Thermogravimetric analyses (TGA) of lignins isolated from the residue of corn stover bioethanol (CSB) production

Yubo Tao; Shujun Li; Peng Li; Qinglin Wu

doi:10.1515/hf-2016-0022

Article

Thermogravimetric analyses (TGA) of lignins isolated from the residue of corn stover bioethanol (CSB) production

Yubo Tao , Shujun Li , Peng Li and Qinglin Wu

Published/Copyright: June 30, 2016

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From the journal Holzforschung Volume 70 Issue 12

Abstract

In the course of corn stover bioethanol (CSB) production, a lignin-rich residue is left behind, which is a potential feedstock for biofuel and other high-value products. In the present paper, this residual lignin was separated by precipitation from the alkali-solution and by extraction with organic solvents (benzyl alcohol, dioxane, and ethanol), respectively. Thermogravimetric analyses (TGA) at a heating rate of 30 K min^-1 showed that the degradation of all lignins took place in a temperature range between 400 K and 1073 K, with maxima at around 600 K. The char yield of alkali-lignin is higher than that of the CSB residue and the lignins isolated by organic solvents. Derivative TG (DTG) curves reflect well the comprehensive thermal degradation processes. The kinetic parameters according to the Kissinger’s method indicate that the CSB residue and all lignins follow approx. the first-order reaction law, except for benzyl alcohol lignin with n=1.4. As for the effects of separation methods, the DTG curves of benzyl alcohol lignin exhibited a less regular form and its wide temperature profile may have contributed to its apparently higher reaction order.

Keywords: corn stover bioethanol (CSB) production; derivative thermogravimetric analysis (DTGA); kinetic data derived from DTGA; lignin isolation; pyrolysis; thermogravimetric analysis (TGA)

Acknowledgments

We acknowledge the support from the Fundamental Research Funds for the Central Universities (Grant No.DL12CB07), the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (Grant No. 122044) and the Program for New Century Excellent Talents in University (NCET-13-0711).

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Received: 2016-1-29

Accepted: 2016-5-24

Published Online: 2016-6-30

Published in Print: 2016-12-1

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https://doi.org/10.1515/hf-2016-0022

Keywords for this article

corn stover bioethanol (CSB) production; derivative thermogravimetric analysis (DTGA); kinetic data derived from DTGA; lignin isolation; pyrolysis; thermogravimetric analysis (TGA)