Batch hydrogenation of high volatile bituminous coal

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Title Batch hydrogenation of high volatile bituminous coal
Publication Type thesis
School or College College of Engineering
Department Chemical Engineering
Author El-Feky, Mahmoud Elewa
Date 1968-05
Description High-volatile bituminous coal was investigated by batch hycjro- genation. Catalyst temperature, pressure, variation of coahoil ratio, and -¦W ¦ T particle size of coal v&ere considered as factors affecting the products dis^ tribution. Kinetic study of batch hydrogenation of a high-volatile Utah bitumi- o o nous coal was considered. The temperature range was from 350 C to 500 C Gaseous, liquid, and solid products were determined. Acidic and basic components of the oil were separated from the distillation fraction boiling 4^ip to 250°C. The neutral oil was fractionated to aromatics, olefins, and satiates. From the six coal samples investigated without adding vehicle oil, the amount of coal converted to oil and gas ranged from 49 .4 percent to 59.1 percent. Conversion yield decreased in the following order: Gerland ^ Rock Spring > Spring Canyon "> Wellington ^ Coal Basin ^ North Thompson Creek. When mixing powdered catalysts with coal, the conversion yield ranged from 24.6 percent to 43.6 percent. The effectiveness of the catalys ¦ •_ decreased in the following order: cobalt molybdate > nickel-tungsten sulfide > iodine. At 450°C and under 1000 psig initial hydrogen pressure, an increase of the catalyst concentration from zero percent to 5.00 percent with respect to coal on ash-free basis, increased the conversion yield xi from 18.8 percent to 58.2 percent. The catalyst is more effective when impregnated on coal in aqueous colution. An, increase of temperature from o o 350 C to 550 C increased the conversion from 19.5 percent to 45.1 percent. An increase of pressure from 500 psig to 1500 psig increased the conversion ¦i. from 46-Y& percent to 61.2 percent. Helium was not as effective as hydrogen in batch hyckogeiiaJtion._..^/yTien-adding vehicle oil to coal, an increase in the oilrcoal ratio from 20:80 to 80:20 increased conversion from 36.4 percent to 73*3 percent. Reduction of the particle size of coal from -35+80 to-400 mesh increased conversion from 44.2 percent to 60.0 percent. The conversion percent as a function of time was determined. Data were considered in terms of simple kinetic equations. In the early stages of hydrogenation, from 350 C to 425 C, a second order rate equation fits the time-yield curves. In the later stages of hydrogenation, the data fit a first order rate equation. From 450QC to 500 C, the entire reaction is second order,. The activation energy was 9.45 kcal/mole for the first order reaction and 38*57 kcal/mole for the second order reaction. A quantitative determination of the products was made. Conversion of coal to liquids and gases ranged from 60.2 percent to 82 .0 percent. Hydrogen consumption increased tsia^a^imra value of 4.05 percent of the coal and vehicle oil and then decreased depending on temperatures and time. Gaseouj hydrocarbons increased steadily from 23.1 percent of the coal and vehicle o ° oil at 350 C to 42 .0 percent at 500 C . They are mainly methane, ethane, propane, and butane. Asphaltene content decreased slightly. Olefins decreased, saturates increased, and aromatics did not change appreciably,
Type Text
Publisher University of Utah
Subject Coal liquefaction
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Relation is Version of Digital reproduction of "Batch hydrogenation of high volatile bituminous coal," J. Willard Marriott Library Special Collections, TP7.5 1968 .F44
Rights Management ©Mahmoud Elewa El-Feky
Format application/pdf
Format Medium application/pdf
Format Extent 9,059,958 bytes
Identifier undthes,5268
Source Original: University of Utah J. Willard Marriott Library Special Collections
Master File Extent 9,059,958 bytes
ARK ark:/87278/s6fx7cbj
Setname ir_etd
ID 191656
Reference URL https://collections.lib.utah.edu/ark:/87278/s6fx7cbj
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