Mechanism of gas formation in catalytic decomposition of polypropylene

Ishihara, Yumiko; Nanbu, Hidesaburo; Saido, Katsuhiko; Ikemura, Tadashi; Takesue, Tomoyuki; Kuroki, Takeshi

doi:10.1016/0016-2361(93)90318-v

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…In contrast to thermal degradation research, catalytic pyrolysis has been carried out by considering a variety of catalysts (Aguado et al, 1996;Audisio et al, 1992;Ohkita et al, 1993;Sakata et al, 1996) with little emphasis on the reactor design, with only simple adiabatic batch and fixed-bed reactors being used (Ishihara et al, 1993;Songip et al, 1993;Mordi et al, 1994). Also, even though catalysis has been used, this is often done by thermally degrading the polymer and passing the degradation products through the catalyst (Songip et al, 1993, Ohkita et al, 1993.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Catalytic Pyrolysis of High-Density Polyethylene over a HZSM-5 Catalyst in a Laboratory Fluidized-Bed Reactor

Sharratt¹,

Lin²,

Garforth³

et al. 1997

Ind. Eng. Chem. Res.

152

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High-density polyethylene (HDPE) was pyrolyzed over HZSM-5 catalyst using a specially developed laboratory fluidized-bed reactor operating isothermally at ambient pressure. The influence of reaction conditions including temperature, ratios of HDPE to catalyst feed, and flow rates of fluidizing gas was examined. The sodium form of siliceous ZSM-5, silicalite, containing very few or no catalytically active sites, gave very low conversions of polymer to volatile hydrocarbons compared with HZSM-5 (Si/Al ) 17.5) under the same reaction conditions. Experiments carried out with HZSM-5 gave good yields of volatile hydrocarbons with differing selectivities in the final products dependent on reaction conditions. Catalytic pyrolysis of HDPE performed in the fluidized-bed reactor was shown to produce valuable hydrocarbons in the range of C 3 -C 5 carbon number with a high olefinic content. The production of olefins with potential value as a chemical feedstock is potentially attractive and may offer greater profitability than production of saturated hydrocarbons and aromatics.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Catalytic Pyrolysis of High-Density Polyethylene over a HZSM-5 Catalyst in a Laboratory Fluidized-Bed Reactor

Sharratt¹,

Lin²,

Garforth³

et al. 1997

Ind. Eng. Chem. Res.

152

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“…Lattimer 16 reported that a series of residual propylene oligomers is present in polypropylene but most of these products are saturated hydrocarbons and have a molecular weight equal to 42n ϩ 2, (where n is the degree of polymerization). Ishihara and colleagues 17 described two major chemical structures in polypropylene oligomeric fraction:…”

Section: Resultsmentioning

confidence: 99%

Propylene oligomers: extraction methods and characterization by FTIR, HPLC, and SEC

Mansouri

Yagoubi

Scholler³

et al. 1999

J. Appl. Polym. Sci.

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Propylene oligomers were isolated from polymer matrix by dissolution precipitation and Soxhlet methods and characterized by Fourier transform infrared spectrometry, ultraviolet, high-performance liquid chromatography, and gel permeation chromatography. Both extracts showed that these hydrocarbon chemicals have a maximal absorption at 210 nm and are eluted from a C8 column with a strong mobile phase (tetrahydrofuran). However, their average molecular weights are different depending upon the quality of extraction: the fraction obtained by the dissolution-precipitation method is homogeneous in molecular weight, whereas the one obtained by Soxhlet extraction has a higher polydispersity index (M n /M w ). The specific migration test of propylene oligomers in a food simulant (isooctane) shows total diffusion within 60 min.

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“…However, this effect was closely related to the type of zeolites, mixing methods and irradiation conditions.Furthermore, in pyrolysis of properly irradiated PP-zeolite mixtures, new chemicals such as acetone, acetic acid and so on, could possibly be obtained in addition to traditional hydrocarbons. Ishihara et al, 1993 investigated the catalytic degradation of PP by silica-alumina at temperatures between 180 and 300°C in a semibatch reactor under a nitrogen flow. The production of gas precursors was found essential to decomposition.…”

Section: Catalyting Crackingmentioning

confidence: 99%

Recent Advances in the Chemical Recycling of Polymers (PP, PS, LDPE, HDPE, PVC, PC, Nylon, PMMA)

Achilias¹,

Andriotis²,

Koutsidis³

et al. 2012

Material Recycling - Trends and Perspectives

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Mechanism of gas formation in catalytic decomposition of polypropylene

Cited by 19 publications

References 9 publications

Investigation of the Catalytic Pyrolysis of High-Density Polyethylene over a HZSM-5 Catalyst in a Laboratory Fluidized-Bed Reactor

Investigation of the Catalytic Pyrolysis of High-Density Polyethylene over a HZSM-5 Catalyst in a Laboratory Fluidized-Bed Reactor

Propylene oligomers: extraction methods and characterization by FTIR, HPLC, and SEC

Recent Advances in the Chemical Recycling of Polymers (PP, PS, LDPE, HDPE, PVC, PC, Nylon, PMMA)

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