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    Acid-catalyzed autohydrolysis of wheat straw to improve sugar recovery
    (Elsevier Sci Ltd, 2014) Ertaş, Murat; Han, Qiang; Jameel, Hasan
    A comparison study of autohydrolysis and acid-catalyzed autohydrolysis of wheat straw was performed to understand the impact of acid addition on overall sugar recovery. Autohydrolysis combined with refining is capable of achieving sugar recoveries in the mid 70s. If the addition of a small amount of acid is capable of increasing the sugar recovery even higher it may be economically attractive. Acetic, sulfuric, hydrochloric and sulfurous acids were selected for acid-catalyzed autohydrolysis pretreatments. Autohydrolysis with no acid at 190 degrees C showed the highest total sugar in the prehydrolyzate. Enzymatic hydrolysis was performed for all the post-treated solids with and without refining at enzyme loadings of 4 and 10 FPU/g for 96 h. Acid-catalyzed autohydrolysis at 190 degrees C with sulfurous acid showed the highest total sugar recovery of 81.2% at 4 FPU/g enzyme charge compared with 64.3% at 190 degrees C autohydrolysis without acid. (C) 2014 Elsevier Ltd. All rights reserved.
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    Autohydrolysis pretreatment combined with refining for improved enzymatic hydrolysis of multiple feedstock
    (Amer Chemical Soc, 2014) Han, Qiang; Ertaş, Murat; Jameel, Hasan; Chang, Hou-min; Phillips, Richard
    [No Abstract Available]
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    Enzymatic hydrolysis of autohydrolyzed wheat straw followed by refining to produce fermentable sugars
    (Elsevier Sci Ltd, 2014) Ertaş, Murat; Han, Qiang; Jameel, Hasan; Chang, Hou-min
    Wheat straw was pretreated using an autohydrolysis process with different temperatures (160-200 degrees C) and times (10-20 min) in order to allow the recovery of hemicellulose in the filtrate and help open up the structure of the biomass for improved accessibility of enzymes during enzymatic hydrolysis. Autohydrolysis at 190 degrees C for 10 min provided the highest overall sugar (12.2/100 g raw wheat straw) in the autohydrolysis filtrate and recovered 62.3% of solid residue. Before enzymatic hydrolysis, the pulps obtained from each pretreatment condition were subjected to a refining post-treatment to improve enzyme accessibility. Enzymatic hydrolysis was performed for all the pretreated solids with and without refining post-treatment at the enzyme loadings of 4 and 10 FPU/g oven dry substrate for 96 h. A total of 30.4 g sugars can be recovered from 100 g wheat straw at 180 degrees C for 20 min with 4 FPU/g enzyme charge. (C) 2013 Elsevier Ltd. All rights reserved.