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Prediction of the Behaviour of Biomass Ash in Fluidized Bed Combustors and Gasifiers (1999)

Arvelakis, S. ; Sotiriou, C. ; Moutsatsou, A. ; [et al.]

Springer

Journal of thermal analysis and calorimetry 56 (1999), S. 1271-1278

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ISSN: 1572-8943

Keywords: agricultural residues ; combustion ; gasification ; pretreatment ; thermal analysis techniques

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Two types of agricultural residues (wheat straw and olive residue) in untreated and pretreated (fractionation, leaching) form were tested as concerns their ash melting behaviour during fluidized bed combustion and gasification by means of thermal analysis techniques. The techniques applied included DSC, simultaneous DSC/TG and TG-MS for the determination of low-temperature ash melts and losses caused by the volatilization of alkali material. In combination with ash elemental analyses on the materials, the applied techniques proved to offer valuable information for prediction of the ash behaviour in fluidized bed reactors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1010189919655

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Correlating the effect of pretreatment on the enzymatic hydrolysis of straw (1992)

Koullas, D. P. ; Christakopoulos, P. ; Kekos, D. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 39 (1992), S. 113-116

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ISSN: 0006-3592

Keywords: enzymic hydrolysis models ; pretreated lignocellulosics hydrolysis ; Fusarium oxysporum cellulases ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Avicell, Alkali-treated straw cellulose (ATSC), and wheat straw were ball-milled to reduce crystallinity; wheat straw was delignified by hot (120°C) sodium hydroxide solutions of various concentrations. The physically and chemically pretreated cellulosic materials were hydrolyzed by the cellulases of Fusarium oxysporum strain F3. Enzymic hydrolysis data were fitted by the hyperbolic correlation of Holtzapple, which involves two kinetic parameters, the maximum conversion (Xmax), and the enzymic hydrolysis time corresponding to 50% of Xmax (t1/2). An empirical correlation between Xmax and cellulose crystallinity, lignin content, and degree of delignification has been found under our experimental conditions. Complete cellulose hydrolysis is shown to be possible at less than 60% crystallinity indices or less than 10% lignin content.

Additional Material: 3 Ill.