Methods of preventing scaling involving inorganic compositions, and compositions therefor

• US 6,365,101 B1
• Filed: 03/10/2000
• Issued: 04/02/2002
• Est. Priority Date: 06/16/1999
• Status: Expired due to Fees

• Current Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Nguyen, Duy T., Zhang, Fushan, Ling, Tien-Feng, Fader, Mitzi K., Wang, Xiang Huai
• Primary Examiner(s): Thornton, Krisanne
• Application Number:
  US09/523,663
• Time in Patent Office: 753 Days
• Field of Search: 422/13, 422/18
• US Class Current: 422/13
• CPC Class Codes: C02F 2209/06 pH
• CPC Class Codes: C02F 5/00 Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents softening using ion-exchange C02F1/42
• CPC Class Codes: C02F 5/105 combined with inorganic substances

Abstract

Method for inhibiting scale deposits in an aqueous system. The method may include at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, wherein the aqueous system has a pH of at least about 9, and wherein a mean particle size of the anti-scalant is less than about 3 microns. The method may also include at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, and wherein the aqueous system has a pH of at least about 9; and adding dispersant to the aqueous system. The method may involve forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, and wherein a mean particle size of the anti-scalant is less than about 3 microns. The method may further include at least one of adding and forming anti-scalant in the aqueous system, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate; and adding at least one protein to the aqueous system. Compositions therefor.

Claims

1. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, wherein the aqueous system has a pH of at least about 9, and wherein a mean particle size of the anti-scalant is less than about 3 microns.

2. The method of claim 1, wherein the anti-scalant comprises polyvalent metal silicate and comprises at least one of sodium montmorillonite, magnesium aluminum silicate, talc, hydrated magnesium aluminum silicate, calcium bentonite, saponite, sepiolite, sodium aluminosilicate, hectorite, and amorphous magnesium silicate.

3. The method of claim 1, wherein the anti-scalant comprises polyvalent metal carbonate and comprises at least one of calcium carbonate, magnesium carbonate, ferrous carbonate, manganese carbonate, dolomite, and zinc carbonate.

4. The method of claim 1, wherein the anti-scalant comprises polyvalent metal carbonate, and wherein the polyvalent metal carbonate comprises ground calcium carbonate.

5. The method of claim 1, wherein the anti-scalant comprises ground calcium carbonate and sodium montmorillonite.

6. The method of claim 1, wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g.

7. The method of claim 1, wherein the scale comprises alkaline earth metal scale.

8. The method of claim 1, wherein the scale comprises at least one of calcium carbonate and calcium oxalate.

9. The method of claim 1, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant.

10. The method of claim 1, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of oxalate of about 0.1 to 10,000 ppm prior to addition of the anti-scalant.

11. The method of claim 1, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

12. The method of claim 1, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

13. The method of claim 1, wherein the anti-scalant is at least one of added and formed one of before and in at least one of a cooling tower, heat exchanger, evaporator, pulping digester, pulp washer, and pulp bleaching equipment.

14. The method of claim 1, wherein the aqueous system involves one of papermaking, mining, textile making, auto making, food processing, steel making, water treatment, and petroleum processing.

15. The method of claim 1, further comprising adding at least one additional anti-scalant to the aqueous system.

16. The method of claim 1, further comprising adding at least one protein to the aqueous system.

17. The method of claim 1, wherein the scale comprises calcium carbonate, and wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g, and wherein the aqueous system has a pH of about 9 to 14, and wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant, and wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

18. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, and wherein the aqueous system has a pH of at least about 9; and

adding dispersant to the aqueous system.

19. The method of claim 18, wherein the anti-scalant comprises polyvalent metal silicate and comprises at least one of sodium montmorillonite, magnesium aluminum silicate, talc, hydrated magnesium aluminum silicate, calcium bentonite, saponite, sepiolite, sodium aluminosilicate, hectorite, and amorphous magnesium silicate.

20. The method of claim 18, wherein the anti-scalant comprises polyvalent metal carbonate and comprises at least one of calcium carbonate, magnesium carbonate, ferrous carbonate, manganese carbonate, dolomite, and zinc carbonate.

21. The method of claim 18, wherein the anti-scalant comprises polyvalent metal carbonate, and wherein the polyvalent metal carbonate comprises ground calcium carbonate.

22. The method of claim 18, wherein the anti-scalant comprises ground calcium carbonate and sodium montmorillonite.

23. The method of claim 18, wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g.

24. The method of claim 18, wherein the scale comprises alkaline earth metal scale.

25. The method of claim 18, wherein the scale comprises at least one of calcium carbonate and calcium oxalate.

26. The method of claim 18, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant.

27. The method of claim 18, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of oxalate of about 0.1 to 10,000 ppm prior to addition of the anti-scalant.

28. The method of claim 18, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

29. The method of claim 18, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

30. The method of claim 18, wherein the anti-scalant is at least one of added and formed one of before and in at least one of a cooling tower, heat exchanger, evaporator, pulping digester, pulp washer, and pulp bleaching equipment.

31. The method of claim 18, wherein the aqueous system involves one of papermaking, mining, textile making, auto making, food processing, steel making, water treatment, and petroleum processing.

32. The method of claim 18, further comprising adding at least one additional anti-scalant to the aqueous system.

33. The method of claim 18, further comprising adding at least one protein to the aqueous system.

34. The method of claim 18, wherein the scale comprises calcium carbonate, and wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g, and wherein the aqueous system has a pH of about 9 to 14, and wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant, and wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

35. A method for inhibiting scale deposits in an aqueous system, comprising:

forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, wherein a mean particle size of the anti-scalant is less than about 3 microns.

36. A method for inhibiting scale deposits in an aqueous system, comprising:

forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate; and

adding dispersant to the aqueous system.

37. A method for inhibiting scale deposits in an aqueous system of a pulping mill, comprising:

at least one of adding and forming anti-scalant in the aqueous system at at least one of before a pulping digester and at a pulping digester, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate.

38. The method of claim 37, wherein the anti-scalant comprises polyvalent metal silicate and comprises at least one of sodium montmorillonite, magnesium aluminum silicate, talc, hydrated magnesium aluminum silicate, calcium bentonite, saponite, sepiolite, sodium aluminosilicate, hectorite, and amorphous magnesium silicate.

39. The method of claim 37, wherein the anti-scalant comprises polyvalent metal carbonate and comprises at least one of calcium carbonate, magnesium carbonate, ferrous carbonate, manganese carbonate, dolomite, and zinc carbonate.

40. The method of claim 37, wherein the anti-scalant comprises polyvalent metal carbonate, and wherein the polyvalent metal carbonate comprises ground calcium carbonate.

41. The method of claim 37, wherein the anti-scalant comprises ground calcium carbonate and sodium montmorillonite.

42. The method of claim 37, wherein the anti-scalant has a specific surface area of about 10 to 1000m²/g.

43. The method of claim 37, wherein the scale comprises alkaline earth metal scale.

44. The method of claim 37, wherein the scale comprises at least one of calcium carbonate and calcium oxalate.

45. The method of claim 37, further comprising adding up to about 10 ppm of coagulant to the aqueous system.

46. The method of claim 37, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant.

47. The method of claim 37, wherein the aqueous system has a pH of about 9 to 14.

48. The method of claim 37, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

49. The method of claim 37, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

50. The method of claim 37, further comprising adding at least one additional anti-scalant to the aqueous system.

51. The method of claim 37, further comprising adding at least one protein to the aqueous system.

52. The method of claim 37, further comprising removing the anti-scalant from the aqueous system by using at least one of a clarifier, flotation cell, settling tank, filter, centrifuge, and osmosis device.

53. The method of claim 37, wherein the scale comprises calcium carbonate, and wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g, and wherein the aqueous system has a pH of about 9 to 14, and wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant, and wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

54. A method for inhibiting scale deposits in an aqueous system of a pulping mill, comprising:

at least one of adding and forming anti-scalant in the aqueous system at at least one of immediately before a bleach plant stage and at a bleach plant stage, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate.

55. The method of claim 54, wherein the anti-scalant comprises polyvalent metal silicate and comprises at least one of sodium montmorillonite, magnesium aluminum silicate, talc, hydrated magnesium aluminum silicate, calcium bentonite, saponite, sepiolite, sodium aluminosilicate, hectorite, and amorphous magnesium silicate.

56. The method of claim 54, wherein the anti-scalant comprises polyvalent metal carbonate and comprises at least one of calcium carbonate, magnesium carbonate, ferrous carbonate, manganese carbonate, dolomite, and zinc carbonate.

57. The method of claim 54, wherein the anti-scalant comprises polyvalent metal carbonate, and wherein the polyvalent metal carbonate comprises ground calcium carbonate.

58. The method of claim 54, wherein the anti-scalant comprises ground calcium carbonate and sodium montmorillonite.

59. The method of claim 54, wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g.

60. The method of claim 54, wherein the scale comprises alkaline earth metal scale.

61. The method of claim 54, wherein the scale comprises at least one of calcium oxalate and calcium carbonate.

62. The method of claim 54, further comprising adding up to about 10 ppm of coagulant.

63. The method of claim 54, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of oxalate of about 0.1 to 10,000 ppm prior to addition of the anti-scalant.

64. The method of claim 54, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant.

65. The method of claim 54, wherein the aqueous system has a pH of about 2 to 12.

66. The method of claim 54, wherein the aqueous system is oxidative.

67. The method of claim 54, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

68. The method of claim 54, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

69. The method of claim 54, further comprising adding at least one additional anti-scalant to the aqueous system.

70. The method of claim 54, further comprising adding at least one protein to the aqueous system.

71. The method of claim 54, further comprising removing the anti-scalant from the aqueous system by using at least one of a clarifier, flotation cell, settling tank, filter, centrifuge, and osmosis device.

72. The method of claim 54, wherein the scale comprises at least one of calcium oxalate and calcium carbonate, and wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g, and wherein the aqueous system has a pH of about 2 to 12, and wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm prior to addition of the anti-scalant, and wherein prior to addition of the anti-scalant the aqueous system has at least one of a concentration of oxalate of about 0.1 to 10,000 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm, and wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

73. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises at least one of magnesium aluminum silicate, hydrated magnesium aluminum silicate, calcium bentonite, saponite, sepiolite, magnesium carbonate, ferrous carbonate, manganese carbonate, dolomite, hectorite, amorphous magnesium silicate, and zinc carbonate.

74. The method of claim 73, wherein the anti-scalant has a mean particle size of less than about 100 microns.

75. The method of claim 73, wherein the anti-scalant has a specific surface area of about 10 to 1000 m²/g.

76. The method of claim 73, wherein the scale comprises alkaline earth metal scale.

77. The method of claim 73, wherein the scale comprises at least one of calcium carbonate and calcium oxalate.

78. The method of claim 73, wherein the aqueous system has a concentration of Ca⁺² of about 10 to 500 ppm and a concentration of CO₃⁻

2 of about 100 to 30,000 ppm prior to addition of the anti-scalant.

79. The method of claim 73, wherein the aqueous system has a pH of about 2 to 14.

80. The method of claim 73, wherein the aqueous system is oxidative.

81. The method of claim 73, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

82. The method of claim 73, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

83. The method of claim 73, further comprising adding at least one additional anti-scalant to the aqueous system.

84. The method of claim 73, further comprising adding at least one protein to the aqueous system.

85. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-scalant comprises polyvalent metal carbonate, wherein a mean particle size of the anti-scalant is less than about 3 microns.

86. The method of claim 85, wherein the polyvalent metal carbonate comprises ground calcium carbonate.

87. The method of claim 85, wherein the scale comprises alkaline earth metal scale.

88. The method of claim 85, wherein the scale comprises at least one of calcium carbonate and calcium oxalate.

89. The method of claim 85, wherein the aqueous system has a pH of about 2 to 14.

90. The method of claim 85, wherein the aqueous system is oxidative.

91. The method of claim 85, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

92. The method of claim 85, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

93. The method of claim 85, further comprising adding at least one additional anti-scalant to the aqueous system.

94. The method of claim 85, further comprising adding at least one protein to the aqueous system.

95. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 1000 ppm, wherein the anti-sealant comprises polyvalent metal carbonate; and

adding dispersant to the aqueous system.

96. The method of claim 95, wherein the polyvalent metal carbonate comprises ground calcium carbonate.

97. The method of claim 95, wherein the scale comprises alkaline earth metal scale.

98. The method of claim 95, wherein the aqueous system has a pH of about 2 to 14.

99. The method of claim 95, wherein the aqueous system has a temperature of about 25°

C. to 500°

C.

100. The method of claim 95, wherein the aqueous system is at a pressure of about 80 to 1500 psi.

101. The method of claim 95, further comprising adding at least one additional anti-scalant to the aqueous system.

102. The method of claim 95, further comprising adding at least one protein to the aqueous system.

103. A method for inhibiting scale deposits in an aqueous system, comprising:

at least one of adding and forming anti-scalant in the aqueous system, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate; and

adding at least one protein to the aqueous system.

104. The method of claim 103, wherein an amount of anti-scalant in the aqueous system is up to about 1000 ppm.

105. The method of claim 103, wherein the anti-scalant has a mean particle size less than about 100 microns.

106. The method of claim 103, wherein the aqueous system has a pH of at least about 9.

107. The method of claim 103, wherein the at least one protein comprises soy protein.