Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1979-12-06
1981-02-03
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204186, B01D 1706, B03C 500
Patent
active
042486866
ABSTRACT:
A filter for clarifying carbonaceous liquids containing finely divided solid particles of, for instance, unreacted coal, ash and other solids discharged from a coal liquefaction process is presented. The filter includes two passageways separated by a porous filter medium. In one preferred embodiment the filter medium is of tubular shape to form the first passageway and is enclosed within an outer housing to form the second passageway within the annulus. An electrode disposed in the first passageway, for instance along the tube axis, is connected to a source of high voltage for establishing an electric field between the electrode and the filter medium. Slurry feed flows through the first passageway tangentially to the surfaces of the filter medium and the electrode. Particles from the feed slurry are attracted to the electrode within the first passageway to prevent plugging of the porous filter medium while carbonaceous liquid filters into the second passageway for withdrawal. Concentrated slurry is discharged from the first passageway at an end opposite to the feed slurry inlet. Means are also provided for the addition of diluent and a surfactant into the slurry to control relative permittivity and the electrophoretic mobility of the particles.
REFERENCES:
patent: 1838924 (1931-12-01), Fisher
patent: 2116509 (1938-05-01), Cottrell
patent: 2640026 (1953-05-01), Whittington
patent: 3582489 (1971-06-01), Meadow
patent: 4066526 (1978-01-01), Yeh
Gidaspow Dimitri
Lee Chang H.
Wasan Darsh T.
Denny James E.
Glenn Hugh W.
Jackson Frank H.
The United States of America as represented by the United States
Tufariello T. M.
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