Water clarification through chelation

Details Water clarification through chelation Water clarification through chelation

1990-04-16

1992-07-07

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

166267, 210708, 210728, 210734, 210735, C02F 156

Patent

active

051280469

ABSTRACT:
Improved water quality of overboard waters discharged from off-shore oil producing rigs is obtained by treating oily produced waters from a crude oil separator, and prior to exposure to air, with an effective coalescing amount of a combination of an iron chelating agent and various polymeric coagulating/coalescing agents. The preferred chelating agent is citric acid, or its salts, EDTA, HEDTA, or mixtures thereof. The polymeric coagulating/coalescing agents may be anionic, cationic, ampohoteric, but are most preferably copolymers of acrylamide with at least one of the monomers chosen from the group consisting of acrylic acid, methacrylic acid, DMAEA, DMAEM, or their acid of quaternary salts, DADMAC, MAPTAC, AMPS, and the like.

REFERENCES:
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patent: 4049547 (1977-09-01), Hamer et al.
patent: 4198300 (1980-04-01), Williams
patent: 4454047 (1984-06-01), Becker et al.
patent: 4588508 (1986-05-01), Allenson et al.
patent: 4741835 (1988-05-01), Jacques et al.
patent: 4835234 (1989-05-01), Valint et al.

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