Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2000-02-11
2001-11-13
Metzmaier, Daniel S. (Department: 1712)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C210S735000, C516S168000
Reexamination Certificate
active
06315908
ABSTRACT:
BACKGROUND OF INVENTION
This invention concerns a method for the treatment of waste water using the reaction product of a polyetheramine and a multifunctional epoxide formed in situ to cause flocculation to thereby break a water/oil emulsion.
The use of polyamines to treat industrial laundry waste-water is known. It is believed that the positive charge on the polymer interacts with the negative charge on the waste-water emulsion droplets causing destabilization. This causes the emulsion to break so that the oil phase can be removed by dissolved air flotation (DAF) or chemical precipitation (CP).
Polyamines are typically prepared by reacting primary and secondary amines with epichlorohydrin. Use of secondary amines results in quaterization so the charge density can be controlled by the ratio of primary to secondary amine.
SUMMARY OF INVENTION
The present invention provides a solution to one or more of the disadvantages and deficiencies described above.
In one broad respect, this invention is a method for the treatment of waste-water, which comprises: reacting a polyetheramine and a multifunctional epoxide in waste-water composition that initially is in the form of an emulsion to form a reaction product that causes the emulsion to break into a water phase and an oil phase. This method may include separating the water phase from the oil phase after the emulsion has been broken. In general, this separation of oil and water phases may be accomplished by dissolved air flotation (DAF) or chemical precipitation (CP).
In another broad respect, this invention is a method for the treatment of waste-water, which comprises: adding a multifunctional epoxide to a waste-water composition initially in the form of an emulsion and that contains a polyetheramine such that the multifunctional epoxide and the polyetheramine react to form a reaction product, wherein the amounts of epoxide and polyetheramine are used in a quantity sufficient to form an amount of reaction product effective to cause the emulsion to separate into a water phase and an oil phase.
In another broad respect, this invention is a reaction product of a multifunctional epoxide and a polyetheramine.
Advantageously, the polymer that serves to break the emulsion is formed in situ. Also, the composition of this invention is relatively insensitive to polymer concentration, which is a big problem with existing polyamine chemistry.
REFERENCES:
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patent: 4626379 (1986-12-01), Buriks et al.
patent: 5763506 (1998-06-01), Papalos et al.
patent: 6153106 (2000-11-01), Kelley et al.
patent: 0 517 167 A2 (1992-06-01), None
patent: WO 97/35067 (1997-09-01), None
Huntsman Petrochemical Corporation
Metzmaier Daniel S.
O'Keefe Egan & Peterman, LLP
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