Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-04-03
1986-10-28
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041822, 2041824, 204151, 204152, 204301, B01D 1302
Patent
active
046197478
ABSTRACT:
An electrofiltering process for dewatering or separating particles from a liquid or a colloidal suspension, which comprises the use of an electrofilter with separated, submerged electrodes, consisting of a cathode assembly and an anode assembly, wherein the filtrate is recirculated from the cathode assembly of the electrofilter into the anode assembly where it is utilized as anolyte. An initial electrolytic solution containing a soluble compound of an alkali or alkaline earth metal, such as NaOH or NaHCO.sub.3, is added to the anode assembly as anolyte. A direct current is applied to the electrofilter, so that negatively charged particles in the suspension will migrate towards the anode assembly and form a caked deposit or slurry layer on the outside of the assembly. Simultaneouslly, the electrode reactions at the cathode will split water into hydrogen gas and hydroxide. This hydroxide is diluted with filtrate passing into the cathode assembly. The resulting hydroxide solution/filtrate is recirculated to the anode assembly where it is neutralized by acid, H.sup.+, generated at the anode by hydrolysis of water, to produce water. Alkaline ions which are associated with hydroxide solution filtrate for charge neutrality are transported from the cathode assembly to the anode assembly with the hydroxide solution filtrate. There they migrate from the anode assembly through the suspension and back into the filtrate under the influence of the electric field. They are spectator ions and do not enter into the anode or cathode reactions. Recirculation of the filtrate to the anolyte reduces electrofiltration operating costs and results in a superior filtered product.
REFERENCES:
patent: 4048038 (1977-09-01), Kunkle
patent: 4132626 (1979-01-01), Kunkle
patent: 4168222 (1979-09-01), Freeman
patent: 4207158 (1980-06-01), Freeman
patent: 4312729 (1982-01-01), Wills
patent: 4432860 (1984-02-01), Bachot et al.
Freeman, deceased Mark P.
Hoadley Jonathan K.
Chapman Terryence
Dorr-Oliver
Greeley Paul D.
Kearns Burtsell J.
Niebling John F.
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