Liquid purification or separation – Processes – Using magnetic force
Patent
1982-08-09
1984-10-09
Thomas, Earl C.
Liquid purification or separation
Processes
Using magnetic force
423231, 204155, 210713, 210916, 209 8, 208244, B01D 1500, C09K 704
Patent
active
044760272
ABSTRACT:
Use of ferri-magnetic reactive iron oxide particles to react hydrogen sulfide in water, hydrocarbon liquids or drilling mud affords quick, effective scavenging of these liquids without accumulation of particulate matter and without wasting the reactive particles. The reaction product is environmentally safe, so that it may be disposed of on a simple waste heap.
A quantity of the magnetic iron oxide particles, principally a synthetic porous Fe.sub.3 O.sub.4, is suspended in the liquid. The quantity added is in excess of that required for the reaction with the hydrogen sulfide in order to speed the reaction time and provide a large margin of safety. In use, the reactive iron oxide particles contact and react the hydrogen sulfide, forming a non-magnetic particulate product of reaction. Thus, if used to scavenge a drilling mud, this contact and reaction occurs as the mud, bearing the drill cuttings, rises through the drilling formation.
By passing the liquid, or at least that portion of it which includes all particulate matter, through a magnetic separator, substantially all, or at least the greater part of, the unreacted oxide particles are recovered for re-use. Since the unreacted particles are characterized by low remanent magnetism, after the magnetic separation they are readily re-suspended in such liquid.
REFERENCES:
patent: 2276075 (1942-03-01), Wuensch
patent: 4008775 (1977-02-01), Fox
patent: 4269279 (1981-05-01), House
patent: 4324298 (1982-04-01), Fox
patent: 4344842 (1982-08-01), Fox
Garrett et al., "Chemical Scavengers for Sulfides in Water-Base Drilling Fluids", Journal of Petroleum Technology, vol. XXXI, June 1979, pp. 787-796.
Ray et al., "Use of Reactive Iron Oxide to Remove H.sub.2 S From Drilling Fluid", Journal of Petroleum Technology, vol. XXXI, June 1979, pp. 797-801.
Gross Jerome A.
Samuels Alvin
Samuels David
Thomas Earl C.
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