Refining of fossil resin flotation concentrate from western coal. Final report

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During the past several years, significant research efforts have been made to develop process technology for the selective flotation of fossil resin from western coals. As a result of these efforts, several new flotation technologies have been developed. Operation of a proof-of-concept continuous flotation circuit showed the selective flotation process to be sufficiently profitable to justify the development of a fossil resin industry. However, little attention has been given to the refining of the fossil resin flotation concentrate although solvent refining is a critical step for the fossil resin to become a marketable product. In view of this situation, DOE ... continued below

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149 p.

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Jensen, G.F. & Miller, J.D. February 16, 1995.

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Description

During the past several years, significant research efforts have been made to develop process technology for the selective flotation of fossil resin from western coals. As a result of these efforts, several new flotation technologies have been developed. Operation of a proof-of-concept continuous flotation circuit showed the selective flotation process to be sufficiently profitable to justify the development of a fossil resin industry. However, little attention has been given to the refining of the fossil resin flotation concentrate although solvent refining is a critical step for the fossil resin to become a marketable product. In view of this situation, DOE funded this two-year project to evaluate the following aspects of the fossil resin refining technology: 1) Characterization of the fossil resin flotation concentrate and its refined products; 2) Kinetics of fossil resin extraction; 3) Effects of operating variables on solvent extraction; 4) Extraction solvents; 5) Proof-of-concept continuous refining tests; and 6) Technical and economic analysis. The results from this research effort have led to the following conclusions: Hexane- or heptane-refined fossil resin has a light-yellow color, a melting point of 140 - 142{degrees}C, a density of 1.034 gram/cm, and good solubility in nonpolar solvents. Among the four solvents evaluated (hexane, heptane, toluene and ethyl acetate), hexane is the most appropriate solvent based on overall technical and economic considerations. Batch extraction tests and kinetic studies suggest that the main interaction between the resin and the solvent is expected to be the forces associated with solvation phenomena. Temperature has the most significant effect on extraction rate. With hexane as the solvent, a recovery of 90% cam be achieved at 50{degrees}C and 10% solids concentration with moderate agitation for 1 hour.

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149 p.

Notes

OSTI as DE96012999

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  • Other Information: PBD: 16 Feb 1995

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  • Other: DE96012999
  • Report No.: DOE/PC/92251--T10
  • Grant Number: AC22-93PC92251
  • DOI: 10.2172/259415 | External Link
  • Office of Scientific & Technical Information Report Number: 259415
  • Archival Resource Key: ark:/67531/metadc667484

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  • February 16, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 25, 2015, 12:30 p.m.

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Jensen, G.F. & Miller, J.D. Refining of fossil resin flotation concentrate from western coal. Final report, report, February 16, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc667484/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.