Metal oxides dispersant composition
View Patent ↗This invention relates to metal oxides dispersant compositions comprising (a) certain a metal oxides dispersant, and (b) an oxime. The invention also relates to a process for dispersing metal oxides in an aqueous system that involves adding the dispersant composition to the aqueous system.
1. A process for improving the dispersability of metal oxides in an aqueous system which comprises:
adding to an aqueous system a composition comprising:
(a) a water-soluble, hydrolyzed or partially hydrolyzed, copolymer of acrylamide monomers and acrylate monomers, and
(b) methyl ethyl ketoxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1, and whereby (a) and (b) can be added separately at the same location, or independent locations, or as a mixture.
2. The process of claim 1 wherein the aqueous system is in contact with the metal surface of a heat exchanger of a steam generating system which contains residual dispersant and the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
3. The process of claim 2 , wherein the steam generator residual dispersant is from 1 to 100 ppm.
4. The process of claim 3 , wherein the steam generator residual dispersant is from 2 to 50 ppm.
5. The process of claim 4 , wherein the steam generator residual dispersant is from 5 to 25 ppm.
6. The process of claim 5 , wherein the oxime is added to a feedpoint which will expose the said methyl ethyl ketoxime to a temperature of at least 65° C.
7. A process for improving the dispersability of metal oxides in an aqueous system which comprises:
adding to an aqueous system a composition comprising:
(a) a sulfonated styrene/maleic anhydride, and
(b) methyl ethyl ketoxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1, and whereby (a) and (b) can be added separately at the same location, or independent locations, or as a mixture.
8. The process of claim 7 , wherein the aqueous system is in contact with the metal surface of a heat exchanger of a steam generating system which contains residual dispersant and the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
9. The process of claim 8 , wherein the steam generator residual dispersant is from 1 to 100 ppm.
10. The process of claim 9 , wherein the steam generator residual dispersant is from 2 to 50 ppm.
11. The process of claim 10 , wherein the steam generator residual dispersant is from 5 to 25 ppm.
12. The process of claim 11 , wherein the oxime is added to a feedpoint which will expose the said methyl ethyl ketoxime to a temperature of at least 65° C.
13. The process of claim 1 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
14. The process of claim 7 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
15. A dispersant composition for dispersing metal oxides in aqueous systems comprising:
(a) a water-soluble, hydrolyzed or partially hydrolyzed, copolymer of acrylamide monomers and acrylate monomers, and
(b) methyl ethyl ketoxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1.
16. The composition of claim 15 , wherein the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
17. The composition of claim 15 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
18. A dispersant composition for dispersing metal oxides in aqueous systems comprising:
(a) a sulfonated styrene/maleic anhydride, and
(b) methyl ethyl ketoxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1.
19. The composition of claim 18 , wherein the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
20. The composition of claim 18 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
21. A dispersant composition for dispersing metal oxides in aqueous systems comprising:
(a) a phosphonated nonionic alkyl polymer, and
(b) methyl ethyl ketoxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1.
22. The composition of claim 21 , wherein the weight ratio of (a) to (b) is from 0.5:1.0 to 5.1.
23. The composition of claim 21 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
24. A dispersant composition for dispersing metal oxides in aqueous systems comprising:
(a) a phosphino carboxylate, and
(b) an oxime,
wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1.
25. The composition of claim 24 , wherein the oxime is methyl ethyl ketoxime.
26. The composition of claim 24 , wherein the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
27. The composition of claim 24 , wherein the composition comprises a dispersant wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate, and mixtures thereof.
28. A process for improving the dispersability of metal oxides in an aqueous system comprising:
adding to an aqueous system a composition comprising:
(a) a dispersant and
(b) methyl ethyl ketoxime,
whereby (a) and (b) can be added separately at the same location or independent locations or as a mixture.
29. The process of claim 28 , wherein the aqueous system is in contact with the metal surface of a heat exchanger of a steam generating system which contains residual dispersant and the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.
30. The process of claim 28 , wherein the steam generator residual dispersant is from 1 to 100 ppm.
31. The process of claim 28 , wherein the steam generator residual dispersant is from 2 to 50 ppm.
32. The process of claim 31 , wherein the steam generator residual of the dispersant is from 5 to 25 ppm.
33. The process of claim 32 , wherein the oxime is added to a feedpoint which will expose the said methyl ethyl ketoxime to a temperature of at least 65° C.
34. A dispersant composition for dispersing metal oxides in aqueous systems comprising:
(a) a dispersant and
(b) methyl ethyl ketoxime,
wherein the dispersant is selected from the group consisting of an orthophosphate, a polyphosphate, a phosphonate and mixtures thereof and wherein the weight ratio of (a) to (b) is from 0.5:1 to 20:1.
35. The composition of claim 34 , wherein the weight ratio of (a) to (b) is from 0.5:1.0 to 5:1.