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US 10,308,532 B2Granted
Method to treat flushing liquor systems in coke plants
AssigneeBl Technologies, Inc.
InventorsGuixi Zhang, Jason Zhao
Life of this patent
Estimating the term…
Abstract
Methods are disclosed for reducing oil in water emulsions in coking processes. One exemplary method comprises: providing an aqueous stream with an oil in water emulsion; providing a treatment composition, wherein the treatment composition comprises at least one cationic polyacrylamide; and contacting the aqueous stream with the treatment composition.
Claims17
A method of demulsifying an oil in water emulsion present in an aqueous stream of a coking process comprising:
- passing said aqueous stream comprising an oil in water emulsion from an upstream to downstream direction to and through a decanter, wherein said oil in water emulsion comprises tars and other contaminants formed in a coking process;
- and
- contacting said aqueous stream with a treatment composition prior to introducing said aqueous stream into the decanter of said coking process, said treatment composition comprising a cationic polyacrylamide copolymer and downstream from said decanter, contacting said aqueous stream with an ethoxylated surfactant in addition to, or instead of any surfactant present in said treatment composition, wherein said ethoxylated surfactant comprises at least one ethoxylated compound having the formula:
- R—O—(CH2CH2O)n—H
- where n is equal to or greater than about 20;
- and R is at least one chain of a branched alkyl phenol, a branched or linear fatty alcohol, a fatty acid alkanolamide, or a fatty acid, and
- said cationic polyacrylamide copolymer comprising repeat units (x) and (y) of the formula
- wherein R1 and R2 are the same or different and are chosen from H and CH3;
- Q is —C(O)O—, or —OC(O)—, or —C(O)NH—;
- R3 is branched or linear C1-C4 alkyl;
- R4, R5, and R6 are independently chosen from H, C1-C4 linear or branched alkyl, or a C5-C8 aromatic or alkylaromatic group;
- A is an anion selected from Cl−, Br−, HSO4−, or MeOSO3− wherein the molar ratio of repeat units (x):repeat units (y) is about 10:90 to about 40:60.
9 more elements
A method of demulsifying an oil in water emulsion present in an aqueous stream of a coking process comprising:
- passing said aqueous stream comprising an oil in water emulsion from an upstream to downstream direction to and through a decanter, wherein said oil in water emulsion comprises tars and other contaminants formed in a coking process;
- and
- contacting said aqueous stream with a treatment composition prior to introducing said aqueous stream into the decanter of said coking process, said treatment composition comprising a cationic acrylamide copolymer and downstream from said decanter, contacting said aqueous stream with an ethoxylated surfactant in addition to, or instead of any surfactant present in said treatment composition, wherein said ethoxylated surfactant comprises at least one ethoxylated compound having the formula:
- R—O—(CH2CH2O)n—H
- where n is equal to or greater than about 20;
- and R is at least one chain of a branched alkyl phenol, a branched or linear fatty alcohol, a fatty acid alkanolamide, or a fatty acid, and
- said cationic acrylamide copolymer comprising repeat units of (x) (meth)acrylamide and (y) quaternary ammonium salt;
- wherein said repeat unit (y) of said cationic acrylamide copolymer comprises a member selected from the group consisting of:
- a) dimethylaminoethyl (meth)acrylate methyl chloride;
- b) dimethylaminoethyl (meth)acrylate methyl sulfate;
- c) dimethylaminoethyl (meth)acrylate benzyl chloride;
- d) acrylamidopropyl trimethylammonium chloride;
- e) dimethylaminopropyl (meth)acrylamide methyl sulfate;
- f) diallyldiethyl ammonium chloride;
- and
- g) diallyldimethylammonium chloride.
13 more elements
Dependencies are inferred from the claim text.