EP1027420B1 - Cleaning in the food industry - Google Patents

Cleaning in the food industry Download PDF

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Publication number
EP1027420B1
EP1027420B1 EP98930039A EP98930039A EP1027420B1 EP 1027420 B1 EP1027420 B1 EP 1027420B1 EP 98930039 A EP98930039 A EP 98930039A EP 98930039 A EP98930039 A EP 98930039A EP 1027420 B1 EP1027420 B1 EP 1027420B1
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EP
European Patent Office
Prior art keywords
agent
rinsing
cleaning
acid
aluminium
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
EP98930039A
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German (de)
English (en)
French (fr)
Other versions
EP1027420A1 (en
Inventor
Tord Georg Eriksson
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Individual
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Individual
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Publication of EP1027420A1 publication Critical patent/EP1027420A1/en
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Publication of EP1027420B1 publication Critical patent/EP1027420B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/88—Ampholytes; Electroneutral compounds
    • C11D1/94—Mixtures with anionic, cationic or non-ionic compounds
    • 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
    • C11D3/39—Organic or inorganic per-compounds
    • C11D3/3947—Liquid compositions
    • C11D2111/20—
    • C11D2111/44—

Definitions

  • Packing machines with many details made of aluminium and/or brass are common. When such machines are used for food products of different kinds their cleaning and disinfection is a very complicated problem, which, so far, has no satisfying solution. The same is true for very large parts of other food handling equipment, especially when the operators come in direct skin contact with surfaces where food is handled.
  • Construction material of the aluminium and brass type, excludes strong alkaline cleaning agents.
  • additives containing silicates, are used to increase the resistance of aluminium against alkali.
  • Silicates may cause precipitates that may endanger the mechanical function of the machine, and also create growth beds for micro organisms. Such growth points are usually very difficult to get to.
  • Chlorine and other usual disinfection agents give unacceptable discharges and may influence the food negatively.
  • Strong acid which is used for instance in the so-called "alternating dish washing system" is excluded due to corrosion risks, which does not just damage the equipment, but also means an environmental danger as heavy metals are set free.
  • the first component is an alkaline composition.
  • the second one is an acid composition.
  • an active per-oxygen species is present in the alkaline or the acid composition.
  • This expression is very vague in its character. It could comprise many different chemical compounds.
  • the description, (column 3, line 5 to 9) confirms that a reaction product of a water containing per-oxygen solution and an inorganic carboxylic acid with 1 to 6 carbon atoms, for instance acetic acid, is meant. This shows that the wording "active per-oxygen species" should be interpreted as what is usually called activated hydrogen peroxide, in contrast to non-activated hydrogen peroxide.
  • the main component of the alkaline composition is an alkali metal hydroxide. This gives a pH far above what is acceptable for use on aluminium.
  • the main component in the acid composition is phosphoric acid. The concentration is high. This gives a pH level far below what is acceptable for aluminium and brass. In passing, it is said that the phosphoric acid may be replaced by another acid compatible with the hydrogen peroxide compound. No examples at all are given of such an acid. The wording seems to imply that another strong, inorganic acid is intended. None in this publication can be interpreted to give guidance at the recipe work for compositions that could be used for the cleaning of mechanical constructions with aluminium and/or brass components.
  • PCT/EP96/05783 concerns an alkaline composition without disinfection agent and an acid composition with a disinfection agent chosen among anionic surface active agents, fatty acids, alkyl phosphonic acids and ether-carboxylic acids or their mixtures. Special emphasis is given to the fact that the compositions should be free from halogens, halogen compound, alkyl amines, quaternary ammonium compounds, quaternary phosphonium compounds, per acids and aldehydes.
  • a disinfection agent chosen among anionic surface active agents, fatty acids, alkyl phosphonic acids and ether-carboxylic acids or their mixtures.
  • the examples refer to compositions, in which the main components are sodium hydroxide respectively phosphoric acid.
  • the compositions of the examples are completely unfit for the purpose of this application. No guidance for adaptation in this direction can be found.
  • Aluminium is a base metal and is easily corroded by acids and alkali. Nevertheless, it is a highly favoured construction material, due to its excellent qualities regarding shaping etc. and the fact that it may be made passive by the formation of a tight adhering layer of aluminium oxide.
  • This layer is automatically formed in environments rich in oxygen. It may be further reinforced by for instance anodizing.
  • the stability of the protection layer depends on the reactivity of the aluminium oxide in the surroundings, where aluminium is used. If aluminium oxide can react with the surrounding media under formation of soluble compounds, the protection layer is destroyed. If the new compounds that may be formed are even less soluble than the aluminium oxide and have equal or better qualities regarding the formation of a tight layer with good adherence the protection layer is reinforced.
  • the passivity range of pure aluminium is comparative small and lays in principle between pH 4 and 8.5 at the redox potentials one normally expects in water solutions. Aluminium for construction details is usually alloyed. One criterion for choosing the alloy metals is its tendency to form a stronger protective layer. For practical purposes the passivity range has wider limits than mentioned and usually comprises the pH range 3 to 10.
  • Brass is a collective name for many alloys with copper and zinc as main components. Minor additions of most of the other frequently used alloy substances are common. When pure, copper and zinc are easily corroded. However, the alloys show better resistance and one may, as a thumb-rule, assume that if the chemical environment is such that it does not corrode aluminium, the same applies to brass details that may be present.
  • the inventor has studied the cleaning problem with a knowledge of cleaning processes and metal corrosion as starting point. He has found that the cleaning can be optimised by using a low to moderately alkaline cleaning agent.
  • the agent must have high buffering capacity and not contain silicates or other components that may form precipitates.
  • the agent should have a pH in use solution in the range 8.5 to 11, preferably 9 to10.5. The solution pH should not sink more than 1 pH unit during the cleaning operation.
  • Non-activated acidified hydrogen peroxide is a slow disinfection agent compared to, for instance, chlorine and activated hydrogen peroxide. Therefore the agent usually requires modification of earlier rinsing routines, which have not included disinfection, which has been done at the cleaning stage already, or comprised disinfection agents with much faster effect. If the process includes automatic operations, some reprogramming or other modifications may be necessary to ensure that the part of the rinsing done by acidified hydrogen peroxide is prolonged. Even a small prolongation (2 to 3 minutes) increases the effect appreciably, but the effect will increase still more if the prolongation is made longer for instance 10 to 20 minutes.
  • pH during the rinsing phase does not rise above 7, as the disinfection effect declines quickly with increasing pH.
  • the pH should be below 6 and still more preferred below 5.
  • the buffering capacity should be such that pH, during the whole rinsing phase with the acidified hydrogen peroxide containing solution, does not rise more than one pH unit, maximum, and under no circumstances above 7. Alkaline substances from the cleaning agent probably remain in clefts, etc. As the alkaline cleaning agent is buffered, the rinsing agent must have high buffering capacity.
  • the rinsing agent contains environmentally acceptable components only and does not leave behind remains that may influence food negatively from the taste or health points of view. This implies the very large advantage that no after-rinse is needed.
  • the small quantity of acid which may remain after that the rinse solution has been drained off, cannot influence the taste of the food.
  • the hydrogen peroxide decomposes into oxygen and water and leaves no remains. If skin contact occurs no burning pain is experienced even if the skin is already irritated.
  • Suitable acids for the acidification can be found among weak inorganic and weak organic acids. Strong acids are not suitable, as they, at the dilution to needed level for maintaining pH in the wanted range, lack acceptable buffer capacity. Further the acid should have acceptable quality from the food point of view. A very suitable acid for the purpose, especially in dairies, but also otherwise, is lactic acid.
  • This invention concerns a method for cleaning and disinfection of equipment containing construction details of aluminium and/or brass.
  • the process is begun by a washing with an alkaline washing solution with pH in the range 8.5 to 11, preferably 9 to 10.5 and ended with a rinsing with an acid hydrogen peroxide solution with pH in the range 2.5 to 6, preferably 3 to 5.
  • the acidified hydrogen peroxide solution of the invention is used with an alkaline washing agent.
  • an intermediate rinsing with water may be suitable.
  • silicates When aluminium is used as construction material, high pH must be avoided to prevent corrosion. Different silicate compounds are often used to protect aluminium against corrosion by alkaline solutions. However, silicates have a nasty tendency to precipitate at low pH and are therefore unfit for cleaning, where risk for contact between the cleaning solution and acid exists. This may be the case in narrow clefts, where an intermediate water rinse has not eliminated the silicates completely.
  • tripoly- or pyrophosphates are used as complexing agents instead.
  • Tripoly- and pyrophosphate contain, for reasons of equilibrium and production technique, small amounts of orthophosphate that react with aluminium to form water insoluble aluminium phosphate.
  • the corrosion protection is reinforced by further addition of orthophosphate.
  • the reaction between orthophosphate and aluminium makes the metal passive and reinforces the layer of aluminium oxide that serves as corrosion barrier and increases in this way the tolerance for high pH. Potassium salts are preferred due to their better solubility.
  • a large advantage of a phosphate based washing agent in combination with an acid rinsing agent is that no water insoluble precipitates can be formed from the contact between the washing agent and the rinsing agent.
  • Suitable surface active agents to be combined with potassium tripolyphosphate and/or potassium pyrophosphat are the so-called sugar tensides i.e. sugar surface active agents. Their effect may, with advantage, be reinforced with the aid of an easily biologically decomposed ampholyte surface active agent such as for instance AMPHOLAC ® YJH 40 or LAKELAND® 70, which are so-called betaines, i.e. ampholyte surface active agents where the anionic group is derived from a carboxylic acid. These surface active agents are considered unobjectionable from the environmental point of view. Agents with this composition become very low foaming even in presence of the fatty acid soaps formed by saponification of fats in the soil. This is a very important point for older machines, which are cleaned by intensive pump circulation of the wash solution.
  • composition may easily be changed in that direction by modification of the mixture of surface active agents such as, for instance, by adding laurylethersulphate and/or replacing the low foaming sugar surface active agent with a high foaming one.
  • the ampholyte surface active agent may also be, partly or totally, replaced by amine oxide and/or alkyl fatty acid diethanolamide.
  • the cleaning effect is improved if the dosing of the washing agent is divided into three parts, with one part for the pre-wash, one part for the main wash and a third part for the first rinsing.
  • Shock dilution of a wash solution containing soil may break emulsions and dispersions to let the soil fall back on the surfaces.
  • the precipitated soil will be extremely fine distributed. Such soil is very difficult to remove.
  • a small addition of surface active agents and complexing agents reduces the risk for breaking emulsions and dispersions and eliminates the danger of re-soiling.
  • a suitable distribution of the total amount of the washing agent may be 10 to 30% in the pre-wash, 40 to 80% in the main wash and 10 to 30% in the first rinse water.
  • Concentrate for dilution to use concentration is, with advantage, produced without water addition.
  • the rinsing agent may contain a suitable wetting agent.
  • a suitable wetting agent For applications in the food industry the wetting agent should be special. Suitable wetting agents can be found in the group of surface active agents that popularly are called sugar surface active agents, i.e. surface active agents where the hydrophilic group is derived from sugar.
  • An alternative to a wetting agent may be a suitable short-chained alcohol.
  • a foaming composition as acid rinsing agent may be preferable, too.
  • Such an agent can be easily achieved by a suitable choice of surface active agents.
  • a packing machine of the type TETRA BRIK® was used for the filling of 3 dl packages of cream. At the end of each packing day the machine was cleaned as follows:
  • composition which, at the delivery, contained: Ampholyte surface active agent 8% Sugar surface active agent 8% Potassium hydroxide (50% solution) 8% Polyacrylate (molecular weight 4500, 50% solution 4% Trisodiumorthophosphate 2% Potassiumtripolyphosphate (50% solution) 70% 10 litres of this concentrate were mixed with 15 litres water to 25 litres stock solution. Of this stock solution between 2 and 2.5 litres were added to 150 litres wash solution.
  • the result of the cleaning was checked by a standard method comprising measurement adenosintriphosphate (ATP) at some chosen critical points in the machine.
  • ATP adenosintriphosphate
  • example 1 The trials of example 1 were repeated on another machine with the change that the alkaline washing agent was dosed with 1 dl for pre-wash, 3 dl for main wash and 1 dl for the first rinsing.
  • the wash and rinse water quantities were 150 litres.
  • the wash process was the same.
  • a super concentrate i.e. a mixture without a water admixture (pH in the concentrate 12, in the use solution 9 to 10.5), was used.
  • the mixture's composition was: Ampholyte surface active agent 10% Sugar surface active agent 7,5% Potassiumtripolyphosphate(50% solution) 67% Potassium hydroxide(50% solution) 8% Polyacrylate 4% Trisodiumphosphate 2% Laurylethersulphate 1,5% I.e. very similar to the composition of example 1.
  • an acid rinse agent For the final rinsing one litre of an acid rinse agent was added. This agent had pH in concentrate 2.5 and pH in use solution 2.5 to 2.8 and the composition: Ethanol/isopropanol 9% Lactic acid 80% Sugar surface active agent 1% Acetic acid 10%
  • Second rinsing 1 litre rinsing agent to 150 litres of water, 4 minutes.
  • the concentrate of the rinsing agent was prepared by the mixing of a hydrogen peroxide solution, containing 30 to 35% by weight hydrogen peroxide, with 2% by weight of a lactic acid mixture, containing 60% by weight acid.

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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)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
EP98930039A 1997-06-27 1998-06-26 Cleaning in the food industry Expired - Lifetime EP1027420B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9702502A SE512839C2 (sv) 1997-06-27 1997-06-27 Förfarande för rengöring av förpackningsmaskiner och hanteringsutrustning för livsmedel med mera, som innehåller konstruktionsdetaljer av aluminium och/eller mässing och sköljmedel för användning vid förfarandet
SE9702502 1997-06-27
PCT/SE1998/001274 WO1999000474A1 (en) 1997-06-27 1998-06-26 Cleaning in the food industry

Publications (2)

Publication Number Publication Date
EP1027420A1 EP1027420A1 (en) 2000-08-16
EP1027420B1 true EP1027420B1 (en) 2004-05-06

Family

ID=20407571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98930039A Expired - Lifetime EP1027420B1 (en) 1997-06-27 1998-06-26 Cleaning in the food industry

Country Status (10)

Country Link
EP (1) EP1027420B1 (xx)
AU (1) AU7952098A (xx)
BR (1) BR9810466A (xx)
DE (1) DE69823689D1 (xx)
DK (1) DK1027420T3 (xx)
EE (1) EE03932B1 (xx)
NO (1) NO319928B1 (xx)
PL (1) PL337669A1 (xx)
SE (1) SE512839C2 (xx)
WO (1) WO1999000474A1 (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8262805B2 (en) 2010-08-23 2012-09-11 Ecolab Usa Inc. Poly sulfonate functionalized alkyl polyglucosides for enhanced food soil removal
US8283302B2 (en) 2010-06-21 2012-10-09 Ecolab Usa Inc. Alkyl polypentosides and alkyl polyglucosides (C8-C11) used for enhanced food soil removal
US8287659B2 (en) 2010-08-23 2012-10-16 Ecolab Usa Inc. Poly phosphate functionalized alkyl polyglucosides for enhanced food soil removal
US8299009B2 (en) 2010-06-21 2012-10-30 Ecolab Usa Inc. Betaine functionalized alkyl polyglucosides for enhanced food soil removal
US8329633B2 (en) 2010-09-22 2012-12-11 Ecolab Usa Inc. Poly quaternary functionalized alkyl polyglucosides for enhanced food soil removal
US8389457B2 (en) 2010-09-22 2013-03-05 Ecolab Usa Inc. Quaternary functionalized alkyl polyglucosides for enhanced food soil removal
US8460477B2 (en) 2010-08-23 2013-06-11 Ecolab Usa Inc. Ethoxylated alcohol and monoethoxylated quaternary amines for enhanced food soil removal
US8658584B2 (en) 2010-06-21 2014-02-25 Ecolab Usa Inc. Sulfosuccinate functionalized alkyl polyglucosides for enhanced food and oily soil removal
US8877703B2 (en) 2010-09-22 2014-11-04 Ecolab Usa Inc. Stearyl and lauryl dimoniumhydroxy alkyl polyglucosides for enhanced food soil removal
US11834624B2 (en) 2014-03-07 2023-12-05 Ecolab Usa Inc. Alkyl amides for enhanced food soil removal and asphalt dissolution

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10127919A1 (de) * 2001-06-08 2002-12-19 Ecolab Gmbh & Co Ohg Reinigungsverfahren zur Stärkeentfernung
US8092613B2 (en) 2002-05-31 2012-01-10 Ecolab Usa Inc. Methods and compositions for the removal of starch
EP1477552A1 (en) * 2003-05-13 2004-11-17 Ecolab Inc. Method for cleaning articles in a dish washing machine
US9102604B1 (en) * 2010-02-15 2015-08-11 Baxter International Inc. Methods for cleaning distilling columns
AU2012260576B2 (en) 2011-05-20 2015-07-09 Ecolab Usa Inc. Acid formulations for use in a system for warewashing
US9089251B2 (en) 2011-10-14 2015-07-28 Ecolab Usa Inc. Method of removing and preventing redeposition of protein soils using sugar esters
ES2750872T3 (es) 2011-12-13 2020-03-27 Ecolab Usa Inc Método de lavado de vajilla
US11659838B2 (en) 2021-04-01 2023-05-30 Sterilex, Llc Quat-free powdered disinfectant/sanitizer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5567444A (en) * 1993-08-30 1996-10-22 Ecolab Inc. Potentiated aqueous ozone cleaning and sanitizing composition for removal of a contaminating soil from a surface
GB9513110D0 (en) * 1995-06-28 1995-08-30 Laporte Esd Ltd Dairy system cleaning preparation and method
DE19600475A1 (de) * 1996-01-09 1997-07-10 Henkel Ecolab Gmbh & Co Ohg Verfahren zum Reinigen und Desinfizieren von Melkanlagen

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8299009B2 (en) 2010-06-21 2012-10-30 Ecolab Usa Inc. Betaine functionalized alkyl polyglucosides for enhanced food soil removal
US8283302B2 (en) 2010-06-21 2012-10-09 Ecolab Usa Inc. Alkyl polypentosides and alkyl polyglucosides (C8-C11) used for enhanced food soil removal
US8658584B2 (en) 2010-06-21 2014-02-25 Ecolab Usa Inc. Sulfosuccinate functionalized alkyl polyglucosides for enhanced food and oily soil removal
US8460477B2 (en) 2010-08-23 2013-06-11 Ecolab Usa Inc. Ethoxylated alcohol and monoethoxylated quaternary amines for enhanced food soil removal
US8262805B2 (en) 2010-08-23 2012-09-11 Ecolab Usa Inc. Poly sulfonate functionalized alkyl polyglucosides for enhanced food soil removal
US8287659B2 (en) 2010-08-23 2012-10-16 Ecolab Usa Inc. Poly phosphate functionalized alkyl polyglucosides for enhanced food soil removal
US8329633B2 (en) 2010-09-22 2012-12-11 Ecolab Usa Inc. Poly quaternary functionalized alkyl polyglucosides for enhanced food soil removal
US8389457B2 (en) 2010-09-22 2013-03-05 Ecolab Usa Inc. Quaternary functionalized alkyl polyglucosides for enhanced food soil removal
US8557760B2 (en) 2010-09-22 2013-10-15 Ecolab Usa Inc. Quaternary functionalized alkyl polyglucosides for enhanced food soil removal
US8877703B2 (en) 2010-09-22 2014-11-04 Ecolab Usa Inc. Stearyl and lauryl dimoniumhydroxy alkyl polyglucosides for enhanced food soil removal
US10035975B2 (en) 2010-09-22 2018-07-31 Ecolab Usa Inc. Stearyl and lauryl dimoniumhydroxy alkyl polyglucosides for enhanced food soil removal
US10655085B2 (en) 2010-09-22 2020-05-19 Ecolab Usa Inc. Stearyl and lauryl dimoniumhydroxy alkyl polyglucosides for enhanced food soil removal
US11834624B2 (en) 2014-03-07 2023-12-05 Ecolab Usa Inc. Alkyl amides for enhanced food soil removal and asphalt dissolution

Also Published As

Publication number Publication date
EE03932B1 (et) 2002-12-16
EE9900608A (et) 2000-08-15
PL337669A1 (en) 2000-08-28
AU7952098A (en) 1999-01-19
DE69823689D1 (de) 2004-06-09
BR9810466A (pt) 2000-09-05
EP1027420A1 (en) 2000-08-16
NO996485L (no) 2000-02-02
NO319928B1 (no) 2005-10-03
NO996485D0 (no) 1999-12-27
SE9702502L (sv) 1998-12-28
DK1027420T3 (da) 2004-08-30
SE9702502D0 (sv) 1997-06-27
WO1999000474A1 (en) 1999-01-07
SE512839C2 (sv) 2000-05-22

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