High temperature rapid soil removal method
View Patent ↗A method of removing soil an article including the steps of immersing said article in an alkaline composition having a concentration of at least one source of alkalinity about 0.25% or higher, dehydrating the soil and rehydrating the soil at a pH which is neutral. The method is particularly useful for removing proteinaceous soil from processing equipment for dairy products.
1. A method for the removal of soil from an article having a soiled surface,the method comprising the steps of:
a) immersing said article in an alkaline composition having a concentration of at least one source of alkalinity of about 0.25% or higher;
b) dehydrating said soil by heating, by blowing air over the soiled surface or both at a temperature which is higher than ambient wherein the moisture content of the soil is reduced by about 10% to 100% of original moisture contact; and
c) rehydrating said soil with an aqueous composition at a pH which is about neutral.
2. The method of claim 1 wherein said source of alkalinity is an alkali metal hydroxide, an alkaline earth metal hydroxide, an alkylamine, an ethanolamine, an alkali metal carbonate or bicarbonate, a silicate, or a mixture thereof.
3. The method of claim 1 wherein said source of alkalinity is sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, ammonium hydroxide, or a mixture thereof.
4. The method of claim 1 wherein step c) results in swelling of the soil.
5. The method of claim 1 wherein said alkaline composition further comprises at least one surfactant or chelating agent.
6. The method of claim 5 wherein said surfactant is selected from the group consisting of nonionic, anionic, cationic, amphoteric, zwitterionic surfactants and mixtures thereof.
7. The method of claim 5 wherein said at least one surfactant is selected from the group consisting of amines, amine oxides, linear alcohol alkoxylates, capped alcohol alkoxylates, phosphate esters, phosphates, phosphonates, sulfates, sulfonates, quaternary ammonium compounds, alkylpolyglycosides, alkanolamides, copolymers of ethylene oxide and propylene oxide, betaines, modified carboxylates, sulfosuccinates, and mixtures thereof.
8. The method of claim 5 wherein said at least one chelating agent is selected from the group consisting of an aminocarboxylic acid, a condensed phosphate, a phosphonate, a polyacrylate, an iminodiacetic acid, and mixtures thereof.
9. The method of claim 5 wherein said at least one chelating agent is ethylenediaminetretracetic acid (EDTA), n-hydroxyethyliminodiacetic acid, nitrilotriacetic acid (NTA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), diethylenetriaminepentaacetic acid (DTPA), sodium and potassium orthophosphate, sodium and potassium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, aminotris(methylene phosphonic acid), hydroxyethylidene diphosphonic acid, ethylenediaminetetrae(methylene phosphonic acid), diethylenetriaminepente(methylene phosphonic acid), polyacrylic acid, polymethacrylic acid, acrylic acid-methacrylic acid copolymers, hydrolyzed polyacrylamide, hydrolyzed polymethacrylamide, hydrolyzed polyamide-methacrylamide copolymers, hydrolyzed polyacrylonitrile, hydrolyzed polymethacrylonitrile, hydrolyzed acrylonitrile-methacrylonitrile copolymers, and mixtures thereof.
10. The method of claim 1 wherein said alkaline composition further comprises at member selected from the group consisting of solvents, oxidizing agents, reducing agents, water hardness controlling agents, urea, bleaching agents, enzymes, and mixtures thereof.
11. The method of claim 10 wherein said alkaline composition further comprises at least one solvent selected from the group consisting of glycol ethers, alcohols, soy methyl ester, acetates, cyclic acids, and mixtures thereof.
12. The method of claim 1 wherein said drying step is at a temperature between about 15° C. to about 200° C.
13. The method of claim 1 wherein said alkaline composition has a pH of about 10 or higher.
14. The method of claim 1 wherein said drying temperature is about 70° C. to about 100° C. for about 10 minutes to about 20 minutes.
15. The method of claim 1 wherein said rehydrating step is at a temperature of about 20° C. to about 90° C.
16. The method of claim 1 wherein said aqueous composition for rehydrating comprises at least one member selected from the group consisting of surfactants, solvents, oxidizing agents, reducing agents, water hardness controlling agents, urea, bleaching agents, enzymes, and mixtures thereof.
17. The method of claim 1 wherein said soil is proteinaceous.
18. The method of claim 1 wherein said soil is milk soil.
19. The method of claim 1 wherein said article is food or beverage processing equipment.
20. The method of claim 1 wherein said article is processing equipment for dairy products.
21. The method of claim 1 wherein said article is a cheese vat, fast-food milkshake machine, pasteurizer, whey evaporator, permeate evaporator, ultra-high temperature dairy processing equipment, or a mixing vessel used to make dairy-based products that require heating.