Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor

Shogo Kumagai; Guido Grause; Tomohito Kameda; Tatsuo Takano; Hideki Horiuchi; Toshiaki Yoshioka

doi:10.1021/ie102423m

Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor

Shogo Kumagai, Guido Grause, Tomohito Kameda, Tatsuo Takano, Hideki Horiuchi, Toshiaki Yoshioka

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L^-1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation.

Original language	English
Pages (from-to)	6594-6600
Number of pages	7
Journal	Industrial & Engineering Chemistry Research
Volume	50
Issue number	11
DOIs	https://doi.org/10.1021/ie102423m
Publication status	Published - 2011 Jun 1

Access to Document

10.1021/ie102423m

Cite this

@article{8a2e39fe20ce4665b834ac479cdda1ab,

title = "Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor",

abstract = "Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L-1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation.",

author = "Shogo Kumagai and Guido Grause and Tomohito Kameda and Tatsuo Takano and Hideki Horiuchi and Toshiaki Yoshioka",

year = "2011",

month = jun,

day = "1",

doi = "10.1021/ie102423m",

language = "English",

volume = "50",

pages = "6594--6600",

journal = "Industrial & Engineering Chemistry Research",

issn = "0888-5885",

publisher = "American Chemical Society",

number = "11",

}

TY - JOUR

T1 - Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor

AU - Kumagai, Shogo

AU - Grause, Guido

AU - Kameda, Tomohito

AU - Takano, Tatsuo

AU - Horiuchi, Hideki

AU - Yoshioka, Toshiaki

PY - 2011/6/1

Y1 - 2011/6/1

N2 - Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L-1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation.

AB - Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L-1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation.

UR - http://www.scopus.com/inward/record.url?scp=79959976755&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79959976755&partnerID=8YFLogxK

U2 - 10.1021/ie102423m

DO - 10.1021/ie102423m

M3 - Article

AN - SCOPUS:79959976755

SN - 0888-5885

VL - 50

SP - 6594

EP - 6600

JO - Industrial & Engineering Chemistry Research

JF - Industrial & Engineering Chemistry Research

IS - 11

ER -

Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor

Abstract

Access to Document

Other files and links

Fingerprint

Cite this