixtures of variable composition. Some polymers in ASR polymer mixtures have similar density and hydrophobicity with PVC and thus selective flotation of PVC from ASR polymer mixtures cannot be achieved. The present study focused on the surface modification of PVC with ozonation, and then the modified PVC can be separated from other polymers by the following froth flotation. The results of this study indicate that the selective recovery of PVC from real ASR polyethylene tetra pethelate (PET), polymethyl methacrylate (PMMA), polybutyl methacralate (PBMA), ethyl acrylate (EA), polycarbonate (PC) and rubber mixtures can be accomplished in a three-step process involving a gravity separation, ozonation and froth flotation. The rubber was removed from other heavy ASR (PVC, PET, PMMA, PBMA, EA and PC) polymers by froth flotation without mixing. It was found that ozonation process produced the desired difference in contact angle required (from 89.5 to 73.0 degrees ) for separation of PVC from other heavy ASR polymers, whereas the contact angles of other polymers was slightly decreased. The most of the load ASR, i.e. about 72.4% is floated away and 27.6% was settled down. The highest component 96.7% of PVC was recovered in the settled fraction. As a result of this research effort, the surface modification of PVC with ozonation can be efficiently useful to separate the PVC from other similar density ASR mixed polymers.

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Surface Design, Fabrication and Properties of Silicone Materials for Use in Tissue Engineering and Regenerative Medicine

Tambe

Cao

et al. 2014

Concise Encyclopedia of High Performance Silicones

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Separation of Polyvinyl Chloride from Plastic Mixture by Froth Flotation after Surface Modification with Ozone

Cited by 38 publications

References 17 publications

Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth floatation

Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth floatation

Separation of polyvinyl chloride (PVC) from automobile shredder residue (ASR) by froth flotation with ozonation

Surface Design, Fabrication and Properties of Silicone Materials for Use in Tissue Engineering and Regenerative Medicine

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