| 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 |
|
| 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 |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EJBD |
EPA 600-7-79-008 |
|
Headquarters Library/Washington,DC |
03/22/2016 |
| EKBD |
EPA-600/7-79-008 |
|
Research Triangle Park Library/RTP, NC |
08/25/2000 |
| ELBD ARCHIVE |
EPA 600-7-79-008 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
| ESAD |
EPA 600-7-79-008 |
|
Region 10 Library/Seattle,WA |
03/23/2010 |
| NTIS |
FE-9001-1 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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." |
