Use of magnetic separation in scavenging hydrogen sulfide

Details Use of magnetic separation in scavenging hydrogen sulfide Use of magnetic separation in scavenging hydrogen sulfide

C - Chemistry, Metallurgy

02

F

362/59, 31/9

C02F 1/48 (2006.01)

Patent

CA 1202737

USE OF MAGNETIC SEPARATION IN SCAVENGING HYDROGEN SULFIDE 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 Fe3O4, 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 cutting 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.

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