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  1. AU="Scott, C. Tim"
  2. AU="Coelho, Luis Francisco Mello(Universidade Estadual Paulista Instituto de Biociências Departamento de Botânica)"
  3. AU="Hesong Zeng"
  4. AU="Babey, Anna-Marie"
  5. AU="Stich, H"
  6. AU=Kuitunen I
  7. AU="Biscaye Pierre E"
  8. AU="Saha, Somen"
  9. AU="Liu, Weihuang"
  10. AU="Nijhuis, Monique"
  11. AU="Ye, Jin-Rong"
  12. AU="Van Not, Hans Pieter"
  13. AU="Liang, Xiao-Hui"
  14. AU="Romano, Raffaella"
  15. AU="Gilles Subra"
  16. AU="Potocnik, Ana"
  17. AU="Butt, Christine"

Suchergebnis

Treffer 1 - 7 von insgesamt 7

Suchoptionen

  1. Artikel: The influence of polymer adsorption, and fiber composition, on the rheology of aqueous suspensions of aspen, cotton, and corn stover pulps

    Samaniuk, Joseph R / Klingenberg, Daniel J / Root, Thatcher W / Scott, C. Tim

    Biomass and bioenergy. 2017 Aug., v. 103

    2017  

    Abstract: The mechanisms governing the ability of water-soluble polymers (WSP) to alter the rheological properties of lignocellulosic biomass to achieve processing advantages are investigated. Lignocellulosic fiber surface chemistry is found to be an important ... ...

    Abstract The mechanisms governing the ability of water-soluble polymers (WSP) to alter the rheological properties of lignocellulosic biomass to achieve processing advantages are investigated. Lignocellulosic fiber surface chemistry is found to be an important factor in the efficacy of WSPs as rheological modifiers, and a strong correlation between the amount of adsorbed polymer at fiber surfaces and the yield stress of the fiber suspension indicate that adsorption of polymer is important for rheological modification. Three fiber suspensions of varying physical chemistry were produced from Aspen wood chips, and a number of additional fiber suspensions with chemically functionalized surfaces were generated from cellulose pulp. Polymer adsorption and suspension rheology are found to correlate in every case examined, but the amount of adsorbed polymer alone cannot be used to predict the efficacy of a WSP as a rheological modifier, suggesting that there are contributions from additional variables such as adsorbed-polymer conformation.
    Schlagwörter adsorption ; biomass ; cellulose ; corn stover ; cotton ; lignocellulose ; polymers ; pulp ; rheological properties ; rheology ; wood chips
    Sprache Englisch
    Erscheinungsverlauf 2017-08
    Umfang p. 47-54.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 1090121-8
    ISSN 0961-9534
    ISSN 0961-9534
    DOI 10.1016/j.biombioe.2017.05.009
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Buch: Beneficial use of pulp and paper industry residuals

    Scott, C. Tim

    extrusion for the manufacture of building panels

    (Technical bulletin ; no. 814)

    2000  

    Körperschaft National Council for Air and Stream Improvement
    Verfasserangabe by C. Tim Scott [and others]
    Serientitel Technical bulletin ; no. 814
    Schlagwörter Waste paper/Recycling/Environmental aspects. ; Effluent quality. ; Wood-pulp industry/Waste disposal. ; Paper industry/Waste disposal.
    Sprache Englisch
    Umfang 1 volume (various pagings) :, illustrations ;, 28 cm.
    Verlag National Council for Air and Stream Improvement
    Erscheinungsort Research Triangle Park, NC
    Dokumenttyp Buch
    Anmerkung "October 2000."
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel: Comparison of Dilute Acid and Sulfite Pretreatment for Enzymatic Saccharification of Earlywood and Latewood of Douglas fir

    Zhang, Chao / Lei, Xiaochun / Scott, C. Tim / Zhu, J.Y / Li, Kecheng

    BioEnergy research. 2014 Mar., v. 7, no. 1

    2014  

    Abstract: This study applied dilute acid (DA) and sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) to deconstruct earlywood and latewood cell walls of Douglas fir for fermentable sugars production through subsequent enzymatic ... ...

    Abstract This study applied dilute acid (DA) and sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) to deconstruct earlywood and latewood cell walls of Douglas fir for fermentable sugars production through subsequent enzymatic hydrolysis. DA pretreatment removed almost all the hemicelluloses, while SPORL at initial pH = 4.5 (SP-B) removed significant amount of lignin between 20 and 25� %. But both are not sufficient for effective enzymatic saccharification. SPORL at low initial pH = 2 (SP-AB) combines the advantage of both DA and SPORL-B to achieve approximately 90� % hemicellulose removal and delignification of 10–20� %. As a result, SP-AB effectively removed recalcitrance and thereby significantly improved enzymatic saccharification compared with DA and SP-B. Results also showed that earlywood with significantly lower density produced less saccharification after DA pretreatment, suggesting that wood density does not contribute to recalcitrance. The thick cell wall of latewood did not limit chemical penetration in pretreatments. The high lignin content of earlywood limited the effectiveness of DA pretreatment for enzymatic saccharification, while hemicellulose limits the effectiveness of high pH pretreatment of SP-B. The higher hemicellulose content in the earlywood and latewood of heartwood reduced saccharification relative to the corresponding earlywood and latewood in the sapwood using DA and SP-AB.
    Schlagwörter Pseudotsuga menziesii ; cell walls ; delignification ; earlywood ; enzymatic hydrolysis ; heartwood ; hemicellulose ; latewood ; lignin ; pH ; saccharification ; sapwood ; sugars ; wood density
    Sprache Englisch
    Erscheinungsverlauf 2014-03
    Umfang p. 362-370.
    Erscheinungsort Springer-Verlag
    Dokumenttyp Artikel
    ZDB-ID 2424546-X
    ISSN 1939-1242 ; 1939-1234
    ISSN (online) 1939-1242
    ISSN 1939-1234
    DOI 10.1007/s12155-013-9376-6
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel: Rheometry of coarse biomass at high temperature and pressure

    Klingenberg, Daniel J / Bourne, Keith J / Burlawar, Shalaka / Gleisner, Roland / Houtman, Carl / Root, Thatcher W / Scott, C. Tim / Subramaniam, Vish

    Elsevier Ltd Biomass and bioenergy. 2017 Apr., v. 99

    2017  

    Abstract: We designed, constructed, and tested a new device that can measure the rheological properties of lignocellulosic biomass slurries with high solids concentrations (>25%) containing large particles (>10 mm), and that can operate at high temperatures (>230 ° ...

    Abstract We designed, constructed, and tested a new device that can measure the rheological properties of lignocellulosic biomass slurries with high solids concentrations (>25%) containing large particles (>10 mm), and that can operate at high temperatures (>230 °C), high pressures (>2.8 MPa), and low pH (<1.0). Rheological properties measured with this Lignocellulosic Biomass Rheometer (LCBR) are consistent with those measured with another instrument. Biomass samples investigated are yield stress materials, consistent with previous reports. For modest temperatures, the viscosity decreases reversibly with increasing temperature. When the biomass is exposed to sufficiently high temperature and low pH, we observe an irreversible decrease in apparent viscosity, consistent with that expected as hydrolysis reactions reduce the concentration of insoluble solids.
    Schlagwörter biomass ; hydrolysis ; lignocellulose ; pH ; rheometers ; rheometry ; slurries ; temperature ; viscosity
    Sprache Englisch
    Erscheinungsverlauf 2017-04
    Umfang p. 69-78.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 1090121-8
    ISSN 0961-9534
    ISSN 0961-9534
    DOI 10.1016/j.biombioe.2017.01.031
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel ; Online: The effect of high intensity mixing on the enzymatic hydrolysis of concentrated cellulose fiber suspensions.

    Samaniuk, Joseph R / Scott, C Tim / Root, Thatcher W / Klingenberg, Daniel J

    Bioresource technology

    2011  Band 102, Heft 6, Seite(n) 4489–4494

    Abstract: Enzymatic hydrolysis of lignocellulosic biomass in a high shear environment was examined. The conversion of cellulose to glucose in samples mixed in a torque rheometer producing shear flows similar to those found in twin screw extruders was greater than ... ...

    Abstract Enzymatic hydrolysis of lignocellulosic biomass in a high shear environment was examined. The conversion of cellulose to glucose in samples mixed in a torque rheometer producing shear flows similar to those found in twin screw extruders was greater than that of unmixed samples. In addition, there is a synergistic effect of mixing and enzymatic hydrolysis; mixing increases the rate of cellulose conversion while the increased conversion facilitates mixing. The synergy appears to result in part from particle size reduction, which is more significant when hydrolysis occurs during intense mixing.
    Mesh-Begriff(e) Acids ; Biomass ; Cellulase/metabolism ; Cellulose/metabolism ; Enzyme Stability ; Hydrolysis ; Models, Biological ; Suspensions ; Time Factors ; Torque ; Waste Products ; Zea mays/chemistry
    Chemische Substanzen Acids ; Suspensions ; Waste Products ; Cellulose (9004-34-6) ; Cellulase (EC 3.2.1.4)
    Sprache Englisch
    Erscheinungsdatum 2011-03
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2010.11.117
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel: Rheology measurements of a biomass slurry: an inter-laboratory study

    Stickel, Jonathan J / Knutsen, Jeffrey S / Liberatore, Matthew W / Luu, Wing / Bousfield, Douglas W / Klingenberg, Daniel J / Scott, C. Tim / Root, Thatcher W / Ehrhardt, Max R / Monz, Thomas O

    Rheologica acta. 2009 Dec., v. 48, no. 9

    2009  

    Abstract: The conversion of biomass, specifically lignocellulosic biomass, into fuels and chemicals has recently gained national attention as an alternative to the use of fossil fuels. Increasing the concentration of the biomass solids during biochemical ... ...

    Abstract The conversion of biomass, specifically lignocellulosic biomass, into fuels and chemicals has recently gained national attention as an alternative to the use of fossil fuels. Increasing the concentration of the biomass solids during biochemical conversion has a large potential to reduce production costs. These concentrated biomass slurries have highly viscous, non-Newtonian behavior that poses several technical challenges to the conversion process. A collaborative effort to measure the rheology of a biomass slurry at four separate laboratories has been undertaken. A comprehensive set of rheological properties were measured using several different rheometers, flow geometries, and experimental methods. The tendency for settling, water evaporation, and wall slip required special care when performing the experiments. The rheological properties were measured at different concentrations up to 30% insoluble solids by mass. The slurry was found to be strongly shear-thinning, to be viscoelastic, and to have a significant concentration-dependent yield stress. The elastic modulus was found to be almost an order of magnitude larger than the loss modulus and weakly dependent on frequency. The techniques and results of this work will be useful to characterize other biomass slurries and in the design of biochemical conversion processing steps that operate at high solids concentrations.
    Schlagwörter biomass ; rheological properties ; rheology ; lignocellulose ; physicochemical properties
    Sprache Englisch
    Erscheinungsverlauf 2009-12
    Umfang p. 1005-1015.
    Dokumenttyp Artikel
    ZDB-ID 1463993-2
    ISSN 1435-1528 ; 0035-4511
    ISSN (online) 1435-1528
    ISSN 0035-4511
    DOI 10.1007/s00397-009-0382-8
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel: Comparison of Dilute Acid and Sulfite Pretreatment for Enzymatic Saccharification of Earlywood and Latewood of Douglas fir

    Zhang, Chao / Lei, Xiaochun / Scott, C. Tim / Zhu, J.Y. / Li, Kecheng

    BioEnergy research

    Band v. 7,, Heft no. 1

    Abstract: This study applied dilute acid (DA) and sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) to deconstruct earlywood and latewood cell walls of Douglas fir for fermentable sugars production through subsequent enzymatic ... ...

    Abstract This study applied dilute acid (DA) and sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) to deconstruct earlywood and latewood cell walls of Douglas fir for fermentable sugars production through subsequent enzymatic hydrolysis. DA pretreatment removed almost all the hemicelluloses, while SPORL at initial pH = 4.5 (SP-B) removed significant amount of lignin between 20 and 25� %. But both are not sufficient for effective enzymatic saccharification. SPORL at low initial pH = 2 (SP-AB) combines the advantage of both DA and SPORL-B to achieve approximately 90� % hemicellulose removal and delignification of 10–20� %. As a result, SP-AB effectively removed recalcitrance and thereby significantly improved enzymatic saccharification compared with DA and SP-B. Results also showed that earlywood with significantly lower density produced less saccharification after DA pretreatment, suggesting that wood density does not contribute to recalcitrance. The thick cell wall of latewood did not limit chemical penetration in pretreatments. The high lignin content of earlywood limited the effectiveness of DA pretreatment for enzymatic saccharification, while hemicellulose limits the effectiveness of high pH pretreatment of SP-B. The higher hemicellulose content in the earlywood and latewood of heartwood reduced saccharification relative to the corresponding earlywood and latewood in the sapwood using DA and SP-AB.
    Schlagwörter lignin ; cell walls ; earlywood ; hemicellulose ; sugars ; delignification ; enzymatic hydrolysis ; sapwood ; wood density ; heartwood ; Pseudotsuga menziesii ; latewood ; saccharification ; pH
    Sprache Englisch
    Dokumenttyp Artikel
    ISSN 1939-1234
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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