Improvement of sugar yields from corn stover using sequential hot water pretreatment and disk milling. (September 2016)

• Record Type: Journal Article
• Authors: Kim, Sun Min; Dien, Bruce S.; Tumbleson, M.E.; Rausch, Kent D.; Singh, Vijay
• Is Part Of: Bioresource technology. Volume 216(2016)
• Page Start: 706
• Page End: 713
• Publication Date: 2016-09
• Subjects: AFEX ammonia fiber explosion -- AISL acid insoluble lignin -- ASL acid soluble lignin -- cSF combined severity factor -- DA dilute acid -- FPU filter paper unit -- GOS glucooligosaccharide -- HW hot water -- HMF 5-hydroxymethylfurfural -- HPLC high performance liquid chromatography -- LAP laboratory analytical procedure -- LSD Fisher's protected least significant difference -- NREL National Renewable Energy Laboratory -- WDM wet disk milling -- XOS xylooligosaccharide; Hot water pretreatment -- Dilute acid pretreatment -- Disk milling -- Mechanical grinding -- Corn stover; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.06.003
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Two step pretreatments had synergistic effects in increasing sugar yields. Hot water pretreated sample were directly milled without a separation step. Dilute acid pretreated sample was washed before milling due to low pH. Two step pretreatments reduced particle size and milling energy consumption. Acid with milling had similar or higher sugar yields than hot water with milling. Abstract: Efficient pretreatment is essential for economic conversion of lignocellulosic feedstocks into monosaccharides for biofuel production. To realize high sugar yields with low inhibitor concentrations, hot water or dilute acid pretreatment followed by disk milling is proposed. Corn stover at 20% solids was pretreated with hot water at 160–200 °C for 4–8 min with and without subsequent milling. Hot water pretreatment and disk milling acted synergistically to improve glucose and xylose yields by 89% and 134%, respectively, compared to hot water pretreatment alone. Hot water pretreated (180 °C for 4 min) and milled samples had the highest glucose and xylose yields among all hot water pretreated and milled samples, which were comparable to samples pretreated with 0.55% dilute acid at 160 °C for 4 min. However, samples pretreated with 1% dilute acid at 150 °C for 4 min and disk milled had the highest observed glucose (87.3%) and xylose yields (83.4%).