Pretreatment of rice straw with combined process using dilute sulfuric acid and aqueous ammonia

Kim, Sung Bong; Lee, Sang Jun; Lee, Ju Hun; Jung, You Jin; Thapa, Laxmi Prasad; Kim, Jun Seok; Um, Youngsoon; Park, Chulhwan; Kim, Seung Wook

doi:10.1186/1754-6834-6-109

Cited by 108 publications

(23 citation statements)

References 28 publications

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“…The changes in composition of the treated solid after the first fractionation step are summarized in Table 1. In a series of experiments, three different reaction times (6,12, and 24 h) were tested at two different reaction temperatures (60 o C and 80 o C), while keeping ammonia concentration and solid-to-liquid ration at 15% and 1:10, respectively. Major differences were observed in the lignin composition of the solid samples so treated.…”

Section: Resultsmentioning

confidence: 99%

“…Both cellulose and hemicellulose can readily be hydrolyzed into fermentable sugars by enzymes, and then further converted to create ethanol usable as fuel. Therefore, due to its immense annual production rice straw is potential feedstock for the production of ethanol [5][6][7]. Although cellulosic ethanol offers significant potential as a substitute for fossil fuels, the high production costs associated with the conversion technology are currently barriers to profitable commercialization.…”

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: Resultsmentioning

confidence: 99%

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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“…Studies recognized that alkaline pretreatment causes swelling of cellulose, leading to the decrease of degree of polymerization and crystallinity, and increases the surface area that facilitates more substrate exposed to cellulase attack [48]. However, the poor negative correlation between the cellulose crystallinity index and enzymatic digestion of fibers under different conditions (R 2 < 0.1) (Figure 5B − D), might be due to the dissolution of amorphous materials (xylan and lignin) and/or interference of other soluble materials [63,64].…”

Section: Effects Of Alkaline Pretreatment Of Pbd Manure Fiber On Subsmentioning

confidence: 88%

“…The more detailed relationship between the pretreatment parameters and pretreatment recovery following enzymatic digestion (dependent variables) of the PBD manure fiber was explored using less runs by using central composite design experiments [64,72]. Statistical software SAS JMP Pro version 10 was used for the design of experiments and to analyze the experimental data obtained.…”

Section: Severity Parameter and Statistical Data Analysismentioning

confidence: 99%

Combined sodium hydroxide and ammonium hydroxide pretreatment of post-biogas digestion dairy manure fiber for cost effective cellulosic bioethanol production

Elumalai

Espinosa

Markley

et al. 2014

Sustain Chem Process

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Background: The current higher manufacturing cost of biofuels production from lignocellulosics hinders the commercial process development. Although many approaches for reducing the manufacturing cost of cellulosic biofuels may be considered, the use of less expensive feedstocks may represent the largest impact. In the present study, we investigated the use of a low cost feedstock: post-biogas digestion dairy manure fiber. We used an innovative pretreatment procedure that combines dilute sodium hydroxide with supplementary aqueous ammonia, with the goal of releasing fermentable sugar for ethanol fermentation.

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“…Hence, it is necessary to disrupt the structure of the original cell wall during the process of cellulose bioconversion. For this reason, most research for bioconversion of lignocellulosic feedstock into simple sugars has focused on increasing the enzyme accessibility of cellulose by the removal of hemicellulose or lignin [3][4][5][6][7]. In order for cellulose to be more conducive to enzymatic saccharification, various pretreatment approaches for cellulosic resources have been developed, such as ball-milling, the use of dilute acid, alkaline treatment, ammonia explosion, and so on [1,3,5,8,9].…”

Section: Introductionmentioning

confidence: 99%

The correlation between the enzymatic saccharification and the multidimensional structure of cellulose changed by different pretreatments

Cui

Zhang

et al. 2014

Biotechnol Biofuels

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Background: The bioconversion of cellulose into simple sugars or chemicals has attracted extensive attention in recent decades. The crystal allomorphs of cellulose are key factor affecting cellulose saccharification. However, due to the influence of lignin, hemicelluloses, and different characterization methods in the literature, the effect of cellulose allomorphs on cellulose saccharification is still unresolved. Thus, a systematic research on the effect of different cellulose allomorphs on enzymatic saccharification was required. Results: Multiple approaches, including the use of ionic liquid (IL), ethylenediamine (EDA), glycerol, and sodium hydroxide, were used to pretreat α-cellulose in this work. The properties of the obtained cellulose (crystallinity, lattice spacing, specific surface area, and wettability) were characterized by X-ray diffraction, Brunauer, Emmett, and Teller (BET) specific surface area analysis, and water contact angle analysis, respectively. The distance of the lattice spacing of cellulose III was longer than that of other cellulose samples. The crystallinity and water contact angles of the cellulose samples were ranked in the following order: cellulose treated with IL < cellulose treated with NaOH < cellulose treated with EDA < cellulose without treatment < cellulose treated with glycerol. Cellulose treated with IL, with a crystallinity index value of 20%, was very close to amorphous cellulose. After 72 h hydrolysis, the cellulose conversion ratio ranged from 43% to 99%. Cellulose treated with IL exhibited the best hydrolysis profile, followed by cellulose treated with EDA.

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Pretreatment of rice straw with combined process using dilute sulfuric acid and aqueous ammonia

Cited by 108 publications

References 28 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

Combined sodium hydroxide and ammonium hydroxide pretreatment of post-biogas digestion dairy manure fiber for cost effective cellulosic bioethanol production

The correlation between the enzymatic saccharification and the multidimensional structure of cellulose changed by different pretreatments

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