Artículos de revistas
A Molar Basis Comparison Of Calcium Hydroxide, Sodium Hydroxide, And Potassium Hydroxide On The Pretreatment Of Switchgrass And Miscanthus Under High Solids Conditions
Registro en:
Industrial Crops And Products. Elsevier Science Bv, v. 92, p. 165 - 173, 2016.
0926-6690
1872-633X
WOS:000383821200020
10.1016/j.indcrop.2016.08.010
Autor
Rodrigues
Carla Ines Soares; Jackson
Joshua J.; Montross
Michael D.
Institución
Resumen
Pretreatment is an essential step in the formation of liquid biofuels. Switchgrass and miscanthus were pre-treated using calcium hydroxide, potassium hydroxide, and sodium hydroxide at an equivalent hydroxyl concentration (0.46g OH-/g dry biomass), at a solids content of 40%, and two temperatures (25 and 50 degrees C) for seven days. The cellulose, hemicellulose, and lignin composition before and after pretreatment were quantified according to the standard procedures developed by the National Renewable Energy Laboratory. After pretreatment, enzyme hydrolysis was performed at 50 degrees C in a shaking incubator with an enzyme loading of 60 FPU/g cellulose. Potassium and sodium hydroxide led to the largest reduction in lignin of between 30-47% with the two feedstocks and two temperature levels. Calcium hydroxide had a significantly lower amount of delignification of between 13-21%. Sodium and potassium hydroxide had a similar maximum reaction rate, except for switchgrass pretreated at 50 degrees C where the reaction rate was lower for potassium hydroxide. Cellulose conversion was the highest for sodium and potassium hydroxide and varied between 56.1 and 80.5% for both feedstocks at the two pretreatment temperatures investigated. Calcium hydroxide demonstrated a significantly lower cellulose conversion that varied between 23.0 and 44.9%. The results indicated that with an equivalent molar basis of OH-, potassium and sodium hydroxide had superior performance relative to calcium hydroxide in a high solids environment. (C) 2016 Elsevier B.V. All rights reserved. 92 165 173 United States Department of Agriculture National Institute for Food and Agriculture Biomass Research and Development Initiative [2011-10006-30363] Hatch- Multistate [1002344, 1003563] National Institute of Food and Agriculture, U.S. Department of Agriculture