Method for monitoring fluorescent polymer antiscalants in industrial water systems
AssigneeDow Global Technologies LLC
InventorsKaylie L. Young, Clark H. Cummins, William C. Glover, Robert David Grigg
Life of this patent
Estimating the term…
Abstract
The present invention relates to a fluorescently-tagged (co)polymer and use thereof useful as a scale inhibitor in industrial water systems. Said (co)polymer comprises a (i) reactive fluorescent compound selected from a benzodiazole compound (ii) at least one monoethylenically unsaturated acid monomer, and (iii) optionally, at least one monoethylenically unsaturated acid-free monomer.
Claims6
A method for maintaining a desired amount of benzodiazole-tagged (co)polymer in an industrial water system comprising the steps of:
- a) adding a benzodiazole-tagged (co)polymer to water such that a desired concentration of said benzodiazole-tagged (co)polymer is present in said water, wherein the benzodiazole-tagged (co)polymer comprises:
- (i) a benzodiazole compound, or salt thereof, represented by one of the following formulas:
- wherein R1 to R9 are independently H, a C1 to C12 alkyl group, a C1 to C12 aryl group, —SO3−, —PO32−, —CO2−, or —N+R103 wherein each R10 is independently H or C1 to C12 alkyl and X is oxygen or sulfur,
- b) using a fluorometer to detect a fluorescent signal of said benzodiazole-tagged (co)polymer;
- c) converting the fluorescent signal of the (co)polymer to a concentration of said benzodiazole-tagged (co)polymer;
- and
- d) adjusting the concentration of said benzodiazole-tagged (co)polymer according to what the desired concentration is for said benzodiazole-tagged (co)polymer in the industrial water system.
A method to inhibit scale in an industrial water system comprising the steps of:
- a) providing a scale inhibitor for an industrial water system susceptible to unwanted scaling and
- b) adding to the water of said industrial water system from 0.1 ppm to 50 ppm of a scale inhibitor;
- wherein said scale inhibitor is a benzodiazole-tagged (co)polymer comprising:
- (i) a benzodiazole compound, or salt thereof, represented by one of the following formulas:
- wherein R1 to R9 are independently H, a C1 to C12 alkyl group, a C1 to C12 aryl group, —SO3−, —PO32−, —CO2−, or —N+R103 wherein each R10 is independently H or C1 to C12 alkyl and X is oxygen or sulfur.
Dependencies are inferred from the claim text.