Clean Utilization of Coal: Coal Structure and Reactivity, by J. W. Larsen (auth.), Yuda Yürüm (eds.)

By J. W. Larsen (auth.), Yuda Yürüm (eds.)

This quantity includes the lectures offered on the complex research Institute on "Chemistry and Chemical Engineering of Catalytic strong gas Conversion for the creation of aean artificial Fuels" which used to be held at Ak~;ay, Edremit, Tiirkiye, among July 21 and August three, 1991. The e-book comprises 23 chapters initially written for the assembly by means of amazing scientists an technologists within the box. l want to recognize the contribution of every of the authors within the e-book. Their efforts have make clear our realizing in coal technological know-how examine and higher usage of coal. 3 major matters: constitution and reactivity of coal; cleansing of coal and its items, and elements affecting environmental stability of strength utilization and suggestions for destiny, have been mentioned within the Institute and those are awarded lower than six teams within the booklet. i'm hoping that of serious use to investigate staff from educational and business historical past. the ebook might be many of us contributed to the good fortune of the Institute on which this quantity was once dependent. I take this get together to thank my colleagues who lectured within the Institute, either for his or her efforts throughout the weeks and their expertly ready lecture notes that reached to me in time. The Institute used to be generously subsidized by means of the medical and Environmental Affairs Dh·ision of the NATO and their contribution is deeply acknowledged.

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Additional info for Clean Utilization of Coal: Coal Structure and Reactivity, Cleaning and Environmental Aspects

Example text

Tables 7 and 8 show that at 400 and 450°C liquefaction yields became substantial and increased significantly as the duration of the experiment was increased from 100 to 400 seconds. It is often observed that, under mild conditions, liptinites give lower conversions than vitrinites, whilst at 450°C and hold times of 400 seconds conversions are comparable. In other words liptinites do not appear to solubilise as rapidly as vitrinites and their activation energy for liquefaction appears to be higher (20).

C. SOOC where the solvent is not appreciably changed. d. Extractive chemical disintegration at temperatures exceeding 4QOOC where the solvent becomes a reactant in the process. Berkowitz (2) has differentiated between various extraction regimes as: a. Extraction at or below the boiling point b. 500C at autogenic solvent pressures) c. Extraction near 4000C when thermal decomposition, solvolysis, and hydrogenation reactions are combined. Here solvolysis is defined as any coal-solvent interaction at "conditions that are more severe than conventional Soxhlet extraction, but do not simultaneously promote incipient 'active' thermal decomposition of the coal".

This results in a diminution of the tar yield and a simplification of the chemical structures present in the tar. The high temperature tars, like coke oven tars, contain polynuclear aromatics, the low temperature tars having become dealkylated and alkanes having cracked, as have such reactive compounds as polyhydric phenols. The role of the second "cracking" Gray-King furnace introduces the concept of secondary reactions which are "retrogressive in the sense that they may counter the primary reactions of pyrolysis and reduce yields of liquid products.

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