Pretreatment of Corn Stover by Soaking in Aqueous Ammonia at Moderate Temperatures

Kim, Tae Hyun; Lee, Y. Y.

doi:10.1007/978-1-60327-181-3_8

Cited by 47 publications

(53 citation statements)

References 10 publications

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“…With SAA treatment at 60 o C, as reaction time increased (6 h to 24 h), enzymatic digestibility improved (69.4% to 71.5%). This confirmed the finding from previous studies that lignin removal has a positive impact on the enzymatic digestibility of treated solids [18,19]. However, slightly higher maximum digestibility (72.8%) was observed with SAA treatment for 12 h. A similar trend was observed for SAA treatment at 80 o C. Enzymatic digestibility was improved (72.8% to 86.2%) as reaction time increased (6 h to 12 h), but then decreased (to 84.4%) with SAA treatment for 24 h. We did not find any correlation between chemical composition and enzymatic digestibility in this study.…”

Section: Resultssupporting

confidence: 92%

“…The SAA method (first step) has been developed to improve the enzymatic digestibility of lignocellulosic biomass. Kim and Lee [18,19] reported that aqueous ammonia pretreatment at moderate temperature (60~80 ο C) retained most of the carbohydrates (cellulose and hemicellulose) as solids, but removed significant amounts of the lignin. Therefore, the liquid stream from the SAA treatment contains mostly lignin, and the solids remaining contain glucan and xylan.…”

Section: Introductionmentioning

confidence: 99%

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Recovery of Xylo-oligomer and Lignin Liquors from Rice Straw by Two 2-step Processes Using Aqueous Ammonia Followed by Hot-water or Sulfuric Acid

Truong¹,

Shrestha²,

Kim³

2015

Korean Chemical Engineering Research

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− A two-step process was investigated for pretreatment and fractionation of rice straw. The two-step fractionation process involves first, soaking rice straw in aqueous ammonia (SAA) in a batch reactor to recover lignin-rich hydrolysate. This is followed by a second-step treatment in a fixed-bed flow-through column reactor to recover xylooligomer-rich hydrolysate. The remaining glucan-rich solid cake is then subjected to an enzymatic process. In the first variant, SAA treatment in the first step dissolves lignin at moderate temperature (60 and 80 o C), while in the second step, hot-water treatment is used for xylan removal at higher temperatures (150~210 o C). Under optimal conditions (190 o C reaction temperature, 30 min reaction time, 5.0 ml/min flow rate, and 2.3 MPa reaction pressure), the SAA-hot-water fractionation removed 79.2% of the lignin and 63.4% of the xylan. In the second variant, SAA was followed by treatment with dilute sulfuric acid. With this process, optimal treatment conditions for effective fractionation of xylo-oligomer were found to be 80 o C, 12 h reaction time, solid-to-liquid ratio of 1:12 in the first step; and 5.0 ml H 2 SO 4 /min, 170 o C, and 2.3 MPa in the second step. After this two-step fractionation process, 85.4% lignin removal and 78.9% xylan removal (26.8% xylan recovery) were achieved. Use of the optimized second variant of the two-step fractionation process (SAA and H 2 SO 4 ) resulted in enhanced enzymatic digestibility of the treated solid (99% glucan digestibility) with 15 FPU (filter paper unit) of CTec2 (cellulase)/g-glucan of enzyme loading, which was higher than 92% in the twostep fractionation process (SAA and hot-water).

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Recovery of Xylo-oligomer and Lignin Liquors from Rice Straw by Two 2-step Processes Using Aqueous Ammonia Followed by Hot-water or Sulfuric Acid

Truong¹,

Shrestha²,

Kim³

2015

Korean Chemical Engineering Research

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show abstract

“…Although pretreatment with IL has been increased interest as a new technology since past few years, this technique has been too costly in application for lignocellulosic biomass pretreatment due to the high price of IL. Consequently, advanced technology with IL is requisite to make the technique further efficient while lowering the price (Kim and Lee 2007).…”

Section: Issn: 2319-7706 Volume 7 Number 05 (2018)mentioning

confidence: 99%

Enhanced Saccharification in Sugarcane Leaves by Combined Pretreatment of Ionic Liquid and Aqueous Ammonia

Singh¹,

Dubey²,

Verma³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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“…El remojo de los materiales se lleva a cabo a 60ºC durante 6 horas (Kim y Lee, 2007;Li et al, 2010), tiempo después del cual la reacción se detiene súbitamente enfriando el reactor en un baño de hielo, y posteriormente se filtra para separar las fracciones sólida y líquida. La fracción sólida se neutraliza y se lava para retirar el licor negro remanente, y se guarda para los procesos siguientes de hidrólisis y fermentación.…”

Section: Remojo Con Amoniaco Acuosounclassified

Efecto del Pretratamiento de Biomasa Maderera en el Rendimiento a Etanol

Gómez

Ríos

Peña³

2013

Inf. tecnol.

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Pretreatment of Corn Stover by Soaking in Aqueous Ammonia at Moderate Temperatures

Cited by 47 publications

References 10 publications

Recovery of Xylo-oligomer and Lignin Liquors from Rice Straw by Two 2-step Processes Using Aqueous Ammonia Followed by Hot-water or Sulfuric Acid

Recovery of Xylo-oligomer and Lignin Liquors from Rice Straw by Two 2-step Processes Using Aqueous Ammonia Followed by Hot-water or Sulfuric Acid

Enhanced Saccharification in Sugarcane Leaves by Combined Pretreatment of Ionic Liquid and Aqueous Ammonia

Efecto del Pretratamiento de Biomasa Maderera en el Rendimiento a Etanol

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