WO2012155986A1 - Dishwashing process comprising a basic and acidic cleaning step - Google Patents

Dishwashing process comprising a basic and acidic cleaning step Download PDF

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Publication number
WO2012155986A1
WO2012155986A1 PCT/EP2011/058194 EP2011058194W WO2012155986A1 WO 2012155986 A1 WO2012155986 A1 WO 2012155986A1 EP 2011058194 W EP2011058194 W EP 2011058194W WO 2012155986 A1 WO2012155986 A1 WO 2012155986A1
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WO
WIPO (PCT)
Prior art keywords
preferred
cleaning
cleaning solution
tableware
acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2011/058194
Other languages
French (fr)
Inventor
Christoph MAUL
Dirk Kullwitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecolab Inc
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Ecolab Inc
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Filing date
Publication date
Application filed by Ecolab Inc filed Critical Ecolab Inc
Priority to PCT/EP2011/058194 priority Critical patent/WO2012155986A1/en
Priority to PCT/EP2012/058933 priority patent/WO2012156369A1/en
Publication of WO2012155986A1 publication Critical patent/WO2012155986A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/042—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/044—Hydroxides or bases
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/06—Phosphates, including polyphosphates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3409—Alkyl -, alkenyl -, cycloalkyl - or terpene sulfates or sulfonates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/06—Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/10—Salts
    • C11D7/16—Phosphates including polyphosphates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/265—Carboxylic acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/34—Organic compounds containing sulfur
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4236—Arrangements to sterilize or disinfect dishes or washing liquids
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/20—Other treatments, e.g. dry cleaning
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/40—Specific cleaning or washing processes
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/40—Specific cleaning or washing processes
    • C11D2111/44—Multi-step processes

Definitions

  • Dishwashing process comprising a basic and acidic cleaning step
  • This invention relates generally to the field of machine dishwashing processes, e.g. for cleaning tableware or other surfaces soiled with food remains. More particular this invention relates to field of continuous or discontinuous machine dishwashing processes in single or multi-tank dish machines.
  • Dish washing machines especially industrial dish washing machines are known in the field.
  • dish washing methods are known in which basic cleaning steps are altered with acidic cleaning steps, e.g. from the EP 1 477 552 Al which is hereby incorporated by reference. These washing methods have been described to be effective against starch deposits.
  • a process for continuous or discontinuous machine dishwashing comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,6 and ⁇ 10,9 b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ⁇ 1 and ⁇ 2 c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,5 and ⁇ 13
  • a process for continuous or discontinuous machine dishwashing comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,6 and ⁇ 10,9 b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ⁇ 1 and ⁇ 2 c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,5 and ⁇ 13
  • the cleaning solution has a pH of ⁇ 10,6 and 10,9.
  • step c) the cleaning solution has a pH of >11 and 12,5.
  • step a) is performed at a temperature of ⁇ 30°C and ⁇ 70°C
  • step b) is performed at a temperature of ⁇ 55°C and ⁇ 85°C
  • step c) is performed at a temperature of ⁇ 30°C and ⁇ 70°C
  • step a) is performed for ⁇ 8s and ⁇ 60s.
  • step b) is performed for ⁇ 10s and ⁇ 20s.
  • step c) is performed for ⁇ 20s and ⁇ 60s.
  • Step a) First alkaline cleaning step
  • Step a) is the first alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 10,6 and ⁇ 10,9.
  • This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
  • the cleaning solution used in step a) may include one or more of the following ingredients:
  • the cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
  • Step a) is performed at a temperature of ⁇ 30 and ⁇ 70°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step a) is performed at a temperature of ⁇ 40 and ⁇ 65°C, yet more preferred ⁇ 50 and ⁇ 60°C Step a) preferably is performed for ⁇ 8s and ⁇ 60s, more preferred for ⁇ 20s and ⁇ 30s. However, it should be noted that the duration of step a) is not limiting for the invention, only for some preferred applications within the same.
  • Step b) Acidic cleaning step
  • Step b) is the acidic cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 1 and ⁇ 2. This pH can be achieved e.g. by using an inorganic or organic acid.
  • Suitable acidic compounds in the context of this invention which are insofar preferred are sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, propanoic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkanesulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof and, in a most particularly embodiment, from formic acid, glycolic acid, gluconic acid, amidosulfonic acid or the alkanesulfonic acids, more particularly methanesulfonic acid or mixtures thereof. Especially preferred is methanesulfonic acid.
  • the cleaning solution used in step b) may include one or more of the following ingredients:
  • the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) .
  • the tableware is not intentionally sprayed during the contact time.
  • the cleaning solution is sprayed onto the tableware as a fine, gentle mist-like liquid spray.
  • the cleaning solution is applied to the tableware as foam.
  • the cleaning solution is applied to the tableware in droplet form or by the Ecolab process known commercially as thin film cleaning (TFC) .
  • Step b) is performed at a temperature of ⁇ 55 and ⁇ 85°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ⁇ 60 and ⁇ 80°C and
  • Step b) preferably is performed for ⁇ 10s and ⁇ 20s.
  • the duration of step b) is not limiting for the invention, only for some preferred applications within the same.
  • Step c) is the second alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 10,5 and ⁇ 13, preferably ⁇ 10,6 and ⁇ 10,9. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
  • the cleaning solution used in step a) may include one or more of the following ingredients:
  • the cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
  • Step c) is performed at a temperature of ⁇ 30 and ⁇ 70°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step c) is performed at a temperature of ⁇ 40 and ⁇ 65°C, yet more preferred ⁇ 50 and ⁇ 60°C
  • Step c) preferably is performed for ⁇ 20s and ⁇ 60s, more preferred ⁇ 45s and ⁇ 55s.
  • the duration of step c) is not limiting for the invention, only for some preferred applications within the same.
  • the process furthermore comprises a step d) being a neutral rinsing step. This embodiment will be described in more detail later on.
  • Step d) is the neutral rinsing step in the context of the invention and is performed using a rinse aid solution having a pH of ⁇ 5 and ⁇ 7.
  • the rinse aid solution used in step d) may include one or more of the following ingredients:
  • the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) , as it step d) usually is the last step in the dishwashing cycle.
  • the tableware is not intentionally sprayed during the contact time.
  • Step d) is performed at a temperature of ⁇ 55 and ⁇ 85°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ⁇ 60 and ⁇ 80°C.
  • Step d) preferably is performed for ⁇ 5s and ⁇ 15s, preferably ⁇ 9s and ⁇ 12s.
  • the duration of step d) is not limiting for the invention, only for some preferred applications within the same.
  • the afore mentioned components, as well as the claimed components and the components to be used in accordance with the invention in the described embodiments, are not subject to any special exceptions with respect to their size, shape, material selection and technical concept such that the selection criteria known in the pursuant field can be applied without a limitation.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Detergent Compositions (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

The present invention relates to a process for cleaning tableware using a basic cleaning step followed by an acidic cleaning step, boths steps having a defined small pH-interval.

Description

Dishwashing process comprising a basic and acidic cleaning step
Technical field of the invention This invention relates generally to the field of machine dishwashing processes, e.g. for cleaning tableware or other surfaces soiled with food remains. More particular this invention relates to field of continuous or discontinuous machine dishwashing processes in single or multi-tank dish machines.
Background of the invention
Dish washing machines, especially industrial dish washing machines are known in the field. In this context dish washing methods are known in which basic cleaning steps are altered with acidic cleaning steps, e.g. from the EP 1 477 552 Al which is hereby incorporated by reference. These washing methods have been described to be effective against starch deposits.
However, there is a constant need for improved dish washing processes to further increase the efficiency of cleaning tableware, especially tableware having starch deposited on it.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a dishwashing process which allows an efficient cleaning of tableware, especially of tableware having starch deposits.
This object is solved by a process according to Claim 1. Accordingly, a process for continuous or discontinuous machine dishwashing is provided, comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ≥10,6 and ≤10,9 b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ≥1 and ≤2 c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13 Surprisingly it has been found that such a process has for a wide range of applications within the present invention at least one of the following advantages:
By using this process it is possible to reach a satisfying cleaning result, especially concerning the removal of starch
By using this process it is possible to operate without periodical stripping processes of the ware to remove long term starch build up.
By using this process the cleaning result and finish of glass and stainless steel ware is improved . By using this process it is possible to operate without periodical de-liming of the process equipment .
By using this process the pH value of the process water to be disposed will be reduced to a more favourable value.
According to a preferred embodiment of the invention in step c) the cleaning solution has a pH of ≥10,6 and 10,9.
Alternatively, according to a preferred embodiment of the invention in step c) the cleaning solution has a pH of >11 and 12,5. According to a preferred embodiment of the invention, step a) is performed at a temperature of ≥30°C and ≤70°C
According to a preferred embodiment of the invention, step b) is performed at a temperature of ≥55°C and ≤85°C
According to a preferred embodiment of the invention, step c) is performed at a temperature of ≥30°C and ≤70°C
According to a preferred embodiment of the invention, step a) is performed for ≥8s and ≤60s.
According to a preferred embodiment of the invention, step b) is performed for ≥10s and ≤20s. According to a preferred embodiment of the invention, step c) is performed for ≥20s and ≤60s. In the following the three steps of the invention are described in more detail:
Step a) : First alkaline cleaning step
Step a) is the first alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥10,6 and ≤10,9. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
Furthermore the cleaning solution used in step a) may include one or more of the following ingredients:
- Complexing agents, Chelants, Builders
- Surfactants
- Corrosion inhibitors
- Processing additives The cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
According to a preferred embodiment of the present invention, Step a) is performed at a temperature of ≥30 and ≤70°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step a) is performed at a temperature of ≥40 and ≤65°C, yet more preferred ≥50 and ≤60°C Step a) preferably is performed for ≥8s and ≤60s, more preferred for ≥20s and ≤30s. However, it should be noted that the duration of step a) is not limiting for the invention, only for some preferred applications within the same. Step b) : Acidic cleaning step
Step b) is the acidic cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥1 and ≤2. This pH can be achieved e.g. by using an inorganic or organic acid.
Suitable acidic compounds in the context of this invention which are insofar preferred are sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, propanoic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkanesulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof and, in a most particularly embodiment, from formic acid, glycolic acid, gluconic acid, amidosulfonic acid or the alkanesulfonic acids, more particularly methanesulfonic acid or mixtures thereof. Especially preferred is methanesulfonic acid. Furthermore the cleaning solution used in step b) may include one or more of the following ingredients:
- Surfactants
- Hydrotropes
- Stabilizer
- Processing additives In a preferred embodiment of the process according to the invention, the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) .
In another preferred embodiment, the tableware is not intentionally sprayed during the contact time.
Alternatively or additionally, the cleaning solution is sprayed onto the tableware as a fine, gentle mist-like liquid spray.
Alternatively or additionally, the cleaning solution is applied to the tableware as foam.
Alternatively or additionally, the cleaning solution is applied to the tableware in droplet form or by the Ecolab process known commercially as thin film cleaning (TFC) . According to a preferred embodiment of the present invention, Step b) is performed at a temperature of ≥55 and ≤85°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ≥60 and <80°C and
Step b) preferably is performed for ≥10s and ≤20s. However, it should be noted that the duration of step b) is not limiting for the invention, only for some preferred applications within the same.
Step c) : Second alkaline cleaning step Step c) is the second alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥10,5 and ≤13, preferably ≥10,6 and ≤10,9. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
Furthermore the cleaning solution used in step a) may include one or more of the following ingredients:
- Complexing agents, Chelants, Builders
- Surfactants
- Corrosion inhibitors
- Processing additives
The cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
According to a preferred embodiment of the present invention, Step c) is performed at a temperature of ≥30 and ≤70°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step c) is performed at a temperature of ≥40 and ≤65°C, yet more preferred ≥50 and ≤60°C
Step c) preferably is performed for ≥20s and ≤60s, more preferred ≥45s and ≤55s. However, it should be noted that the duration of step c) is not limiting for the invention, only for some preferred applications within the same. According to a further preferred embodiment of the present invention, the process furthermore comprises a step d) being a neutral rinsing step. This embodiment will be described in more detail later on.
Step d) is the neutral rinsing step in the context of the invention and is performed using a rinse aid solution having a pH of ≥5 and ≤7. The rinse aid solution used in step d) may include one or more of the following ingredients:
- Surfactants
- Organic and/or inorganic acids
- Auxiliaries
- Hydrotropes
- Processing additives
In a preferred embodiment of the process according to the invention, the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) , as it step d) usually is the last step in the dishwashing cycle.
In another preferred embodiment, the tableware is not intentionally sprayed during the contact time.
According to a preferred embodiment of the present invention, Step d) is performed at a temperature of ≥55 and ≤85°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ≥60 and <80°C.
Step d) preferably is performed for ≥5s and ≤15s, preferably ≥9s and ≤12s. However, it should be noted that the duration of step d) is not limiting for the invention, only for some preferred applications within the same. The afore mentioned components, as well as the claimed components and the components to be used in accordance with the invention in the described embodiments, are not subject to any special exceptions with respect to their size, shape, material selection and technical concept such that the selection criteria known in the pursuant field can be applied without a limitation.
The particular combinations of elements and features in the above detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this and the patents/applications incorporate by reference are also expressly contemplated. As those skilled in the art will recognize, variations, modifications, and other implementations of what is described herein can occur to those of ordinary skill in the art without departing from the spirit and the scope of the invention as claimed. Accordingly, the foregoing description is by the way of example only and is not intending as limiting. In the claims, the wording "comprising" does not exclude other elements or steps, and the identified article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures can not be used to advantage. The inventions scope is defined in the following claims and the equivalents thereto. Furthermore, reference signs used in the description and claims do not limit the scope of the invention as claimed .

Claims

Claims
1.
A process for continuous or discontinuous
dishwashing comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ≥10,6 and ≤10,9. b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ≥1 and ≤2 c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13
2.
The process according to claim 1, whereby in step c) the cleaning solution has a pH of ≥10,6 and ≤10,9
3.
The process according to claim 1, whereby in step c) the cleaning solution has a pH of ≥11 and ≤12,5
4.
The process according to any of the claims 1 to 3, wherein step a) is performed at a temperature of ≥30°C and <70°C
5.
The process according to any of the claims 1 to 4, wherein step b) is performed at a temperature of ≥55°C and <85°C
6.
The process according to any of the claims 1 to 5, wherein step c) is performed at a temperature of ≥30°C and <70°C
7.
The process according to any of the claims 1 to 6, wherein step a) is performed for ≥8s and ≤60s
8.
The process according to any of the claims 1 to 7, wherein step b) is performed for ≥10s and ≤20s.
The process according to any of the claims 1 to 8, wherein step c) is performed for ≥20s and ≤60s.
PCT/EP2011/058194 2011-05-19 2011-05-19 Dishwashing process comprising a basic and acidic cleaning step Ceased WO2012155986A1 (en)

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US8871699B2 (en) 2012-09-13 2014-10-28 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US9023784B2 (en) 2012-09-13 2015-05-05 Ecolab Usa Inc. Method of reducing soil redeposition on a hard surface using phosphinosuccinic acid adducts
US9752105B2 (en) 2012-09-13 2017-09-05 Ecolab Usa Inc. Two step method of cleaning, sanitizing, and rinsing a surface
US9994799B2 (en) 2012-09-13 2018-06-12 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US11865219B2 (en) 2013-04-15 2024-01-09 Ecolab Usa Inc. Peroxycarboxylic acid based sanitizing rinse additives for use in ware washing
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US10377971B2 (en) 2012-09-13 2019-08-13 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US11001784B2 (en) 2012-09-13 2021-05-11 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US9670434B2 (en) 2012-09-13 2017-06-06 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US9752105B2 (en) 2012-09-13 2017-09-05 Ecolab Usa Inc. Two step method of cleaning, sanitizing, and rinsing a surface
US9994799B2 (en) 2012-09-13 2018-06-12 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US10358622B2 (en) 2012-09-13 2019-07-23 Ecolab Usa Inc. Two step method of cleaning, sanitizing, and rinsing a surface
US9023784B2 (en) 2012-09-13 2015-05-05 Ecolab Usa Inc. Method of reducing soil redeposition on a hard surface using phosphinosuccinic acid adducts
US12371639B2 (en) 2012-09-13 2025-07-29 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US8871699B2 (en) 2012-09-13 2014-10-28 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US11859155B2 (en) 2012-09-13 2024-01-02 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US11053458B2 (en) 2012-09-13 2021-07-06 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US11952556B2 (en) 2012-09-13 2024-04-09 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use
US12337073B2 (en) 2013-04-15 2025-06-24 Ecolab Usa Inc. Peroxycarboxylic acid based sanitizing rinse additives for use in ware washing
US11865219B2 (en) 2013-04-15 2024-01-09 Ecolab Usa Inc. Peroxycarboxylic acid based sanitizing rinse additives for use in ware washing
US12134114B2 (en) 2018-11-15 2024-11-05 Ecolab Usa Inc. Acidic cleaner

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