Thermal pyrolysis characteristics and kinetics study of reconstituted tobacco with different coating rates

Authors

ZHANG Guo, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan 450001, China
YUE Xian-ling, Technology Center of Heilongjiang Tobacco Industry Co., Ltd., Harbin, Heilongjiang 150001, China
YE Jian-bin, College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan 450001, China
HE Yuan, College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan 450001, China
ZHANG Jun-song, College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan 450001, China
LIANG Miao, College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan 450001, China

Abstract

In order to investigate the pyrolysis characteristics of reconstituted tobacco with different coating rates, thermogravimetry technique combined with Coats-Redfern method was adopted to study the pyrolysis behavior and the variation of kinetic parameters of main weight loss stages. Furthermore, the pyrolysis gas release behavior was monitored by TG-FTIR technique. The results showed that: ① The content of C increased gradually and the content of O decreased with the increase of coating rate of reconstituted tobacco. While the change in the microstructure of reconstituted tobacco was not obvious. ② The thermogravimetric process of reconstituted tobacco can be divided into five stages: drying dehydration （Stage Ⅰ）, the volatilization of component with low boiling point （Stage Ⅱ）, hemicellulose decomposition （Stage Ⅲ）, cellulose and lignin decomposition （Stage Ⅳ）, carbonization （Stage Ⅴ）. With the coating rate increased from 35% to 50%, the initial release temperature of volatiles T_i decreased gradually from 220.2 ℃ to 196.0 ℃, the final release temperature exhibited increase trend, and the maximum weight loss rate of stage Ⅲ and Ⅳ decreased. The comprehensive pyrolysis index （I_CP） decreased from 2.55×10^-4%/（min·℃²） to 1.51×10^-4%/（min·℃²） gradually with the increasing of coating rate. The heating rate also had a significant effect on the pyrolysis characteristic parameters of the samples. ③ The results of pyrolysis kinetics analysis based on Coats-Redfern method showed that the activation energy and pre-exponential factor stage Ⅳ were significantly higher than that of stage Ⅲ. The activation energy of stage Ⅲ increased from 133.08 kJ/mol to 160.10 kJ/mol with the increase of coating rate when under the same heating rate, while the activation energy of stage Ⅳ changed little. There was a kinetic compensation effect between the pyrolysis kinetic parameter E and lnA of reconstituted tobacco sample at different heating rates. In addition, the enthalpy change of stage Ⅲ increases from 128.48 kJ/mol to 155.52 kJ/mol with the increase of coating rate, which indicated that the coating components increased the energy required for pyrolysis. ④ The on-line FTIR analysis showed that the gas release during pyrolysis is mainly composed of small molecule gas （such as H₂O, CH₄, CO₂, CO, etc.） and light tar components （such as aldehyde, ketone, acids and phenols, etc.）. Among them, the amount of CO₂ is significantly higher than other components, followed by aldehyde, ketone, and acids that represented by CO, followed by the aromatic hydrocarbons and water.

Publication Date

5-28-2021

First Page

39

Last Page

46

DOI

10.13652/j.issn.1003-5788.2021.05.008

Recommended Citation

Guo, ZHANG; Xian-ling, YUE; Jian-bin, YE; Yuan, HE; Jun-song, ZHANG; and Miao, LIANG (2021) "Thermal pyrolysis characteristics and kinetics study of reconstituted tobacco with different coating rates," Food and Machinery: Vol. 37: Iss. 5, Article 8.
DOI: 10.13652/j.issn.1003-5788.2021.05.008
Available at: https://www.ifoodmm.cn/journal/vol37/iss5/8

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