Recovery of surfactant from papermaking process

Details Recovery of surfactant from papermaking process Recovery of surfactant from papermaking process

C - Chemistry, Metallurgy

02

F

C02F 1/24 (2006.01) C02F 11/12 (2006.01) D21F 11/00 (2006.01) D21H 17/09 (2006.01)

Patent

CA 2053504

Surfactant is recovered from the foamed aqueous admixture recovered from a fibrous web forming process by draining surfactant-depleted liquid from the foamed aqueous admixture thereby forming a surfactant-enriched foam, separating the surfactant-depleted liquid from the surfactant-enriched foam and recycling surfactant from the surfactant-enriched foam to the fibrous web forming process in the form of a stream having a surfactant concentration exceeding that of the foamed aqueous admixture. The recycle stream may be obtained by removing air from the surfactant-enriched foam. Surfactant may also be recovered from the surfactant-depleted stream by aerating it to form a foam from which surfactant-lean liquid is drained. The process may be repeated on the surfactant-lean liquid until the surfactant content of the finally obtained lean liquid is sufficiently low to permit discharge to the environment.

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