Showing papers on "Carbochemistry published in 1997"
TL;DR: In this paper, a fluidized bed system was used to pyrolyse and partly gasify five coals ranging in volatile matter from 35 to 45 wt% from analysis of the original coals and the chars and tars produced.
28 citations
TL;DR: A series of polycyclic aromatic hydrocarbons (PAHs) and diphenylalkane-containing phenolic co-resites have been prepared using phenol as mentioned in this paper.
Abstract: To probe the formation of polycyclic aromatic hydrocarbons (PAHs) during the carbonization, gasification, and liquefaction of coals and other solid fuels, nonsoftening phenol—formaldehyde (PF) co-resites are ideal since they facilitate the incorporation of individual PAHs into a highly crosslinked matrix. A series of PAH and diphenylalkane-containing phenolic co-resites have been prepared using phenol with, as the second component, 2-naphthol, 4-hydroxy diphenylmethane, 4,4′-dihydroxydiphenylethane, 1-(4-hydroxybenzyl)naphthalene, 9-(4-hydroxybenzyl)anthracene, and 9-(4-hydroxybenzyl)phenanthrene. A mole ratio of 3 : 1 (phenol : second phenolic constituent) was adopted to ensure that a reasonably high degree of crosslinking was achieved. The virtually complete elimination of ether and methylol functions from the resoles by curing at 200°C was monitored by solid-state 13C-NMR. The resites were also characterized by Fourier transform infrared spectroscopy. The volatile-matter contents of the PAH-containing resites were all higher than that of the normal resite. The carbonization of the 9-(4-hydroxybenzyl)anthracene-containing resite in a fluidized-bed reactor is used to illustrate the potential applications of the PAH-containing resites in fuel science. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 663–671, 1997
11 citations
01 Apr 1997
TL;DR: In this article, the authors examined the properties of Argonne coals by temperature resolved high resolution mass spectrometry and found evidence that strong bond cleavage may be very important for volatile release in pyrolysis of higher rank coals.
Abstract: The objective of this study is to elucidate the nature of the important linkages between aromatic clusters and variations of these links with coal rank. From studies using methods such as NMR and mass spectrometry, the authors have considerable information on the size and types of aromatic clusters in the Argonne coals. In this study, extracts, model polymers, extracted coals, and modified coals are examined by temperature resolved high resolution mass spectrometry. There is evidence that strong bond cleavage may be very important for volatile release in pyrolysis of higher rank coals.