Liquid purification or separation – Processes – Chemical treatment
Reexamination Certificate
2005-11-01
2005-11-01
Hoey, Betsey Morrison (Department: 1724)
Liquid purification or separation
Processes
Chemical treatment
C252S180000, C524S319000, C524S339000
Reexamination Certificate
active
06960304
ABSTRACT:
Methods for treating wastewater comprising adding to wastewater a defoaming and/or surfactant-effective quantity of at least one base-catalyzed branched reaction product comprising the following reactants:A) at least one compound of formula Iin-line-formulae description="In-line Formulae" end="lead"?R1(X)3 (I)in-line-formulae description="In-line Formulae" end="tail"?wherein each X group is a halogen atom or one X group is a halogen atom and two X groups represent an epoxy oxygen atom, which is attached to two adjacent carbon atoms in the R1group to form an epoxy group, and R1is an alkanetriyl group containing from 3 to 10 carbon atoms; andB) at least one compound having the formula IIin-line-formulae description="In-line Formulae" end="lead"?R2X(AO)nY (II)in-line-formulae description="In-line Formulae" end="tail"?wherein R2is a substituted or unsubstituted, saturated or unsaturated, organic group having from 1 to 36 carbon atoms; X is —O—, —S—, or —NR3— where R3is hydrogen or a C1–C18alkyl group; each AO group is independently an ethyleneoxy, 1,2-propyleneoxy, or 1,2-butyleneoxy group, n is a number of from 0 to 200; and Y is hydrogen, or Y can be a mercapto group or an amino group or a C1–C6alkylamino group in place of a terminal —OH group, provided that when Y is mercapto or an amino group or a C1–C6alkylamino group, n is at least 1;wherein the mole ratio of the linking compound a) to b) is from 0.1:1 to 5:1; and to wastewaters containing the above base-catalyzed reaction products.
REFERENCES:
patent: 5108655 (1992-04-01), Johns et al.
patent: 5827453 (1998-10-01), Gross et al.
patent: 6512016 (2003-01-01), Khan et al.
patent: 2001/0031813 (2001-10-01), Breindel et al.
Breindel Kenneth
Broadbent Ronald W.
Brown David W.
Wiggins Michael S.
Cognis Corporation
Daniels John F.
Hoey Betsey Morrison
Seifert Arthur G.
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