EP1567289B2 - Procede de nettoyage acide pour lavage de vaisselle en machine - Google Patents

Procede de nettoyage acide pour lavage de vaisselle en machine Download PDF

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Publication number
EP1567289B2
EP1567289B2 EP03772309.5A EP03772309A EP1567289B2 EP 1567289 B2 EP1567289 B2 EP 1567289B2 EP 03772309 A EP03772309 A EP 03772309A EP 1567289 B2 EP1567289 B2 EP 1567289B2
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EP
European Patent Office
Prior art keywords
acid
cleaning solution
tableware
aqueous cleaning
acidic
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.)
Expired - Lifetime
Application number
EP03772309.5A
Other languages
German (de)
English (en)
Other versions
EP1567289A1 (fr
EP1567289B1 (fr
Inventor
Werner Strothoff
Heiko Faubel
Helmut Maier
Winfried Troll
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
Original Assignee
Ecolab Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Ecolab Inc filed Critical Ecolab Inc
Publication of EP1567289A1 publication Critical patent/EP1567289A1/fr
Application granted granted Critical
Publication of EP1567289B1 publication Critical patent/EP1567289B1/fr
Publication of EP1567289B2 publication Critical patent/EP1567289B2/fr
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Classifications

    • 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
    • C11D7/22—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
    • 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
    • C11D2111/44—Multi-step processes

Definitions

  • This invention relates to a machine dishwashing process for cleaning tableware or other surfaces soiled with food remains. More particularly, the object of the invention is to improve the continuous or discontinuous process of machine dishwashing which may be carried out both in single-tank and in multi-tank machines.
  • the wash liquor usually consists of water with a temperature of about 50°C to 65°C to which a cleaner is added.
  • detergents in powder or liquid form for example, are added to the water, so that about 0.1 to 0.3% by weight of active washing substances are present in the cleaning solution.
  • the resulting wash liquor is usually sprayed on to the articles to be cleaned through differently arranged nozzles.
  • the soil on the tableware is thus removed or at least swollen or softened and partially dissolved.
  • the wash liquor is rinsed off.
  • the rinse water usually consists of fresh water and a rinse agent, which generally ensures that only a very thin film of water is left on the tableware and can drain off or evaporate in following drying zones.
  • institutional dishwashing machines usually comprise several tanks arranged in succession, from which rinse and wash liquor is sprayed onto the tableware to be cleaned as it passes through the machine.
  • the tanks are generally arranged on the cascade principle, the rinse and wash liquor passing successively through the tanks from the outlet end to the inlet end of the tableware.
  • Fresh water is generally fed into the machines at the outlet end.
  • the required amount of detergent is dosed into at least one wash tank also known as the dosing tank.
  • the dosing of detergent normally takes place automatically depending on the conductivity or the pH of the wash liquor or optionally by means of a dosing pump controlled by a timer or clock. Several components may also be separately dosed.
  • a basic lye solution based on an aqueous alkali metal hydroxide solution may be introduced first.
  • one or more additives may be added to this basic solution. Normally, the dosage of these additives is either proportional to the addition of the basic lye or is controlled by a timer. If desired, the additives may be dosed according to the advance cycle of the chain carrying the tableware to be washed through the machine. In addition, additives can also be dosed or the additive concentration increased by determining the amount of additive in the basic lye by sensory detection of a tracer present in the additive.
  • EP 282 214 attempts to solve the problem by spraying a highly concentrated cleaning formulation onto the soiled articles, followed by a contact phase, after which the cleaning solution and soil are removed in one or more following steps.
  • EP 282 214 mentions reducing pollution of the wastewater as an essential aim of the invention.
  • an essential aspect of the pollution of wastewater was not taken into account.
  • the wastewater In the treatment of wastewater, it is usually imperative for the wastewater to have a certain pH before or during treatment in corresponding treatment plants. This pH is generally close to the neutral point of water according to the nature of the treatment.
  • there are even country-specific wastewater regulations which stipulate a particular pH for wastewater. All this means is that more chemicals have to added to neutralize strongly acidic or strongly alkaline wastewater before further treatment.
  • EP 282 214 takes no account at all of this problem.
  • alkaline detergents are mentioned and recommended.
  • the cleaning agents to be used are explicitly discussed.
  • column 3, line 24 it is disclosed that, for example, alternately spraying with high alkalinity and then with lower alkalinity could have advantages.
  • oxidizing agents such as hypochlorite
  • water treatment substances such as NTA for example
  • various substances are known to improve penetration and to help soften and remove the soil.
  • EP 282 214 A1 states that a basic formulation will typically contain an alkalinity source and a sequestrant source. On the bases of formulations such as these, it is possible to cater for special problems such as, for example, tea stains or other residues which may be found on tableware.
  • WO 02/31095 A1 describes a detergent composition and a method for ware-washing in which an acidic rinse is used in a mechanical dishwashing process to obtain a better soil release effect.
  • an acidic component is dosed into the post-wash rinse zone or the post-wash rinse step.
  • Example 1 of the WO 02/31095 A1 describes a pre-treatment of ceramic dishes with an acidic rinse product. After this process the dishes were rinsed and soiled.
  • a disadvantage of this process is that a pre-treatment of the ceramic dishes is necessary which makes the whole cleaning process more complex.
  • the problem addressed by the present invention was to provide a process which, firstly, would solve the cleaning problem posed by EP 282 214 without the need for thorough cleaning.
  • the problem addressed by the invention was to minimize the time and effort involved in neutralization before or during treatment in wastewater treatment plants. At the same time, care would be taken where possible to ensure that applicational requirements with regard to equipment and other factors would be satisfied.
  • the present invention relates to a process for continuous or discontinuous machine dishwashing, in which the tableware is treated at least in one process step with an acidic cleaning solution and, in another process step, with an alkaline cleaning solution, comprising the steps of
  • the acidic cleaning solution mentioned contains one or more acids selected from the mineral and/or organic acids.
  • at least one acid is present which is selected from 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.
  • the aqueous acidic cleaning solution to be sprayed on in accordance with the invention preferably contains as further components a corrosion inhibitor and/or a typical complexing agent which, in a particularly preferred embodiment, is selected from the phosphonic acids, more particularly dioctyl phosphonic acid.
  • the acidic cleaning solution contains between 0.01 and 10% by weight of one or more detersive substances, based on the cleaning solution.
  • the acidic cleaning solution mentioned contains less than 0.9% by weight, more particularly less than 0.8% by weight and, in a most particularly preferred embodiment, less than 0.5% by weight of one or more detersive substances, based on the cleaning solution.
  • weakly acidic cleaning solutions with an active acid content of less than 0.9% by weight, preferably less than 0.8% by weight and more particularly less than 0.5% by weight.
  • weakly acidic cleaning solutions may also have the advantage that the consumption of the lye baths into which the possibly acidic solution is carried over is not too high.
  • the acidic aqueous cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops), the contact time preferably being 2 to 100 seconds, more preferably 5 to 100 seconds and most preferably 8 to 25 seconds.
  • the tableware is not intentionally sprayed during the contact time.
  • the acidic aqueous cleaning solution is sprayed onto the tableware as a fine, gentle mist-like liquid spray.
  • the acidic cleaning solution is applied to the tableware as foam.
  • the cleaning solution could also be applied to the tableware in droplet form or by the Ecolab process known commercially as thin film cleaning (TFC).
  • Another preferred embodiment of the process according to the invention is characterized in that the treatment with the acidic cleaning solution is preceded by an alkaline treatment of the tableware of which the pH above 10. The treatment with the acidic cleaning solution is followed by an alkaline treatment of the tableware.
  • the alkaline step taking place earlier in the process sequence - in a particularly preferred embodiment - has a lower pH than the alkaline step taking place later in the process sequence. This is advantageous in order to minimize consumption in an acidic step taking place between the two alkaline steps mentioned.
  • the tableware comes into contact with one or more aqueous cleaning solutions containing between 0.1 and 4% by weight of an alkali carrier, preferably a hydroxide selected from sodium hydroxide, potassium hydroxide or mixtures thereof.
  • an alkali carrier preferably a hydroxide selected from sodium hydroxide, potassium hydroxide or mixtures thereof.
  • alkali carriers - in addition to or instead of hydroxides selected from sodium and potassium hydroxide - include, for example, alkali metal silicates, ethanolamines, such as triethanolamine, diethanolamine and monoethanolamine, and also alkali metal carbonates of an alkali carrier, preferably a hydroxide selected from sodium or potassium hydroxide.
  • alkali carriers may of course also be used because it is principally a matter of increasing the pH.
  • an institutional dishwashing machine comprising several tanks which are arranged adjacent one another in known manner on the cascade principle and from which rinse or wash liquor is sprayed onto the tableware and then drains back into the tanks, the tanks intended for one or more acidic cleaning steps in the operation of the process according to the invention being made of acid-resistant material and/or lined with acid-resistant material.
  • a single-tank washing machine for example a domestic dishwasher, which can be used in a process according to the invention and which is made of and/or lined with acid-resistant material, more particularly in the places where it comes in to contact with acidic cleaning solutions.
  • the process of the invention has the further advantage that mineralic deposits on glass and dishes, like lime deposits, which are soluble in acidic solution are removed.
  • Table 1 Cleaning results in tests to the described scheme, only the spray-on solution being varied from test to test.
  • Test Spray-on solution Evaluation of cleaning performance 1 (comparative) 1% NaOH 4.6 2 (comparative) 0.3 g/l Perzym ( enzyme-containing product) 1.2 3 0.4% methanesulfonic acid 9.0 4 0.7% by weight methanesulfonic acid 9.5 5 1 % by weight methanesulfonic acid 9.5 6 (comparative) Water 1.2
  • organic acids formic acid, glycolic acid, gluconic acid, amidosulfonic acid or other alkanesulfonic acids, more particularly with an alkane chain of 1 to 4 C atoms.
  • the conditions in the Meiko GSM dishwashing machine were as follows: As cleaner Perclin ® Intensiv wellssig (1,5 g/l; 3,2 mS/cm) was used. In the machine softened water in an amount of 500 l/h was used. The acid content was 1,4 to 1,5% phosphoric acid.
  • Table 2 shows the cleaning results dependant from the different pH-values in the different bars.
  • Table 2 pH-Value Cleaning Result Time Bath 1 Bath 2 Bath 3 Start 10,7 10,6 10,7 6 10 10,2 10,4 10,6 6 20 9,8 10,3 10,5 5,5 30 9,7 10,2 10,4 5,5 40 9,6 9,9 10,3 3,5 50 9,5 9,5 10,3 2 60 9,4 9,5 10,3 -

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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)
  • Cleaning By Liquid Or Steam (AREA)

Claims (14)

  1. Procédé pour le lavage de la vaisselle en machine, en continu ou en discontinu, dans lequel la vaisselle est traitée au moins dans une étape de traitement avec une solution nettoyante acide et, dans une autre étape de traitement, avec une solution nettoyante alcaline, comprenant les étapes suivantes:
    a) appliquer une solution nettoyante aqueuse acide avant le cycle de rinçage final ou la zone de rinçage final à la vaisselle au moins partiellement salie et
    b) éliminer la solution nettoyante aqueuse acide et les saletés dans une ou plusieurs étapes suivantes,
    le traitement alcalin ayant lieu avant et après le traitement acide et la solution alcaline et l'au moins une solution nettoyante aqueuse acide se neutralisant l'une l'autre au moins partiellement, et le pH des eaux usées produites par le procédé est inférieur à 12.
  2. Procéde selon la revendication 1, caractérisé en ce que la solution nettoyante aqueuse acide contient un ou plusieurs acides choisis parmi les acides minéraux et/ou organiques.
  3. Procédé selon la revedication 2, caractérisé en ce qu'au moins un acide est présent, lequel est choisi parmi l'acide sulfurique, l'acide nitrique, l'acide phosphorique, l'acide formique, l'acide acétique, l'acide propanoïque, l'acide glycolique, l'acide citrique, l'acide maléique, l'acide lactique, l'acide gluconique, un acide alcanesulfonique, l'acide amidosulfonique, l'acide succinique, l'acide glutarique, l'acide adipique, l'acide oxalique, l'acide benzoïque, les acides phosphoniques, les acides polyacryliques et leurs mélanges,
  4. Procédé selon la revendication 3, caractérisé en ce qu'au moins un acide est présent, lequel est choisi parmi l'acide formique, l'acide glycolique, l'acide gluconique, l'acide amidosulfonique et les acides alcanesulfoniques, plus particulièrement l'acide méthanesulfonique ou ses mélanges.
  5. Procédé selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que la solution nettoyante aqueuse acide contient entre 0,01 et 10 % en poids d'une ou plusieurs substances détersives, sur la base de la solution nettoyante.
  6. Procédé selon la revendication 5, caractérisé en ce que la solution nettoyante aqueuse acide contient moins de 0,9 % en poids, de préférence moins de 0,8 % en poids et plus particulièrement moins de 0,5 % en poids d'une ou plusieurs substances détersives, sur la base de la solution nettoyante.
  7. Procédé selon une ou plusieurs des revendications 1 à 6, caractérisé en ce que la solution nettoyante aqueuse acide est laissée à agir sur la vaisselle et les saletés pendant un certain temps de contact (durant lequel l'aspersion est stoppée), le temps de contact de cette solution nettoyante aqueuse avec la vaisselle étant de préférence de 2 à 100 secondes, mieux encore de 5 à 100 secondes et tout spécialement de 8 à 25 secondes.
  8. Procédé selon la revendication 7, caractérisé en ce que la vaisselle n'est pas aspergée intentionnellement durant le temps de contact.
  9. Procédé selon les revendications 1 à 8, caractérisé en ce que la solution nettoyante aqueuse acide est aspergée sur la vaisselle sous la forme d'une pulvérisation fine et légère de liquide, analogue à une brume.
  10. Procédé selon une ou plusieurs des revendications 1 à 8, caractérisé en ce que la solution nettoyante aqueuse acide est appliquée à la vaisselle sous la forme d'une mousse.
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce que la solution nettoyante aqueuse acide est appliquée par l'intermédiaire de buses adaptées.
  12. Procédé selon les revendications 1 à 11, caractérisé en ce qu'une solution nettoyante aqueuse ayant un pH supérieur à 10 est utilisée pour le traitement alcalin de la vaisselle avant l'étape de traitement acide.
  13. Procédé selon une ou plusieurs des revendications 1 à 12, caractérisé en ce que, durant le traitement alcalin, la vaisselle est mise en contact avec une ou plusieurs solutions nettoyantes aqueuses qui contiennent entre 0,1 et 4% en poids d'un support alcalin, de préférence un hydroxyde choisi parmi l'hydroxyde de sodium, l'hydroxyde de potassium et leurs mélanges.
  14. Procédé selon une ou plusieurs des revendications 1 à 13, caractérisé en ce que le pH des eaux usées produites par le procédé est inférieur à 11.
EP03772309.5A 2002-12-06 2003-11-06 Procede de nettoyage acide pour lavage de vaisselle en machine Expired - Lifetime EP1567289B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10257391 2002-12-06
DE10257391A DE10257391A1 (de) 2002-12-06 2002-12-06 Saure Reinigung II
PCT/EP2003/012366 WO2004052564A1 (fr) 2002-12-06 2003-11-06 Procede de nettoyage acide pour lavage de vaisselle en machine

Publications (3)

Publication Number Publication Date
EP1567289A1 EP1567289A1 (fr) 2005-08-31
EP1567289B1 EP1567289B1 (fr) 2007-05-23
EP1567289B2 true EP1567289B2 (fr) 2017-06-07

Family

ID=32336137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03772309.5A Expired - Lifetime EP1567289B2 (fr) 2002-12-06 2003-11-06 Procede de nettoyage acide pour lavage de vaisselle en machine

Country Status (7)

Country Link
EP (1) EP1567289B2 (fr)
AT (1) ATE362807T2 (fr)
AU (1) AU2003279362B2 (fr)
BR (1) BR0316171A (fr)
CA (1) CA2502423C (fr)
DE (2) DE10257391A1 (fr)
WO (1) WO2004052564A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024164162A1 (fr) * 2023-02-08 2024-08-15 Ecolab Usa Inc. Procédé de désinfection de vaisselle par voie caustique à basse température

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US8092613B2 (en) 2002-05-31 2012-01-10 Ecolab Usa Inc. Methods and compositions for the removal of starch
WO2005068598A1 (fr) * 2003-12-18 2005-07-28 Ecolab Inc. Procedes et compositions pour l'elimination d'amidon
US8426349B2 (en) * 2009-05-26 2013-04-23 Delaval Holding Ab Chlorinated alkaline pipeline cleaner with methane sulfonic acid
DE102011017294A1 (de) 2011-04-15 2012-10-18 Meiko Maschinenbau Gmbh & Co. Kg Transportspülmaschine mit Sonderbehandlungszonen
BR112013028007A2 (pt) * 2011-05-20 2017-01-10 Ecolab Usa Inc detergentes não-fosfato e ácidos não-fosfóricos em um sistema alternado alcalinidade/acidez para a lavagem de louça
CA2856820C (fr) 2011-05-20 2019-10-29 Ecolab Usa Inc. Formulations acides destinees a etre utilisees dans un systeme de nettoyage d'articles manufactures
JP6140184B2 (ja) 2011-12-13 2017-05-31 エコラボ ユーエスエー インコーポレイティド ドアタイプの食器洗浄機内でケミストリを分離する方法
JP6014163B2 (ja) 2011-12-13 2016-10-25 エコラボ ユーエスエー インコーポレイティド 濃縮物品洗浄組成物及び方法
AU2016258892B2 (en) * 2015-05-07 2020-03-19 Diversey, Inc. Container washing and detergent for use thereof

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DE3532552A1 (de) * 1985-09-12 1987-03-12 Henkel Kgaa Verfahren zum einstellen eines ph-bereichs im abwasser und einrichtung zum durchfuehren des verfahrens
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024164162A1 (fr) * 2023-02-08 2024-08-15 Ecolab Usa Inc. Procédé de désinfection de vaisselle par voie caustique à basse température

Also Published As

Publication number Publication date
DE10257391A1 (de) 2004-06-24
ATE362807T2 (de) 2007-06-15
EP1567289A1 (fr) 2005-08-31
DE60314007T3 (de) 2017-10-12
CA2502423A1 (fr) 2004-06-24
WO2004052564A1 (fr) 2004-06-24
EP1567289B1 (fr) 2007-05-23
AU2003279362B2 (en) 2009-03-12
BR0316171A (pt) 2005-09-27
CA2502423C (fr) 2010-08-03
DE60314007T2 (de) 2008-01-24
DE60314007D1 (de) 2007-07-05
AU2003279362A2 (en) 2004-06-30
AU2003279362A1 (en) 2004-06-30

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