Comparison of Yellow Poplar Pretreatment Between NREL Digester and Sunds Hydrolyzer

Tucker, Melvin P.; Farmer, J. D.; Keller, Fred A.; Schell, Daniel J.; Nguyen, Quang

doi:10.1007/978-1-4612-1814-2_4

Cited by 6 publications

(12 citation statements)

References 6 publications

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“…Corn stover was pretreated with dilute sulfuric acid in an engineering‐scale countercurrent pretreatment reactor system, a 200 kg dry biomass/day capacity Sunds hydrolyzer (Metso Paper USA Inc., Norcross, GA) using 1.4% acid concentration, 8‐min residence time, and 190 °C temperature. The details of the hydrolyzer setup and operation are described by Nguyen et al (43) and Tucker et al (44). The pretreated corn stover slurry was separated into liquor and solid fractions, and the solid fraction was washed (45) and used in the experiments.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of carboxymethyl cellulose powder and films from Mimosa pigra

Rachtanapun

Rattanapanone

2011

J of Applied Polymer Sci

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Mimosa pigra peel was sun-dried for 2 days and then ground before being boiled with 30%w/v sodium hydroxide (NaOH) at 100 C for 3 h, washed and then dried at 55 C to constant weight. The cellulose was then synthesized using different NaOH concentrations and monochloroacetic acid (MCA) in isopropyl alcohol (IPA). Effects of various NaOH concentrations on degree of substitution (DS), viscosity and thermal of carboxymethyl cellulose from Mimosa pigra peel (CMC m ) were investigated. The increasing of NaOH concentration resulted in increasing DS and viscosity. However, viscosity of CMC m decreased as temperature increased. Thermal properties were studied using differential scanning calorimetry (DSC). The melting point of the samples decreased as %NaOH increased. The effects of various NaOH concentrations in CMC m synthesis on the mechanical properties and water vapor permeability (WVP) of the CMC m films were investigated as well. With increasing NaOH concentrations (30-50%) were also found to result in improved mechanical properties. However, when the level of NaOH concentration was 60%, the mechanical properties of the CMC films decreased. This result indicates that the highest mechanical properties were found for 50% NaOH-synthesized CMC m films. The WVP of the CMC m films increased as %NaOH increased. In addition, the CMC m films were tested to determine the effect of glycerol as a plasticizer on the mechanical properties. Increasing the amount of glycerol showed an increase in elongation at break but also led to a decrease in tensile strength.

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of carboxymethyl cellulose powder and films from Mimosa pigra

Rachtanapun

Rattanapanone

2011

J of Applied Polymer Sci

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“…The pretreatment section of the PDU consists of a Sunds CD-300 Laboratory Hydrolyzer (Sunds Defibrator, Norcross, GA). 11, 12 A custom-built aqueous fractionation apparatus was also employed in this work. A process schematic is shown in Figure 1.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…2,5,[8][9][10] Dilute acid pretreatment has been developed at the pilot-plant scale at the National Renewable Energy Laboratory (NREL, Golden, CO). 11,12 Recent advances in dilute acid pretreatment at the bench scale have considerably increased recovery of xylan, a valuable hemicellulose that may also be used to produce chemicals such as xylitol and furfural. A multistage process operated in a manner to simulate countercurrent contacting of solids and liquid using very dilute sulfuric acid (0.07 wt %) in two discrete temperature stages (174 and 204 °C) has reported recovery of soluble xylose equivalents of 97%.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

Allen¹,

Schulman²,

Lichwa³

et al. 2001

Ind. Eng. Chem. Res.

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Pretreatment of fresh yellow poplar sawdust (<6 mm, 25−30 wt % moisture) with hot liquid water (190−220 °C, 2.0−7.5 min, 2−7 wt % solids loading) or steam (220 °C, 2.0 min) was compared with dilute acid pretreatment (0.8% w/v sulfuric acid, 175 °C, 10 min, 20−25 wt % solids loading). The most favorable conditions for hot liquid water pretreatment (220 °C, 2.0 min, 5 wt % solids loading) performed as well as the dilute acid pretreatment (175 °C, 10.0 min, 0.8% sulfuric acid, 20 wt % solids loading) for fermentation of the cellulosic fraction of the pretreated fibers by simultaneous saccharification and fermentation (SSF), using Saccharomyces cerevisiae and 25 IFPU cellulase/g of cellulose. Ethanol yields of 97 and 92 wt % of the theoretical yield and xylan recoveries of 85 and 70 wt % (92 and 96 wt % solubilization) were achieved with the hot liquid water and dilute acid pretreatments, respectively. Steam pretreatment (220 °C, 2 min) was not as effective as the dilute acid pretreatment, resulting in an ethanol yield of 70 wt % of the theoretical yield, with 88 wt % xylan recovery (54 wt % solubilization). A positive correlation was found between xylan removal and the ethanol yield obtained by SSF. Xylan recovery, however, was inversely proportional to xylan solubilization. Removal of up to 57 wt % of the acid-insoluble lignin in yellow poplar was also possible with hot liquid water pretreatment, with 75 wt % of this acid-insoluble lignin recoverable by simple filtration of the liquid pretreatment products.

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“…Glucose and other sugars can be easily produced by hydrolyzing cellulose and hemicellulose, the primary polysaccharide components of biomass. Various processes are available to hydrolyze biomass to sugars, the most common of which is based on sulfuric acid (Tucker et al, 1997;Grohmann and Torget, 1992;Wright and d'Agincourt 1984). Once available, these sugars can be converted to a host of valuable chemicals by fermentation (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

A Nine-Zone Simulating Moving Bed for the Recovery of Glucose and Xylose from Biomass Hydrolyzate

Wooley

Wang

1998

Ind. Eng. Chem. Res.

127

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A nine-zone simulated moving bed (SMB) process was developed to recover two sugars, glucose and xylose, from biomass hydrolyzate with 88% recovery and near 100% purity. The SMB system consists of two coupled binary SMB rings which are operated at the same switching time. The first ring consists of five zones, in which sulfuric acid (a fast-moving solute) is recovered as the raffinate product, acetic acid (a slow-moving solute) is partially recovered as the extract product, and a mixture of the two sugars (intermediate solute) and the rest of the acetic acid is recovered in a bypass stream, which is input as the feed to the second ring. The second ring consists of four zones, in which the sugars are recovered as the raffinate product and acetic acid is recovered as the extract product. Experimental SMB data obtained using either hydrolyzate or synthetic mixtures of glucose, xylose, sulfuric acid, and acetic acid are presented and analyzed with a lumped mass-transfer model. Single-component and multicomponent pulse tests were used to estimate adsorption and mass-transfer parameters of the four key components present in the hydrolyzate. Simulations based on the estimated parameters were compared with experimental data. Excellent agreement between simulations and experimental data was obtained, indicating that optimization of such a system with a complex feed and more than 19 design parameters can be facilitated with computer simulations.

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Comparison of Yellow Poplar Pretreatment Between NREL Digester and Sunds Hydrolyzer

Cited by 6 publications

References 6 publications

Synthesis and characterization of carboxymethyl cellulose powder and films from Mimosa pigra

Synthesis and characterization of carboxymethyl cellulose powder and films from Mimosa pigra

A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust

A Nine-Zone Simulating Moving Bed for the Recovery of Glucose and Xylose from Biomass Hydrolyzate

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