EP0883676A2 - Nettoyant pour installations de l'industrie alimentaire, son utilisation et procede de nettoyage de ces installations - Google Patents

Nettoyant pour installations de l'industrie alimentaire, son utilisation et procede de nettoyage de ces installations

Info

Publication number
EP0883676A2
EP0883676A2 EP97903331A EP97903331A EP0883676A2 EP 0883676 A2 EP0883676 A2 EP 0883676A2 EP 97903331 A EP97903331 A EP 97903331A EP 97903331 A EP97903331 A EP 97903331A EP 0883676 A2 EP0883676 A2 EP 0883676A2
Authority
EP
European Patent Office
Prior art keywords
cleaning
hydroxide solution
cleaning agent
potassium hydroxide
hydroxide
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.)
Granted
Application number
EP97903331A
Other languages
German (de)
English (en)
Other versions
EP0883676B1 (fr
Inventor
Anja Patten
Ralf Krack
Dietmar Rossner
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 GmbH and Co oHG
Original Assignee
Henkel Ecolab GmbH and Co KG
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
Application filed by Henkel Ecolab GmbH and Co KG filed Critical Henkel Ecolab GmbH and Co KG
Publication of EP0883676A2 publication Critical patent/EP0883676A2/fr
Application granted granted Critical
Publication of EP0883676B1 publication Critical patent/EP0883676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/0047—Detergents in the form of bars or tablets
    • C11D17/0056—Lavatory cleansing blocks
    • 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
    • C11D3/2086—Hydroxy 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
    • 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
    • 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
    • C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines

Definitions

  • the invention relates to an aqueous alkaline cleaning agent for plants in the food industry, containing potassium hydroxide solution.
  • the invention also relates to a method for cleaning plants in the food industry using an alkaline cleaning liquor which is regenerated by means of membrane filtration, the permeate being recycled.
  • alkaline cleaning solutions For cleaning plants in the food processing industry, e.g. B. tanks, pipes, filling systems and the like, it is known to use alkaline cleaning solutions. These cleaning liquors consist essentially of a 2% sodium hydroxide solution with the addition of cleaning boosters, e.g. B. defoamers and emulsifiers.
  • cleaning boosters e.g. B. defoamers and emulsifiers.
  • potassium hydroxide solution instead of sodium hydroxide solution, since this produces an equivalent cleaning result.
  • sodium hydroxide solution is used for reasons of cost. Potassium hydroxide is added to the sodium hydroxide solution to a small extent only in the case of low outside temperatures in order to lower the crystallization point of the cleaning agent concentrate.
  • the proportion of potassium hydroxide in the total hydroxide components is definitely well below 20% by weight.
  • the alkaline cleaning solutions often contain an addition of ethylenediaminetetraacetic acid (EDTA) in the form of its disodium salt, since EDTA is the only complexing agent in aqueous, alkaline cleaning solutions that contains mineral contaminants such as calcium and magnesium salts, e.g. water hardness deposits, milk stone, beer stone and others. can dissolve.
  • EDTA ethylenediaminetetraacetic acid
  • the permeate which consists of water and sodium hydroxide solution, is returned to the collecting container for the cleaning solution.
  • the organic contaminants which are removed from time to time, accumulate in the buffer tank of the membrane cleaning system in order to dispose of them. Since the use of EDTA-containing cleaning solutions prevents EDTA from entering the wastewater due to the lack of biodegradability of the compound and its property of remobilizing heavy metals in the environment, the Israeli patent application IS 109 249 suggests EDTA by acid precipitation from the concentrates that collect in the buffer tank. By adding EDTA in the cleaning liquors, however, the performance of the nanofiltration system is reduced, which is noticeable in a significantly reduced flow.
  • the invention has for its object to provide an alkaline cleaning agent and a method for cleaning systems of the food industry of the type mentioned, which enables considerably more economical cleaning than in the prior art.
  • the cleaning agent contains only potassium hydroxide or a mixture of potassium hydroxide and another alkali, in particular sodium hydroxide solution, with at least 20% by weight of potassium hydroxide, calculated as hydroxide and based on the hydroxide component the total amount of hydroxide contained in the detergent.
  • the above-mentioned object is achieved by using a cleaning solution whose hydroxide component consists exclusively of potassium hydroxide solution or of a mixture of potassium hydroxide solution and another alkali, in particular sodium hydroxide solution, with at least 20% by weight of potassium hydroxide solution , calculated as hydroxide and based on the total amount of hydroxide contained in the cleaning solution.
  • the inventors have found that a partial or complete replacement of sodium hydroxide with potassium hydroxide increases the performance of the membrane system by at least 10 to 50%.
  • the performance here relates to the permeate flows achieved.
  • the system investment and the energy consumption of the membrane filtration system can be reduced.
  • Higher concentrations of the separated dirt load are possible, so that the amount of the dirt load is reduced and the yield of regenerated lye is increased.
  • the cleaning agent according to the invention or the implementation of the invention leads to problems Process a mass containing the impurities liquid at room temperature and even at a temperature of 0 ° C.
  • waste logistics are facilitated, and on the other hand, a higher concentration and thus a higher nutrient content in the case of animal feed recycling and a higher energy content in the case of thermal recycling can be achieved.
  • the performance of the membrane filtration system is also increased by replacing the sodium salts with potassium salts. Disadvantages that occur in the filtration through the use of EDTA can be compensated for or simply by simply using potassium hydroxide solution and EDTA in the form of the free acid or its potassium salt be overcompensated. Use of the EDTA disodium salt is also possible if the sodium ion content of the agent does not exceed certain limits. If all alkali metal ions are calculated as alkali hydroxide, the potassium hydroxide content of the detergent, based on the total amount of hydroxide in the detergent, must not drop below 20% by weight. In general, the performance of the filtration system increases with the ratio of potassium to sodium ions in the cleaning agent, which means that sodium-free cleaning solutions give the highest flow rates in l / m 2 h.
  • the cleaning agent preferably contains a mixture of potassium hydroxide solution and another alkali, preferably sodium hydroxide solution, with at least 50% by weight of potassium hydroxide solution, calculated and referred to as mentioned above.
  • EDTA-free cleaning agents with at least 50% by weight of potassium hydroxide solution is the possibility of filtering off the contaminations immediately as animal feed without further treatment, e.g. B. as pig feed, because an increased salt content in the case of potassium salts can be tolerated rather than an increased sodium salt content.
  • the EDTA fr eie detergent as the hydroxide component .ausset contains potassium hydroxide solution.
  • the concentrate which is contained in a thick case in membrane filtration, is a valuable additive for animal feed, especially for pig feed, due to its high proportion of potassium ions.
  • the cleaning agent contains additives, all of which are suitable as additives for animal feed.
  • additives all of which are suitable as additives for animal feed.
  • phosphates, gluconates and / or defoamers and emulsifiers approved under food law are proposed as such special, physiologically harmless cleaning enhancers that are not used in the known cleaning agents.
  • the cleaning agent contains, in addition to the hydroxide constituents, additives which are in the form of potassium salts.
  • the performance of the membrane filtration system can be additionally increased in this case. If the permeate flow in a conventional sodium hydroxide based detergent such. B. is 50 l / m 2 h, this performance is the replacement of the sodium hydroxide solution with potassium hydroxide solution was increased to 70 l / rr) for 2 hours. If the cleaning agent also contains potassium tripolyphosphate as a cleaning booster, the permeate flow additionally increases to 74 l / m 2 h.
  • Another advantage of these additives in the form of potassium salts is their particularly good suitability as animal feed additives.
  • the cleaning agent according to the invention can advantageously be used for systems in the food industry which are equipped with a regeneration system for used cleaning liquors.
  • the use of the cleaning agent in dairy farming systems is particularly preferred, since the concentrate obtained can be used as animal feed without further aftertreatment. Diafiltration or other additional work-up is usually not necessary. Not only is there no elaborate disposal of the separated impurities, but these "impurities" represent a new valuable substance. However, if the increased salt content is reduced by means of diafiltration, this can be worked up in the case of the cleaning agent or cleaning agent according to the invention implementation process much faster and therefore more economically.
  • the EDTA can be recovered from the concentrates obtained in the nanofiltration of EDTA-containing cleaning liquors by stepwise acidification. If the concentrate is acidified unspecifically (as described in the Israeli application IS 109 249), in addition to EDTA, almost all of the dirt contained in the concentrate precipitates. When the precipitated and filtered EDTA is redissolved with a lye, the dirt is also loosened again. If this solution is added to the lye cleaned by means of nanofiltration, the degree of contamination before the nanofiltration is reached again. By gradual acidification (fractional precipitation), the bulk of the dirt can be precipitated for the EDTA precipitation point. This precipitated dirt can then be removed by simple filtration.
  • EDTA will precipitate with a much lower level of residual contamination.
  • the filtered EDTA can be converted back into a soluble form with alkali and added to the permeate from the nanofiltration, for example. Since certain portions of EDTA remain both in the precipitated sludge and in the solution from which it was precipitated, this method can be used to recycle 80-90% of the EDTA originally used. Due to its residual EDTA content, the filtered dirt can no longer be used as animal feed.
  • alkali-resistant nanofiltration membranes with a D value of 100 to 2000 daltons are preferably used to regenerate the cleaning liquor.
  • Such membranes are permeable to molecules with a molecular weight up to the stated D value, but retain molecules with higher molecular weights.
  • membrane filtration is operated in cross flow with a transmembrane pressure difference of 8 to 25 bar.
  • a cleaning liquor is used for cleaning plants in the dairy industry which, in addition to the hydroxide constituents, contains only additives which are suitable as additives for animal feed and that the concentrate obtained in membrane filtration is used as Animal feed or additive to animal feed is used.
  • a concentrate with a particularly high potassium content is much better than concentrates with a high sodium content for use as animal feed, e.g. B. suitable as pig feed. Therefore, it is also proposed that the hydroxide components of the cleaning solution consist exclusively of potassium hydroxide.
  • the liquor which contains about 2% by weight of sodium hydroxide solution in the prior art and 2% by weight of potassium hydroxide solution according to the invention, is heated to 60 to 70 ° C. ⁇ is perforated, supplied to the systems to be cleaned, tanks, pipelines, etc., which are designated by the reference number 2 in FIG.
  • the cleaning liquor is circulated.
  • the contamination of the cleaning liquor that accumulates over time is removed with the treatment part shown on the right in FIG. 1.
  • part of the cleaning liquor is discharged into the buffer tank 4 via a line 3.
  • This portion of the cleaning liquor is circulated through a pressure pump 5 and a membrane module 6.
  • the contaminants that accumulate and settle in the buffer tank 4 are removed from time to time via a line 7.
  • the permeate emerging from the membrane module is returned to the collecting tank 1 via the return line 8.
  • the permeate flow was 50 l / hm 2 .
  • the permeate flow was 50 l / hm 2 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Detergent Compositions (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Dairy Products (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

Le nettoyant alcalin aqueux décrit contient, comme constituant hydroxyde, uniquement de l'hydroxyde de potassium ou un mélange d'hydroxyde de potassium et d'un autre alcali, la teneur en hydroxyde de potassium étant d'au moins 20 % en poids, exprimée sous forme d'hydroxyde, par rapport à la quantité totale d'hydroxyde présente dans le nettoyant. Ce dernier permet un nettoyage beaucoup plus économique que les nettoyants de la technique antérieure. Le procédé selon l'invention comprend la régénération du nettoyant par filtration sur membrane.
EP97903331A 1996-03-01 1997-02-20 Nettoyant pour installations de l'industrie alimentaire, son utilisation et procede de nettoyage de ces installations Expired - Lifetime EP0883676B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19607800 1996-03-01
DE19607800A DE19607800A1 (de) 1996-03-01 1996-03-01 Reinigungsmittel für Anlagen der Lebensmittelindustrie, seine Verwendung und Verfahren zum Reinigen dieser Anlagen
PCT/EP1997/000799 WO1997032000A2 (fr) 1996-03-01 1997-02-20 Nettoyant pour installations de l'industrie alimentaire, son utilisation et procede de nettoyage de ces installations

Publications (2)

Publication Number Publication Date
EP0883676A2 true EP0883676A2 (fr) 1998-12-16
EP0883676B1 EP0883676B1 (fr) 2001-04-25

Family

ID=7786862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97903331A Expired - Lifetime EP0883676B1 (fr) 1996-03-01 1997-02-20 Nettoyant pour installations de l'industrie alimentaire, son utilisation et procede de nettoyage de ces installations

Country Status (14)

Country Link
US (1) US6204231B1 (fr)
EP (1) EP0883676B1 (fr)
JP (1) JP2000506910A (fr)
AT (1) ATE200792T1 (fr)
AU (1) AU714812B2 (fr)
BR (1) BR9707898A (fr)
CA (1) CA2248080A1 (fr)
DE (2) DE19607800A1 (fr)
DK (1) DK0883676T3 (fr)
ES (1) ES2156360T3 (fr)
GR (1) GR3035881T3 (fr)
NO (1) NO983115L (fr)
NZ (1) NZ331625A (fr)
WO (1) WO1997032000A2 (fr)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
DE19726287A1 (de) * 1997-06-20 1998-12-24 Henkel Ecolab Gmbh & Co Ohg Verfahren zum Waschen von Wäsche, insbesondere von Berufsbekleidung
US7909179B2 (en) * 2005-08-16 2011-03-22 Ge Osmonics, Inc. Modified polyamide matrices and methods for their preparation
US7575687B2 (en) * 2005-08-16 2009-08-18 Ge Osmonics, Inc. Membranes and methods useful for caustic applications
US20100151094A1 (en) * 2008-12-16 2010-06-17 Choudhury Gour S Methods, apparatuses, and systems for the removal of peels from agricultural produce
CN104662141B (zh) * 2012-06-07 2018-06-29 戴弗西公司 流出物中性的用于清洁、杀菌和消毒的组合物和方法
US8835140B2 (en) 2012-06-21 2014-09-16 Ecolab Usa Inc. Methods using peracids for controlling corn ethanol fermentation process infection and yield loss
SI3156475T1 (sl) 2015-10-16 2018-10-30 Hans Georg Hagleitner Tekoči koncentrat za čiščenje
US20230313071A1 (en) * 2015-10-16 2023-10-05 Hans Georg Hagleitner Liquid detergent concentrate
GB201801230D0 (en) * 2018-01-25 2018-03-14 Univ Leuven Kath Cross-linked nanofiltration membranes

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US4243543A (en) * 1979-05-11 1981-01-06 Economics Laboratory, Inc. Stabilized liquid enzyme-containing detergent compositions
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Also Published As

Publication number Publication date
WO1997032000A3 (fr) 1997-12-11
CA2248080A1 (fr) 1997-09-04
NZ331625A (en) 1999-11-29
ATE200792T1 (de) 2001-05-15
GR3035881T3 (en) 2001-08-31
BR9707898A (pt) 1999-07-27
DE19607800A1 (de) 1997-09-04
NO983115L (no) 1998-07-06
DE59703437D1 (de) 2001-05-31
DK0883676T3 (da) 2001-08-13
AU714812B2 (en) 2000-01-13
JP2000506910A (ja) 2000-06-06
US6204231B1 (en) 2001-03-20
EP0883676B1 (fr) 2001-04-25
AU1792997A (en) 1997-09-16
ES2156360T3 (es) 2001-06-16
WO1997032000A2 (fr) 1997-09-04

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