Results 181 to 190 of about 2,681 (225)

The Role of Prehydrolysis in the Preparation of Zirconia—Silica Aerogels

1996
Prehydrolysis of an 'unreactive' precursor, typically a silicon alkoxide, has long been used to promote homogeneous mixing in sol-gel syntheses of mixed oxides. Studies of single oxide preparations teach that sol-gel parameters, partiularly water concentration, have a profound effect on product properties.
James B. Miller, Edmond I. Ko
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Influence of acid prehydrolysis on the process of wood oxidation into vanillin and pulp

Journal of Wood Chemistry and Technology, 2020
The influence of pine wood (Pinus Sylvestris) prehydrolysis on the consumption of main reagents (O2 and NaOH) in the subsequent catalyzed oxidation of the obtained lignocelluloses into vanillin and...
Valery E. Tarabanko, Konstantin L. Kaygorodov, Dmitry O. Vigul, Nikolay Tarabanko, Yulia V. Chelbina, Marina A. Smirnova   +5 more
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Improving the adsorption of lignocelluloses of prehydrolysis liquor on precipitated calcium carbonate

Carbohydrate Polymers, 2013
In this work, the adsorption of lignocelluloses of pre-hydrolysis liquor (PHL) on precipitated calcium carbonate (PCC) was studied in the presence of poly diallyldimethylammonium chloride (PDADMAC) or cationic polyacrylamide (CPAM). The results revealed that adding PCC to PHL and subsequently adding cationic polymers to PHL/PCC systems was more ...
Pedram, Fatehi, Jing, Shen, Fadia C, Hamdan, Yonghao, Ni   +3 more
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SO2-catalysed prehydrolysis of coniferous wood for ethanol production

Biotechnology Letters, 1986
This paper reports studies of large scale, 1500 kg/h, SO2-catalysed prehydrolysis of coniferous wood chips, samples then being hydrolyzed by a wood-saccharifying enzyme system followed by fermentation to ethanol in the laboratory. Hemicellulose hydrolysis using SO2 catalyst (prehydrolysis) was found to be more effective than steam alone (autohydrolysis)
Morris Wayman, Sarad Parekh, Esteban Chornet, Ralph P. Overend   +3 more
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Saccharification of douglas‐fir wood by a combination of prehydrolysis and pyrolysis

Journal of Applied Polymer Science, 1982
AbstractA process has been investigated for the saccharification of wood, involving prehydrolysis, lignocellulose pyrolysis, and tar hydrolysis. In this process, ground wood was first prehydrolyzed to remove the more readily hydrolyzable hemicelluloses.
Fred Shafizadeh, Thomas T. Stevenson
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The recycle of sulfuric acid and xylose in the prehydrolysis of corn stover

Energy, 1982
Abstract Ethanol may be produced from agricultural residues by using a two-stage acid hydrolysis followed by acid recovery, fermentation, and distillation. With sulfuric acid as a catalyst, xylose-rich and glucose-rich streams can be obtained from corn stover in the prehydrolysis and hydrolysis steps, respectively.
Richard A. Baltz, Andy F. Burcham, Oliver C. Sitton, Neil L. Book   +3 more
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Prehydrolysis in Softwood Pulping Produces a Valuable Biorefinery Fraction for Material Utilization

Environmental Science & Technology, 2012
A scaled-up prehydrolysis process was elaborated to demonstrate an industrially feasible operation step in a pulping process that generates a valuable side product in addition to the cellulose pulp. The valuable side product is aqueous process liquor, a softwood hydrolysate (SWH) herein produced in 60 L batches, and its components were recovered and ...
Soheil, Saadatmand, Ulrica, Edlund, Ann-Christine, Albertsson, Sverker, Danielsson, Olof, Dahlman   +4 more
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Effect of Prehydrolysis on the Textural and Catalytic Properties of Titania-Silica Aerogels

MRS Proceedings, 1994
ABSTRACTA sol-gel based preparation of a mixed oxide allows considerable control over the extent of component mixing. When the reactivities of the alkoxide precursors are evenly matched, a homogeneously mixed sample can be produced; a large reactivity difference results in a segregated mixed oxide product. We have prepared and characterized two sets of
J.B. Miller, S.T. Johnston, E.I. Ko
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SO2 prehydrolysis for high yield ethanol production from biomass

Applied Biochemistry and Biotechnology, 1988
The advantages of the use of SO2 in steam pretreatment are described. Two different large scale continuous reactors, the Stake and the Wenger, have been used for this purpose. Pine, aspen and corn stover were prehydrolysed by SO2 in these reactors and hydrolysed by enzymes.
Morris Wayman, Sarad R. Parekh
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Common aspects of acid prehydrolysis and steam explosion for pretreating wood

Bioresource Technology, 1991
Abstract The initial rate of hydrolysis using cellulase from Trichoderma reesei for various wood samples is directly proportional to the surface area available to the enzyme. Both dilute acid hydrolysis in a continuous flow reactor or autohydrolysis in a steam exploder are similar pretreatment methods in that they increase the pore volume of the ...
Hans E. Grethlein, Alvin O. Converse
openaire   +1 more source