Hemicellulose extraction from slash pine sawdust by steam explosion with sulfuric acid

Physical and chemical characteristics of pretreated slash pine sawdust influence its enzymatic hydrolysis

“…Fuente del material a tratar (condiciones de elaboración en la referencia) HAD P 3mm (Stoffel et al, 2014) EV P 5mm y R 3mm (Stoffel et al, 2017) Tratamientos alcalinos P 3mm y R 80mesh (0,177mm) (Imlauer et al, 2013) Organosolv (soda-etanol) P 3mm (Kruyeniski et al, 2015) El rango seleccionado para el pretratamiento con explosión de vapor se seleccionó para evitar compactación en el reactor. En cambio, a la fracción empleada en los tratamientos alcalinos (P 3mm) se le retiraron los finos (P 80 mesh) para evitar el taponamiento de la recirculación del licor.…”

“…En cambio, a la fracción empleada en los tratamientos alcalinos (P 3mm) se le retiraron los finos (P 80 mesh) para evitar el taponamiento de la recirculación del licor. (a) 190 ºC; 7,5 min; 0,75 % smp H2SO4 (Stoffel et al, 2017) Explosión de vapor (a) 180 ºC, 5 min, 3 % smp H2SO4 Explosión de vapor (a) 200 ºC, 5 min, 3 % smp H2SO4 Explosión de vapor (a) 200 ºC; 5 min; 3 % smp H2SO4 (mat. húmedo) 9 Explosión de vapor ºC; 7,5 min; 0,75 % smi H2SO4 Explosión de vapor (a) (b) 180 ºC, 5 min, 3 % smp H2SO4 Explosión de vapor (a) (b) 200 ºC, 5 min, 3 % smp H2SO4 Explosión de vapor (b)NaOH-O2 (d) 10% consistencia, 15% smp NaOH, 120 min, 100ºC, 6 kg O2/cm 2 39 EtOH -NaOH (d) 23/77 etanol/ agua, 170°C, 140min, 28% smp NaOH, RLM: 6/1 (a) sometido a previa desresinación alcalina (60 min, 5% smi NaOH, 90ºC); (b) sometido a lavado alcalino posterior (60ºC, 60 min, 4% smp NaOH); (c) 0,11% AQsmi; (d) sometido a desresinación alcalina (60 min, 5% smi NaOH, 90ºC) + EV (200ºC, 5 min, 3% smp H2SO4); (e) sometido a desresinación alcalina (60 min, 5% smi NaOH, 90ºC) + HAD (150ºC, 30 min, 7,5 g/L H2SO4).…”

Techno‐economic assessment of carboxylic acids, furfural, and pellet production in a pine sawdust biorefinery

“…The temperature and time to maximize the extraction of hexoses by steam explosion were selected from previous studies performed by our research group. 29,39 The conditions of the steam explosion and the composition of the residual liquor were defined by Stoffel. 39 In the steam explosion step, the reactants are fed into a batch reactor and a 69% yield is assumed.…”

“…Pine sawdust represents an attractive raw material for the production of high‐value‐added compounds but its fractionation is complex due to its chemical composition, e.g. its high content resin acid content, hemicelluloses, and guaiacyl‐type lignin, which is not highly reactive . Steam explosion (SE) has shown to be one of the most successful pretreatments for the removal of hemicelluloses from lignocellulosic materials, including pine and in optimized conditions, SE allows the extraction of the hemicellulosic fraction from pine sawdust with low degradation …”

“…its high content resin acid content, hemicelluloses, and guaiacyl-type lignin, which is not highly reactive. 29 Steam explosion (SE) has shown to be one of the most successful pretreatments for the removal of hemicelluloses from lignocellulosic materials, including pine 30 and in optimized conditions, SE allows the extraction of the hemicellulosic fraction from pine sawdust with low degradation. 29 Currently, most processes and technologies for biorefineries are in development at pilot scale and at demonstration plants, so information about commercial plants is not available.…”