Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1988-11-28
1992-09-15
Shaver, Kevin P.
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
44624, 44626, 44627, 204190, 204302, 204307, 208187, 208188, 2091271, B03B 104, B03C 500, C10G 3304
Patent
active
051470454
ABSTRACT:
The use of electrostatic demulsification methods to separate fine particulates of differing surface characteristics is disclosed. In one example, particles of hydrophobic coal and hydrophilic kaolin clay, each of nominal 3.5 micron mass mean particle diameter, were separated from a variety of stable water-in-oil emulsions. 50/50 blends of coal of 4% ash and kaolin clay of 86.5% ash were used in the experiments. A variety of oils, water concentrations, solids concentrations, and emulsifiers have been used in this work. Externally applied electrostatic fields up to 1.2 kV/cm were used. Greater than 90% rejection of kaolin particles into the separated water phase was achieved with virtually complete recovery of the coal particles uniformly suspended in the oil phase. Under conditions resulting in the most efficient separation, we have observed that the coalesced water phase appeared as intertwined cylindrical tubes extending between electrodes, as opposed to nonconnected and chained droplets which have been reported by others. The fine kaolin particulates were observed to be water-encased while most coal particles remained dispersed in the oil continuum.
REFERENCES:
patent: 1405130 (1922-01-01), Harris
patent: 1529349 (1925-03-01), Eddy
patent: 1838379 (1931-12-01), Fisher
patent: 2027615 (1936-01-01), Prutzman
patent: 2447529 (1948-08-01), Perkins, Jr.
patent: 3331765 (1967-07-01), Canevari et al.
patent: 3582527 (1971-06-01), Lucas
patent: 4226689 (1980-10-01), Mayse et al.
patent: 4226690 (1980-10-01), Martin
patent: 4252631 (1981-02-01), Hovarongkura et al.
patent: 4290882 (1981-09-01), Dempsey
patent: 4402807 (1983-09-01), Merchant, Jr.
patent: 4511452 (1985-04-01), Robinson
patent: 4526585 (1985-07-01), Burgess et al.
patent: 4879014 (1989-11-01), van Laar et al.
Cooper et al., "The Relevance of "HLB" to De-Emulsification of a Mixture of Heavy Oil, Water and Clay", Canadian J. of Eng., vol. 58 Oct. 1980.
Menon, et al., "Characterization of Oil-Water Interfaces Containing Finely Divided Solids with Applications to the Coalescence of Water-In-Oil Emulsions: A Review, Colloids and Surfaces", vol. 29, No. 1, pp. 7-27.
Gelot, et al., "Emulsification of Oil and Water (1988), In the Presence of Finely Divided Solids and Surface-Active Agents, Colloids and Surfaces", vol. 12, pp. 271-303 (1984).
Chi Sheng-Ming B.
Oder Robin R.
EXPORTech Company, Inc.
Kline Michael J.
Shaver Kevin P.
Wacyra Edward M.
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