Basic study on a continuous flow reactor for thermal degradation of polymers

Katsuhide Murata, Y. Hirano, Y. Sakata, Azhar Uddin

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

A continuous flow reactor for thermal degradation of polymer such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) was operated at the feed rate of 0-1.5 kg h-1 in order to investigate the characteristics of the continuous flow operation and the thermal degradation behavior of polymers. Rate studies on thermal degradation of polymers were made at various temperatures and under a steady state. The activation energies, calculated on the basis of the rate of volatilization, were 221, 216 and 208 kJ mol-1 for thermal degradation of PE, PP and PS, respectively. These activation energies indicate that a chemical reaction takes a role of rate controlling step in this reactor system. By continuous flow operation, polymers were converted to the liquid product with high yield of 93.6-96.2, 96.1-99.1 and 99.9 wt.% for PE, PP and PS. The liquid products consisted of a wide spectrum of hydrocarbons distributed C4-C30. Thermal degradation by continuous flow operation is a suitable technique for converting plastic polymers into liquid hydrocarbons which could be used as feed stock materials. Based on the observed information, a macroscopic mechanism was proposed. The thermal degradation of polymers consists of two distinct reactions which simultaneously occur in the reactor. One is a random scission of links which causes a molecular weight reduction of the raw polymer, and the other is a chain-end scission of C-C bonds, which causes the generation of the volatile product. The chain-end scission takes a place at the gas-liquid interface in the working reactor.

Original languageEnglish
Pages (from-to)71-90
Number of pages20
JournalJournal of Analytical and Applied Pyrolysis
Volume65
Issue number1
DOIs
Publication statusPublished - Oct 2002

Fingerprint

thermal degradation
Polymers
Pyrolysis
reactors
polymers
Polypropylenes
Polystyrenes
Polyethylene
polypropylene
Polyethylenes
polyethylenes
cleavage
polystyrene
Liquids
liquids
Hydrocarbons
products
Activation energy
hydrocarbons
weight reduction

Keywords

  • Continuous flow operation
  • Macroscopic mechanism
  • Polyethylene
  • Polypropylene
  • Polystyrene
  • Thermal degradation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

Cite this

Basic study on a continuous flow reactor for thermal degradation of polymers. / Murata, Katsuhide; Hirano, Y.; Sakata, Y.; Uddin, Azhar.

In: Journal of Analytical and Applied Pyrolysis, Vol. 65, No. 1, 10.2002, p. 71-90.

Research output: Contribution to journalArticle

@article{4c7ff1dc787944a0bf57d9aa7eeb7c29,
title = "Basic study on a continuous flow reactor for thermal degradation of polymers",
abstract = "A continuous flow reactor for thermal degradation of polymer such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) was operated at the feed rate of 0-1.5 kg h-1 in order to investigate the characteristics of the continuous flow operation and the thermal degradation behavior of polymers. Rate studies on thermal degradation of polymers were made at various temperatures and under a steady state. The activation energies, calculated on the basis of the rate of volatilization, were 221, 216 and 208 kJ mol-1 for thermal degradation of PE, PP and PS, respectively. These activation energies indicate that a chemical reaction takes a role of rate controlling step in this reactor system. By continuous flow operation, polymers were converted to the liquid product with high yield of 93.6-96.2, 96.1-99.1 and 99.9 wt.{\%} for PE, PP and PS. The liquid products consisted of a wide spectrum of hydrocarbons distributed C4-C30. Thermal degradation by continuous flow operation is a suitable technique for converting plastic polymers into liquid hydrocarbons which could be used as feed stock materials. Based on the observed information, a macroscopic mechanism was proposed. The thermal degradation of polymers consists of two distinct reactions which simultaneously occur in the reactor. One is a random scission of links which causes a molecular weight reduction of the raw polymer, and the other is a chain-end scission of C-C bonds, which causes the generation of the volatile product. The chain-end scission takes a place at the gas-liquid interface in the working reactor.",
keywords = "Continuous flow operation, Macroscopic mechanism, Polyethylene, Polypropylene, Polystyrene, Thermal degradation",
author = "Katsuhide Murata and Y. Hirano and Y. Sakata and Azhar Uddin",
year = "2002",
month = "10",
doi = "10.1016/S0165-2370(01)00181-4",
language = "English",
volume = "65",
pages = "71--90",
journal = "Journal of Analytical and Applied Pyrolysis",
issn = "0165-2370",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Basic study on a continuous flow reactor for thermal degradation of polymers

AU - Murata, Katsuhide

AU - Hirano, Y.

AU - Sakata, Y.

AU - Uddin, Azhar

PY - 2002/10

Y1 - 2002/10

N2 - A continuous flow reactor for thermal degradation of polymer such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) was operated at the feed rate of 0-1.5 kg h-1 in order to investigate the characteristics of the continuous flow operation and the thermal degradation behavior of polymers. Rate studies on thermal degradation of polymers were made at various temperatures and under a steady state. The activation energies, calculated on the basis of the rate of volatilization, were 221, 216 and 208 kJ mol-1 for thermal degradation of PE, PP and PS, respectively. These activation energies indicate that a chemical reaction takes a role of rate controlling step in this reactor system. By continuous flow operation, polymers were converted to the liquid product with high yield of 93.6-96.2, 96.1-99.1 and 99.9 wt.% for PE, PP and PS. The liquid products consisted of a wide spectrum of hydrocarbons distributed C4-C30. Thermal degradation by continuous flow operation is a suitable technique for converting plastic polymers into liquid hydrocarbons which could be used as feed stock materials. Based on the observed information, a macroscopic mechanism was proposed. The thermal degradation of polymers consists of two distinct reactions which simultaneously occur in the reactor. One is a random scission of links which causes a molecular weight reduction of the raw polymer, and the other is a chain-end scission of C-C bonds, which causes the generation of the volatile product. The chain-end scission takes a place at the gas-liquid interface in the working reactor.

AB - A continuous flow reactor for thermal degradation of polymer such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) was operated at the feed rate of 0-1.5 kg h-1 in order to investigate the characteristics of the continuous flow operation and the thermal degradation behavior of polymers. Rate studies on thermal degradation of polymers were made at various temperatures and under a steady state. The activation energies, calculated on the basis of the rate of volatilization, were 221, 216 and 208 kJ mol-1 for thermal degradation of PE, PP and PS, respectively. These activation energies indicate that a chemical reaction takes a role of rate controlling step in this reactor system. By continuous flow operation, polymers were converted to the liquid product with high yield of 93.6-96.2, 96.1-99.1 and 99.9 wt.% for PE, PP and PS. The liquid products consisted of a wide spectrum of hydrocarbons distributed C4-C30. Thermal degradation by continuous flow operation is a suitable technique for converting plastic polymers into liquid hydrocarbons which could be used as feed stock materials. Based on the observed information, a macroscopic mechanism was proposed. The thermal degradation of polymers consists of two distinct reactions which simultaneously occur in the reactor. One is a random scission of links which causes a molecular weight reduction of the raw polymer, and the other is a chain-end scission of C-C bonds, which causes the generation of the volatile product. The chain-end scission takes a place at the gas-liquid interface in the working reactor.

KW - Continuous flow operation

KW - Macroscopic mechanism

KW - Polyethylene

KW - Polypropylene

KW - Polystyrene

KW - Thermal degradation

UR - http://www.scopus.com/inward/record.url?scp=0036784230&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036784230&partnerID=8YFLogxK

U2 - 10.1016/S0165-2370(01)00181-4

DO - 10.1016/S0165-2370(01)00181-4

M3 - Article

AN - SCOPUS:0036784230

VL - 65

SP - 71

EP - 90

JO - Journal of Analytical and Applied Pyrolysis

JF - Journal of Analytical and Applied Pyrolysis

SN - 0165-2370

IS - 1

ER -