Journal ArticleDOI
Mass transfer limitations in coal liquefaction
B. Özüm,S. Parkash,S. Chakrabartty,M. N. Ogˇluztöreli +3 more
- Vol. 3, Iss: 2, pp 229-249
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TLDR
In this paper, the solvent diffusion effect on solvolysis of vitrinitic macerals in Alberta subbituminous coal has been studied, by performing petrographlc analyses of original coal and liquefaction residues.Abstract:
In a number of contributions to coal liquefaction, gas–liquid mass transfer limitation has been referred by neglecting mass transfer limitation of solvent Into solid coal. Reported apparent activation energies of coal liquefaction reactions are In the range of 10–20 kCal/g–mole, which are too low for thermal reactions, Imply that diffusion Is the rate controlling step. In this study, the solvent diffusion effect on solvolysis of vitrinitic macerals In Alberta subbituminous coal has been studied, by performing petrographlc analyses of original coal and liquefaction residues. Quasi–steady state and transient coal–solvent diffusion-chemical reaction models are developed to Interpret the experimental data. Results indicate that solvent diffusion into the reactive maceral most likely be a rate limiting step In coal liquefaction.read more
Citations
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Journal ArticleDOI
Succession patterns in algal turf vegetation on a Caribbean coral reef
TL;DR: Overall, the study provides insight into the early successional stages of coral reef vegetation by identifying the key species and discussing possible factors determining reef development in relation to environmental change.
Journal ArticleDOI
Characterisation of organic coal structure for liquefaction
TL;DR: In this article, the behavior of coals in direct liquefaction to compositional properties is reviewed and correlations with sulphur, reactive maceral and volatile matter contents, vitrinite reflectance and H/C ratios are established for coals from particular geological regions.
Dissertation
Biodegradation of aliphatic and polycyclic aromatic hydrocarbons in petroleum oil-contaminated soils
TL;DR: In this article, the effects of the presence and concentration of co-contaminants, the presence of HP-beta-CD, and prescribed fire on microbial catabolic activity in soils were investigated.
References
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Book
A Course of Modern Analysis
TL;DR: The volume now gives a somewhat exhaustive account of the various ramifications of the subject, which are set out in an attractive manner and should become indispensable, not only as a textbook for advanced students, but as a work of reference to those whose aim is to extend the knowledge of analysis.
Book
Tables of Laplace Transforms
Fritz Oberhettinger,Larry Badii +1 more
TL;DR: Inverse Laplace Transforms and Inverse Trigonometric Functions as mentioned in this paper have also been used to generate generalized hypergeometric functions, such as the generalized generalized Hypergeometric function (GHEF).
Journal ArticleDOI
Liquefaction of coal in hydrogen-donor and non-donor vehicles
TL;DR: In this article, coal was converted to benzene-soluble, liquid products through a reaction path which appears to involve thermal cleavage of chemical bonds in the coal (so-called depolymerization), and free radicals formed pyrolytically were stabilized in the early stages by autogenous hydrogen transfer, and in later stages by abstraction of hydrogen from the hydrogen-donating tetralin.
Book
Introduction to the Theory of Fourier's Series and Integrals
TL;DR: Carlaw's theory of Fourier's series and integrals as mentioned in this paper is a well-known work on the theory of series and integral analysis, and it is of this work that the present book is the new edition.