Record Display for the EPA National Library Catalog

RECORD NUMBER: 20 OF 23

OLS Field Name OLS Field Data
Main Title Surface phenomena in the dewatering of coal /
Author Keller, D. V. ; Keller, Jr., D. V. ; Stelma, G. J. ; Chi, Y. M.
Other Authors
Author Title of a Work
Stelma, G. J.
Chi, Y. M.
CORP Author Syracuse Univ., NY. Dept. of Chemical Engineering and Materials Science.;Department of Energy.
Publisher The Division ; U.S. Environmental Protection Agency, Office of Research and Development, Industrial Environmental Research Laboratory ; National Technical Information Service [distributor],
Year Published 1979
Report Number EPA-600/7-79-008; FE-9001-1; ET-75-G-01-9001
Stock Number FE-9001-1
OCLC Number 08482802
Subjects Coal. ; Surface active agents.
Additional Subjects Coal ; Coal fines ; Surfactants ; Adsorption ; Drying ; Experimental data ; Graphs ; Sorptive properties ; Tables ; Water removal ; ERDA/013000
Internet Access
Description Access URL
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9101E2N2.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EJBD ARCHIVE EPA 600-7-79-008 Headquarters Library/Washington,DC 07/03/2013
EJBD  EPA 600-7-79-008 Headquarters Library/Washington,DC 03/22/2016
EKAM  FE-9001-1 Region 4 Library/Atlanta,GA 08/19/1994
EKBD  EPA-600/7-79-008 Research Triangle Park Library/RTP, NC 08/25/2000
ESAD  EPA 600-7-79-008 Region 10 Library/Seattle,WA 03/23/2010
NTIS  FE-9001-1 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation xiii, 169 pages : illustrations ; 28 cm.
Abstract
The influence of certain surfactants on the dewatering of fine coal has been investigated. The surfactants investigated were found to have a two-fold effect. They were found to effect the pressure differentials required for dewatering in addition to the residual water contents of the coal beds attainable by this dewatering. Both effects were attributed to surfactant adsorption. Adsorption at the liquid-air interface resulted in a decrease in the interfacial tension between the two phases. The effect this decrease had on the pressure differentials required for dewatering was found to be in agreement with that predicted by the capillary theory applied to the system. Adsorption at the solid-liquid interface was correlated with the complex behavior of the residual water contents as a function of surfactant addition. A comprehensive model for the adsorption of the surfactants onto the coal was presented, based on the Stern--Grahame theory of adsorption at an electrical double layer. The model allowed for the mode of physisorption to change as the amount of surfactant adsorbed increased, and also for a phenomenon known as hemi-micellation. Using the model, consistent and reasonable results were found for the specific surface area of the coal and for the standard free energies of adsorption. The model was also found to be appropriate when the heterogeneous nature of the coal was considered. Furthermore, the hydrophobicity of the molecular groups of the molecules, expected from the model to be controlling the hydrophobicity of the interface, was found to be in agreement with that predicted by other means. (ERA citation 04:052524)
Notes
"Final report"--Added title page. "Syracuse University, Department of Chemical Engineering and Material Science." "January 1979." "October 1, 1978"--Added title page. Includes bibliographical references. "EPA/DoE interagency agreement no. DXE685AK, program element no. EHE623A." "Contract no. ET-75-G-01-9001"--Added title page. "MTS-6707-DK-FR-1078"--Added title page. "FE-9001-1."