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

Document Type

Article

Publication Date

12-1-2016

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.

Publication Source (Journal or Book title)

Holzforschung

First Page

1175

Last Page

1182

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