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2 edition of Isothermal pyrolysis of cellulose found in the catalog.

Isothermal pyrolysis of cellulose

A E. Lipska

Isothermal pyrolysis of cellulose

Kinetics and gas chromatographic/mass spectrometric analysis of the degredation products

by A E. Lipska

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  • 16 Currently reading

Published by U. S. Naval Radiological Defense Laboratory .
Written in English


Edition Notes

Statementby A. E. Lipska and F. A. Wodley.
ContributionsWodley, F A.
The Physical Object
Pagination32p.
Number of Pages32
ID Numbers
Open LibraryOL13691196M

Abstract. Pyrolysis of olive oil industry wastes was carried out using stepwise isothermal fast pyrolysis (SIFP). SIFP consists of a succession of isothermal fast pyrolysis reactions in which the solid products obtained from the previous isothermal fast pyrolysis reaction become the substrates for subsequent reactions at higher temperatures.   Bayesian inference was used to test the powdered cellulose pyrolysis, under the isothermal experimental conditions. A completely new procedure that was based on obtaining the reliable distribution functions of the effective (apparent) activation energy (E a) values by the statistical derivation of prior and posterior functions was introduced. It has been found that the pyrolysis of the powdered Cited by: 1.

  Since the s, cellulose pyrolysis has been the subject of intense study, with kinetic analyses forming a major part of these studies. They represent useful tools for a better understanding of the physicochemical process and for the proper design of industrial pyrolysis units. Until recently, the methods most frequently used in these analyses were based on model-fitting, i.e. the fitting of Cited by: Despite the potential for biomass pyrolysis to produce renewable fuels, the governing chemical reactions are largely unknown due to the complexity of biopolymers, such as cellulose. In this work, we use isothermal pyrolysis experiments to reveal the chain length (or end-group) effect that controls the distri.

@article{osti_, title = {Reaction mechanisms in cellulose pyrolysis: a literature review}, author = {Molton, P. M. and Demmitt, T. F.}, abstractNote = {A bibliographic review of references is presented outlining the history of the research into the mechanisms of cellulose pyrolysis. Topics discussed are: initial product identification, mechanism of initial formation of levoglucosan. @article{osti_, title = {Kinetics of biomass and coal pyrolysis}, author = {Agrawal, R K}, abstractNote = {The isothermal pyrolysis of mg samples of cellulose (Whatman CF11), xylan (ex larch wood), lignin (Indulin AT), wood (Ponderosa pine sawdust), newsprint, 1% HCl washed newsprint and lignite (North Dakota) at pressures below 1 torr has been examined.


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Isothermal pyrolysis of cellulose by A E. Lipska Download PDF EPUB FB2

Thermal pyrolysis of cellulose in the range °C. For the present discussion, we chose their results at °C (Figure 1) for two reasons: First, their lowest temperature min imizes un­ certainties due to reaction in the nonisothermal heating period. Second, f or. Isothermal Experiment Cellulose Sample Pure Cellulose Pyrolysis Reaction Classical Procedure These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm by: We would like to show you a description here but the site won’t allow by: The findings on untreated cellulose indicate that: (1) pyrolysis occurs in three distinct phases in the temperature range –°C; (2) there is a single activation energy of 42 kcal/mole over this temperature range; (3) the initial rapid weight loss is not due to the desoprtion of water, but primarily to decomposition of the cellulose; molecules: (4) there is little difference in either the quality or relative Cited by: @article{osti_, title = {Cellulose pyrolysis kinetics: The current state of knowledge}, author = {Antal, Jr, M J and Varhegyi, G}, abstractNote = {Recent advances in experimental methods and computer modeling have shed new light on the kinetics of cellulose pyrolysis.

The rich slate of reaction products that evolve when cellulose is heated implies that the pyrolysis chemistry is. Conclusions. Isothermal pyrolysis kinetics of typical technical solid wastes (polyethylene, paper towel, textile and their mixture) were estimated.

The activation energy of the polyethylene pyrolysis was much higher than that of paper towel and textile. Pyrolysis of cellulose under vacuum and atmospheric pressure gave a tar containing various amounts of 1,6-anhydro-β-D-glucopyranose, 1,6-anhydro-β-D-glucofuranose, α- and β-D-glucose, 3-deoxy-D-erythro-hexosulose, oligo- and polysaccharides, and some dehydration by: “The pyrolysis process of wood biomass samples under isothermal experimental conditions—energy density considerations: Application of the distributed apparent activation energy model with a mixture of distribution functions,” Cellulose 21(4), DOI: /sx.

Estimation of kinetic triplet of cellulose pyrolysis reaction from isothermal kinetic results. Korean Journal of Chemical Engineering23, DOI: /BF Richard Capart, Lotfi Khezami, Alan K. Burnham. Assessment of various kinetic models for the pyrolysis of a microgranular cellulose.

Thermochimica Acta, Cited by: is a platform for academics to share research papers. Isothermal pyrolysis of cellulose untreated and treated with some flame-retardants Hirata, Toshimi; Okamoto, Hajime; Abstract.

Publication: Journal of Polymer Science A Polymer Chemistry. Pub Date: November DOI: /pol Bibcode: JPoSAH Cited by: 3. ISOTHERMAL PYROLYSIS OF CELLULOSE work." Water and levoglucosan follow routes quite different from, the majority of species shown in Figure 6; water decreases while levoglucosan increases with time in the linear region.

Non-isothermal pyrolysis of grape marc: Thermal behavior, kinetics and evolved gas analysis Article in Journal of Thermal Analysis and Calorimetry (2) January with Reads. For example, levoglucosan (the most abundant product of cellulose pyrolysis) yield differs significantly between conventional powder (millimeter-sized samples which are transport-limited) pyrolysis and thin-film (micrometer-scale thin-films which are isothermal) pyrolysis Cited by: The pyrolysis of lignocellulosic materials was studied by multistage isothermal thermogravimetry over a wide range of temperature.

For each material (a hardwood, a softwood and a bark), pyrolysis could be interpreted as the independent thermal degradation of a small Cited by: Isothermal torrefaction kinetics of hemicellulose, cellulose, lignin and xylan using thermogravimetric analysis In recent years, torrefaction, a mild pyrolysis process carried out at the temperature range of – °C, has been considered as an effective route for improving the properties of biomass.

Isothermal pyrolysis of biomass such as rice straw, pelletized corncob and pelletized corn straw are studied with the furnace temperature of degC, degC, degC by macro-thermal gravimetric. Five pseudo-components (hemicellulose, cellulose, lignin, lipid and protein) model with n = 1 or n # 1 was assumed for a kinetic analysis of the collected pyrolysis data.

The model with n # 1 resulted in a slightly better fit quality and reasonable kinetic by: Simulated isothermal TG curves for the pyrolysis of pine bark. At the lowest temperatures considered, the overall reactivity of pine bark is higher (cf.

Table 2). Most certainly, this is a result of its lower content in pseudo-component 2, associated to cellulose (cf. Table 1 Cited by: In this study, the non-isothermal pyrolysis of citrus unshui (C.

unshiu) peel was studied by thermogravimetric analysis (TGA) and evolved gas analysis/pyrolyzer-gas chromatography/mass. Kinetics of Thermal Degradation of Cellulose: Analysis Based on Isothermal and Linear Heating Data In spite of the many studies performed, there is not yet a kinetic model to predict the thermal degradation of cellulose in isothermal and non-isothermal conditions for the full extent of by: 5.Levoglucosan was the major product in the non-catalytic pyrolysis of cellulose.

As for the catalytic pyrolysis of cellulose at C with TiO 2 (in-situ), the peak of levoglucosan disappeared.The BroidoShafizadeh (B-S) scheme is then incorporated into a heat transfer model for thick cellulose pyrolysis.

We do not include separate decomposition mechanisms for lignin, hemicellulose, etc., so this heat-transfer model does not describe wood by: 7.