Combination of soluble lithium salt and soluble aluminum or silicate salt as a glass etching inhibitor

• US 8,399,393 B2
• Filed: 05/03/2010
• Issued: 03/19/2013
• Est. Priority Date: 05/03/2010
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Miralles, Altony
• Primary Examiner(s): BOYER, CHARLES I
• Application Number:
  US12/772,394
• Publication Number:
  US 20110269660A1
• Time in Patent Office: 1,051 Days
• Field of Search: 510/220, 510/224, 510/225, 510/227, 510/232, 510/233
• US Class Current: 510/220
• CPC Class Codes: C11D 2111/18 Glass; Plastics
• CPC Class Codes: C11D 3/0073 Anticorrosion compositions
• CPC Class Codes: C11D 7/06 Hydroxides
• CPC Class Codes: C11D 7/10 Salts
• CPC Class Codes: C11D 7/14 Silicates

Abstract

A warewashing detergent composition is provided including an alkalinity source, a corrosion inhibitor and optionally, a cleaning agent. The glass corrosion inhibitor includes at least a soluble lithium salt and optionally includes a soluble aluminum salt and/or a soluble silicate salt. The warewashing detergent composition has a pH of at least about 8.

Claims

1. A warewashing detergent composition comprising:

(a) between about 5% by weight and 75% by weight of an alkalinity source; and

(b) between about 0.1% by weight and 2.5% by weight of a glass corrosion inhibitor comprising a soluble lithium salt and at least one of a soluble aluminum salt and a soluble silicate salt,

wherein if a soluble aluminum salt is present, the soluble aluminum salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble salt of between about 410;

1 and about 1;

10, and

wherein if a soluble silicate salt is present, the soluble silicate salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble silicate salt to soluble lithium salt of between about 40;

1 and about 1;

40.

2. The warewashing detergent composition of claim 1, wherein if a soluble aluminum salt and a soluble silicate salt are present, the soluble aluminum salt, the soluble silicate salt, and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble silicate salt to soluble lithium salt of between about 10:

40;

1 and about 4;

1;

40.

3. The warewashing detergent composition of claim 1, wherein if a soluble aluminum salt is present, the soluble aluminum salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble lithium salt of between about 4:

1 and about 1;

3, wherein if a soluble silicate salt is present, the soluble silicate salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble silicate salt to soluble lithium salt of between about 1;

20 and about 1;

15; and

wherein if a soluble aluminum salt and a soluble silicate salt are present, the soluble aluminum salt, the soluble silicate salt, and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble silicate salt to soluble lithium salt of between about 1;

1;

17.8 and about 1.08;

1;

17.7.

4. The warewashing detergent composition of claim 1, wherein the soluble aluminum salt is selected from the group consisting of:

sodium aluminate, potassium aluminate, aluminum bromide, aluminum chlorate, aluminum chloride, aluminum iodide, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum formate, aluminum tartrate, aluminum lactate, aluminum oleate, aluminum bromate, aluminum borate, aluminum potassium sulfate, aluminum lithium sulfate, aluminum phosphate and mixtures thereof.

5. The warewashing detergent composition of claim 1, wherein the soluble lithium salt is selected from the group consisting of:

lithium hydroxide, lithium chloride, lithium sulfate, lithium nitrate, lithium iodide, lithium thiocyanate, lithium fluorosilicate, lithium dichromate, lithium chlorate, sodium lithiumate, lithium gluconate, lithium acetate, lithium benzoate, lithium citrate, lithium lactate, lithium formate, lithium bromate, lithium bromide, lithium fluoride, lithium fluosilicate, lithium silicate, lithium salicylate and mixtures thereof.

6. The warewashing detergent composition of claim 1, wherein the soluble silicate salt is selected from the group consisting of:

lithium metasilicate, sodium metasilicate, potassium metasilicate, sodium orthosilicate, potassium orthosilicate and mixtures thereof.

7. The warewashing detergent composition of claim 1, wherein the warewashing detergent composition comprises between about 0.2% by weight and about 2.0% by weight corrosion inhibitor.

8. The warewashing detergent composition of claim 1, further comprising a cleaning agent.

9. The warewashing detergent composition of claim 8, wherein the warewashing detergent composition comprises between about 0.5% by weight and about 20% by weight cleaning agent.

10. The warewashing detergent composition of claim 1 wherein the alkalinity source is selected from the group consisting of sodium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium sesquicarbonate, potassium sesquicarbonate and mixtures thereof.

11. A method for using a warewashing detergent composition, the method comprising:

(a) diluting a warewashing detergent composition with water at a dilution ratio of at least about 20;

1 water to warewashing detergent composition to form a use solution, wherein the warewashing detergent composition comprises;

(i) between about 0.5% by weight and about 20% by weight cleaning agent;

(ii) between about 5% by weight and 75% by weight of an alkalinity source; and

(iii) between about 0.1% by weight and 2.5% by weight of a glass corrosion inhibitor, the corrosion inhibitor comprising a soluble lithium salt and at least one of an soluble aluminum salt and a soluble silicate salt; and

(b) washing glassware with the use solution in an automatic dishwashing machine,

wherein if a soluble aluminum salt is present, the soluble aluminum salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble salt of between about 410;

1 and about 1;

10, and

wherein if a soluble silicate salt is present, the soluble silicate salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble silicate salt to soluble lithium salt of between about 40;

1 and about 1;

40.

12. The method of claim 11, wherein the warewashing detergent composition is provided as a solid.

13. The method of claim 11, wherein the alkalinity source is selected from the group consisting:

of sodium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium sesquicarbonate, potassium sesquicarbonate and mixtures thereof.

14. The method of claim 11, wherein the soluble aluminum salt is selected from the group consisting of:

sodium aluminate, potassium aluminate, aluminum bromide, aluminum chlorate, aluminum chloride, aluminum iodide, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum formate, aluminum tartrate, aluminum lactate, aluminum oleate, aluminum bromate, aluminum borate, aluminum potassium sulfate, aluminum lithium sulfate, aluminum phosphate and mixtures thereof.

15. The method of claim 11, wherein the soluble lithium salt is selected from the group consisting of:

lithium hydroxide, lithium chloride, lithium sulfate, lithium nitrate, lithium iodide, lithium thiocyanate, lithium fluorosilicate, lithium dichromate, lithium chlorate, sodium lithiumate, lithium gluconate, lithium acetate, lithium benzoate, lithium citrate, lithium lactate, lithium formate, lithium bromate, lithium bromide, lithium fluoride, lithium fluosilicate, lithium silicate, lithium salicylate and mixtures thereof.

16. The method of claim 11, wherein the soluble silicate salt is selected from the group consisting of lithium metasilicate, sodium metasilicate, potassium metasilicate, sodium orthosilicate, potassium orthosilicate and mixtures thereof.

17. A solid detergent composition formed by the process comprising:

combining a glass corrosion inhibitor with an alkalinity source, wherein the glass corrosion inhibitor comprises soluble lithium salt, at least one of a soluble aluminum salt and a soluble silicate salt to form a mixture; and

forming a solid detergent composition from the mixture, wherein the solid detergent composition comprises between 0.1 and 2.5 wt % of the corrosion inhibitor,

wherein if a soluble aluminum salt is present, the soluble aluminum salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble salt of between about 410;

1 and about 1;

10, and

wherein if a soluble silicate salt is present, the soluble silicate salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble silicate salt to soluble lithium salt of between about 40;

1 and about 1;

40.

18. A use solution for washing glassware, the use solution comprising:

an alkalinity source; and

between about 0.01 ppm and about 300 ppm of a glass corrosion inhibitor comprising a soluble lithium salt and at least one of a soluble aluminum salt and a soluble silicate salt;

wherein the use solution has a pH of at least about 8, and

wherein if a soluble aluminum salt is present, the soluble aluminum salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble salt of between about 410;

1 and about 1;

10, and

wherein if a soluble silicate salt is present, the soluble silicate salt and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble silicate salt to soluble lithium salt of between about 40;

1 and about 1;

40.

19. The use solution of claim 18, wherein if a soluble aluminum salt and a soluble silicate salt are present, the soluble aluminum salt, the soluble silicate salt, and the soluble lithium salt are present in an amount sufficient to provide a weight ratio of soluble aluminum salt to soluble silicate salt to soluble lithium salt of between about 10:

40;

1 and about 4;

1;

40.

20. The use solution of claim 18, wherein the soluble aluminum salt is selected from the group consisting of:

sodium aluminate, potassium aluminate, aluminum bromide, aluminum chlorate, aluminum chloride, aluminum iodide, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum formate, aluminum tartrate, aluminum lactate, aluminum oleate, aluminum bromate, aluminum borate, aluminum potassium sulfate, aluminum lithium sulfate, aluminum phosphate and mixtures thereof.

21. The use solution of claim 18, wherein the soluble lithium salt is selected from the group consisting of:

lithium hydroxide, lithium chloride, lithium sulfate, lithium nitrate, lithium iodide, lithium thiocyanate, lithium fluorosilicate, lithium dichromate, lithium chlorate, sodium lithiumate, lithium gluconate, lithium acetate, lithium benzoate, lithium citrate, lithium lactate, lithium formate, lithium bromate, lithium bromide, lithium fluoride, lithium fluosilicate, lithium silicate, lithium salicylate and mixtures thereof.

22. The use solution of claim 18, wherein the soluble silicate salt is selected from the group consisting of:

lithium metasilicate, sodium metasilicate, potassium metasilicate, sodium orthosilicate, potassium orthosilicate and mixtures thereof.