Thermal Devolatilization Kinetics of Dry Distiller’s Grains with Solubles (DDGS)

Processes

Colomba Di Blasi¹  Carmen Branca² 

[1] Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli “Federico II”, P.le V. Tecchio, 80125 Napoli, Italy;Istituto di Sviluppo e Tecnologie per l’Energia e la Mobilità Sostenibili (STEMS), C.N.R., P.le V. Tecchio, 80125 Napoli, Italy;

关键词: DDGS;    pyrolysis;    devolatilization;    TGA;    kinetics;   

DOI  :  10.3390/pr9111907

来源: DOAJ

【 摘 要 】

Dynamic thermogravimetric analysis is applied to investigate the thermal devolatilization of dry distiller’s grain with solubles (DDGS), the major by-product of bioethanol plants. Compared with lignocellulosic biomass, the DDGS devolatilization occurs over a much wider temperature range and with slower rates. This reveals complex dynamics attributable to a peculiar chemical composition comprising, in addition to lignocellulose, proteins, starch and other minor components. The evolution of lumped volatile product classes is well described by a five-step reaction mechanism. The numerical solution of the ordinary differential equations together with a minimization of the objective function leads to activation energies invariant with the heating rate. The estimated values of 89, 120, 158, 102 and 113 kJ/mol are, on average, higher than those obtained under oxidative environments but still lower than those typically estimated for wood.

【 授权许可】

Unknown