Method of clarifying oily waste water

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

Reexamination Certificate

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C210S734000, C210S735000, C210S736000, C516S148000, C516S161000, C516S179000

Reexamination Certificate

active

07431845

ABSTRACT:
A method of clarifying oily waste water comprising adding to the waste water an effective clarifying amount of one or more demulsifiers selected from the group consisting of dendritic polyamines, dendritic polyamidoamines and hyperbranched polyethyleneimines and the reaction products thereof with gluconolactone, alkylene oxides, salts of 3-chloro-2-hydroxypropanesulfonic acid, alkyl halides, benzyl halides and dialkyl sulfates.

REFERENCES:
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patent: 4308149 (1981-12-01), Selvarajan
patent: 4457860 (1984-07-01), Conklin et al.
patent: 4737550 (1988-04-01), Tomalia
patent: 4935162 (1990-06-01), Barthold et al.
patent: 5045212 (1991-09-01), Augustin et al.
patent: 5445765 (1995-08-01), Elfers et al.
patent: 5759409 (1998-06-01), Knauf et al.
patent: 5846453 (1998-12-01), Mohr et al.
patent: 5977293 (1999-11-01), Steuerle et al.

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