Solvent extraction of coal with creosote

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Publication Type thesis
School or College College of Engineering
Department Chemical Engineering
Author Gorringe, Ronald E.
Title Solvent extraction of coal with creosote
Date 1959-06
Description This research was conducted to determine the effectiveness of creosote, a coal tar derivative, as a solvent for the extraction of a Utah bituminous coal and to determine the temperature range which produced the highest per cent extraction. Coal,, an amorphous substance of high molecular weight whose molecules are flat polycondensed aromatics differing in molecular structure, molecular weight, iegree of aromaticity, oxygen content, and extent of cross linking, has been studied by means of solvent analysis. With few exceptions, however, it has been possible to identify only those compounds which occur as easily extracted or as absorbed materials- Consequently,, a rigorous analysis of the chemical composition coal through solvent analysis has not been performed. Solvent extraction studies have shown that polycyclic compounds such as lenanthrene are effective extractants for bituminous coal, presumably because their ability to penetrate the micellar structure and dissolve the bitumen-Like dispersion phase. These compounds were found to be effective only above a temperature of 300°C, the plastic temperature of coal.. At this temper attire, the aromatic clusters depolymerize and give the coal a plastic character. The extractions in our research were conducted in a three-liter stainless-beel autoclave. The coal was extracted with the fraction of heavy creosote oil that, at atmospheric pressure, boiled in the range of 300°C to I4.OO C These components were separated from the lower boiling compounds by vacuum distillation at l.Ul psia. The coal was ground to a 20-35-mesh size and was extracted in a. ;olumn which was lined with glass cloth. The column was enclosed in the autoclave. The extract was continuously recirculated for one hour at a constant temperature and at the vapor pressure of the extract. The autoclave was heated with two 7^0-watt Galrod units. After extraction, the previously weighed coal sample was washed with cold benzene, filtered through a glass cloth, dried and weighed for extraction calculation. The creosote had little effect on the coal sample below an extraction temperature of 320°C except for removal of loose colloidal particles» Above 3UO°C, the creosote dissolved 6802 per cent of the coal sample by what appeared to be thermal depolymerization and colloidal suspension, which was evidenced by the small colloidal particles in the extract after each extraction,. High temperature extractions (3kO°C to 35>2GC) yielded phenols, which were evidenced by the dark red color of the utilized extract. A temperature range of 3U0 C to about 36O°C was found to give the best yield, Prom recent literature, the yield of extraction would drop above 360 C. .2-
Type Text
Publisher University of Utah
Subject Bituminous coal; Creosote; Solvents
Dissertation Institution University of Utah
Dissertation Name BS
Language eng
Relation is Version of Digital reproduction of “Solvent extraction of coal with creosote,” J. Willard Marriott Library Special Collections, TP7.5 1959 G63
Rights Management © Ronald E. Gorringe, To comply with copyright, the file for this work may be restricted to The University of Utah campus libraries pending author permission.
Format Medium application/pdf
Format Extent 3,742,579 bytes
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Source Original: University of Utah J. Willard Marriott Library Special Collections,
Master File Extent 3,742,579 bytes
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ID 190979
setname ir_etd
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