Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains xvi, 182 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 98-100).

Thesis (Ph. D.)--Lehigh University, 1996. / Degree awarded in October 1996. Two separate papers. Includes vita. Bibliography: leaves 45-47; 130-133.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 242-254). Also available via the Internet.

Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains viii, 134 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 119-120).

Thesis (M.S.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains xiii, 131 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 118-120).

The paper discusses a two-step process for the simultaneous extraction of graphene quantum dots and chemicals. The two steps are sequential structure disruption by supercritical CO2 explosion followed by a low temperature (120oC), non-catalytic transfer hydrogenation in supercritical CO2. The key idea of this research is, one hydrogen atom from hydrogen transfer agent (HTA) one hydrogen atom from water is used to hydrogenate the coal. The use of supercritical CO2 enhances the rate of hydrogenation, helps in dissolution of non-polar molecules and removal from the reaction site. The coal dissolution products are polar and non-polar. A phase transfer agent (PTA) allows seamless transport of the ions and byproduct between the aqueous and organic phases. A polar modifier (PM) for CO2 has been added to aid in the dissolution and removal of the polar components. The effect of feed conditions on the liquefaction process has been investigated. The response metrics considered were the conversion of coal and the yields of various organic classes such as ketones, alkanes, alkenes, aliphatic acids, alcohols, amines, aromatics and aromatic oxygenates. Ketones were found to be the major constituent of the products. Graphene quantum dots were also extracted.

A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg, 1992 / Modern methods of mechanised mining and the necessity for the utilization of total reserves have caused the inclusion of more and more impurities in run of mine coal. This fact, together with the limited supply of naturally clean coal fCI gasification, liquefaction and metallurgical purposes, has made some Iorm l){ beneficiation obligatory at many mines not only in South Africa but also in many other countries. One of the South African Coalfields, Waterherg, contains the continent's largest reserves (approximately 46% of South African known reserves). At the Grootegeluk Coal Mine, approximately 15 m tons of coal per annum are mined by opencast methods. The coal is characterised by containing a high proportion of reactive macerals. The Waterberg Coalfield is currently supplying coal for coke manufacture and middlings for power generation. This coal could also be used for other markets, as Waterberg coal is low in oxygen, contains up to 30% volatile matter. Because it contains 90% vitrinite, it is suitable for direct liquefaction, and possibly coal-water mixtures. However the yield of coal suitable for coking or liquefaction (approx 10% ash) is only 12%, with another 24% of 35% ash coal, currently used for power generation. These yields render mining generally uneconomical if making a simple product. The objective of this project is to ascertain whether the yields of washed coal from the Waterberg Coalfield might be increased by using comminution. Thereafter appropriate beneficiation techniques might be employed on different size fractions. Liberation, float and sink, froth flotation and oil agglomeration processes were examined to identify the best way of treating the coal. Work was carried out on the existing clean coal, middlings and discard fractions. The major objective was to optimise the yield of 10-15% ash coal.The results of the experiment indicate that it is possible to obtain low ash coal from middlings, and middlings from discard for power station. The capital and operating costs for improved new plants are calculated by using available factorised data. The results of experiments on both middlings and discards indicate that yields are significantly higher than those currently obtained, but the cost of obtaining such enhanced yields can be too high for normal commercial application. / MT2017

Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains xiii, 122 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 100-103).

Thesis (M. Sc.)--University of Alberta, 2009. / Title from pdf file main screen (viewed on Dec. 14, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering, Department of Chemical and Materials Engineering, University of Alberta." Includes bibliographical references.

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