Results 111 to 120 of about 743 (161)

Chemicals from wood: Prehydrolysis/organosolv methods

Bioresource Technology, 1989
The results of water hydrolysis of southern yellow pine and SO2 hydrolysis of southern hardwood mixtures are presented. A unified processing system of prehydrolysis and organosolv delignification is recommended on the basis of the above results and the results of organosolv-ethanol, EDA-EtOH-AQ and acid-catalyzed ethanol delignification systems on both
R. Aravamuthan, W. Chen, K. Zargarian, G. April   +3 more
exaly   +2 more sources

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
openaire   +2 more sources

Characteristics of prehydrolysis-kraft pulp fibers from Scots pine

Holzforschung, 2012
Abstract To clarify the influence of prehydrolysis on fiber characteristics, Scots pine (Pinus sylvestris L.) wood chips were subjected to pressurized hot-water and dilute-acid prehydrolysis (0.5% H2SO4) prior to kraft pulping to partially remove hemicelluloses as hydrolyzate.
Kaj Backfolk
exaly   +2 more sources

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
openaire   +2 more sources

Fractionation of wheat straw by prehydrolysis, organosolv delignification and enzymatic hydrolysis for production of sugars and lignin

Bioresource Technology, 2012
-Wheat straw was fractionated using a three-step biorefining approach: (1) aqueous pretreatment for hemicellulose prehydrolysis into sugars, (2) organosolv delignification, and (3) enzymatic cellulose hydrolysis into glucose. Prehydrolysis was applied to
Wild, P.J. de, Uil, H. den, Smit, A.T., Huijgen, W.J.J.   +3 more
exaly   +1 more source

Prehydrolysis Sulfite Revisited

Macromolecular Symposia, 2005
AbstractThe prehydrolysis of beech wood in water at different temperatures and the impact of this treatment on further pulping stages were explored. Both, increased condensation degree and an increased number of free phenolic hydroxyl groups were found in the lignin isolated after prehydrolysis. An intermediate alkaline extraction (using either NaOH or
Mario Fasching, Andreas Griebl, Gottfried Kandioller, Andrea Zieher, Hedda Weber, Herbert Sixta   +5 more
openaire   +1 more source

Improvements in the methanolysis of pectins by enzymic prehydrolysis

Carbohydrate Research, 1989
In order to improve the methanolysis of pectins, enzymic prehydrolysis was carried out. The methyl glycosides released were analyzed by h.p.l.c. The results were compared with those obtained by methanolysis with M HCl in methanol, and H 2 SO 4 in methanol by colorimetric determination of the content of galacturonic acid, as well as by g.l.c.
Quéméner, Bernard, Thibault, J.F., Brunet, C., Crépeau, M.J.   +3 more
openaire   +2 more sources

Modelling of biomass fractionation by prehydrolysis-delignification

Chemical Engineering Science, 1988
Abstract A two-stage process is investigated as a potential fractionation method for barley straw biomass. Modeling of dilute-acid prehydrolysis shows that hemicellulose saccharification rate is controlled by chemical reaction; in the case of delignification of the prehydrolyzed residue by high-consistency clorination, the rate-controlling step is ...
Gy. Marton, M. Kovacs, V. Oreopoulou, E.G. Koukios   +3 more
openaire   +1 more source

Control Strategy Scheme for the Prehydrolysis Kraft Process

Computer Aided Chemical Engineering, 2018
Abstract This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process.
Sixta Herbert, Lahnalammi Antton, Jämsä-Jounela Sirkka-Liisa   +2 more
openaire   +2 more sources

Optimizing Hardwood Prehydrolysis for Simultaneous Production of Bioproducts and Biomaterials

Journal of Bioprocess Engineering and Biorefinery, 2012
Theodore Radiotis, Xiao Zhang, Michael Paice, Vince Byrne   +3 more
exaly   +2 more sources