JP2022184806A - Alkaline detergent composition for CIP and CIP cleaning method - Google Patents

Abstract

To provide an alkaline detergent composition for CIP that maintains good detergency and is excellent in preventing metal corrosion even when alkali cleaning in CIP cleaning is performed at ultra-high temperatures, and a CIP cleaning method.SOLUTION: An alkaline detergent composition for CIP is characterized by containing alkali metal hydroxide as component (A), at least one selected from methylglycine diacetic acid and/or a salt thereof and glutamic acid diacetic acid and/or a salt thereof as component (B), an olefin-maleic acid copolymer or a salt thereof as component (C), and water as component (D).SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to an alkaline detergent composition for CIP suitable for cleaning and removing stains adhered to manufacturing equipment in food factories, beverage factories, etc., and a CIP cleaning method using the same.

2. Description of the Related Art In recent years, in beverage factories, food factories, etc., it has become difficult to dismantle and clean manufacturing equipment due to the increase in the size of manufacturing equipment and the increase in the frequency of cleaning due to the increase in the number of manufactured products. Therefore, instead of disassembly cleaning, CIP cleaning (CIP cleaning) that cleans and removes residual dirt by filling and circulating the cleaning liquid in the manufacturing equipment such as pipes, sterilizers and filling machines, or by spraying the cleaning liquid on the manufacturing equipment. Cleaning in place (cleaning in place) method is widely adopted.

This CIP cleaning uses one or more cleaning agents selected from alkali cleaning agents, acid cleaning agents, disinfectants, and the like. For example, CIP cleaning generally consists of: 1. water wash;2. 3. alkaline cleaning; water rinse;4. 5. acid wash; water rinse;6. 7. sterilization; It is done in a process called water rinsing. Further, depending on the composition of each cleaning agent or the type and condition of stains, some of the above steps may be omitted, the order of the steps may be changed, or the same steps may be repeated.

Alkaline cleaning agents used for alkaline cleaning in such CIP cleaning are known from Patent Documents 1 to 4 and the like. Specifically, in Patent Document 1, alkali metal hydroxides, fatty acids having 6 to 10 carbon atoms in the hydrocarbon group and / or salts thereof, chelating agents, nonionic surfactants, polyacrylic acid, etc. A liquid alkaline detergent composition containing a molecular dispersant is disclosed in U.S. Pat. An alkaline detergent composition containing a chelating agent is disclosed, and Patent Document 3 discloses sodium hydroxide, ethylenediaminetetraacetic acid and/or salts thereof, triethylenetetraaminehexaacetic acid, glycol etherdiaminetetraacetic acid, ethylenediamine. Disclosed are liquid hard surface cleaning compositions containing at least one solubilizer selected from disuccinic acid and salts thereof. Furthermore, in Patent Document 4, a diluted cleaning solution obtained by diluting a CIP cleaning composition containing an alkali metal hydroxide and/or an alkaline earth metal hydroxide and methylglycine diacetic acid or a salt thereof with water , describes a CIP cleaning method in which CIP cleaning and sterilization cleaning of a food production line are performed simultaneously by adding a chlorine-based sanitizing agent.

JP 2019-059851 A JP 2017-210522 A JP 2012-087161 A JP 2017-002250 A

By the way, in the final process of manufacturing products such as food and beverages, the product sterilization process for sterilizing the product is generally performed at an ultra-high temperature (temperature of 110° C. or higher). On the other hand, the alkali cleaning process and acid cleaning process in CIP cleaning are generally performed at a temperature of 100° C. or less. This is because if the cleaning process is carried out at an ultra-high temperature using a cleaning agent containing chemicals, corrosion (hereinafter simply referred to as metal corrosion) may occur in the metal parts provided in the manufacturing equipment, etc., which are the objects to be cleaned. be. Therefore, when switching from product manufacturing to CIP cleaning, the temperature inside the manufacturing equipment, which is the object to be cleaned, must be lowered, and this cooling requires time and cost, which is a problem.

According to the studies of the present inventors, the pickling process can suppress the occurrence of metal corrosion even at extremely high temperatures by selecting phosphoric acid or the like as an acid component contained in the pickling agent used in the pickling process. It turns out there is. However, in the alkaline cleaning process, when conventional alkaline cleaning compositions represented by the CIP alkaline cleaning compositions disclosed in Patent Documents 1 to 4 described above are used in an ultra-high temperature environment, metal corrosion is prevented. was difficult to do.

Therefore, it has been desired to provide an alkaline detergent composition for CIP that does not induce metal corrosion even when used at extremely high temperatures. There is also a demand for a CIP cleaning method that can omit the cooling process when switching from product manufacturing to CIP cleaning while suppressing metal corrosion caused by alkali cleaning, thereby shortening the time and cost of CIP cleaning. had been

The present invention has been made in view of the above problems. That is, the present invention provides an alkaline detergent composition for CIP and a CIP cleaning method that are excellent in metal corrosion prevention while maintaining good detergency even when alkali cleaning in CIP cleaning is performed at an ultra-high temperature. for the purpose.

In order to solve the above-mentioned problems, the inventors of the present invention conducted extensive studies and found that the above-mentioned problems were solved by adding a specific chelating agent and an olefin-maleic acid copolymer to an alkaline cleaning agent. We have found that we can obtain it, and have completed the present invention.

That is, in the alkaline detergent composition for CIP of the present invention, the (A) component is an alkali metal hydroxide, and the (B) component is selected from methylglycine diacetic acid and/or its salts, glutamic acid diacetic acid and/or its salts. olefin-maleic acid copolymer or its salt as component (C), and water as component (D).

In the CIP cleaning method of the present invention, a cleaning liquid obtained by diluting the CIP alkaline cleaning composition of the present invention with water or hot water so that the component (C) is 0.001% by mass or more and 1% by mass or less. is heated to 110° C. or higher and used in the alkali cleaning step.

The alkaline detergent composition for CIP of the present invention, which has such a constitution, prevents corrosion of the metal inside the device, which is the object to be cleaned, while maintaining good detergency even when used at an extremely high temperature. It is possible.
In addition, the CIP cleaning method of the present invention exhibits good cleaning performance even when alkali cleaning is performed at an ultra-high temperature, and can satisfactorily prevent the occurrence of metal corrosion due to the alkali cleaning. . Therefore, according to the CIP cleaning of the present invention, it is possible to shorten the time and reduce the cost.

The alkaline detergent composition for CIP and the CIP cleaning method of the present invention will be described below in order.
In the description of the present invention, the term "ultra-high temperature" refers to a temperature of 110° C. or higher unless otherwise specified.

In the alkaline detergent composition for CIP of the present invention, the (A) component is an alkali metal hydroxide, and the (B) component is selected from methylglycine diacetic acid and/or its salts, glutamic acid diacetic acid and/or its salts. It contains at least one component (C), an olefin-maleic acid copolymer or a salt thereof, and water as a (D) component.
The alkaline detergent composition for CIP of the present invention having such a constitution can prevent metal corrosion of the object to be cleaned, such as manufacturing equipment, while maintaining good detergency even when used at an ultrahigh temperature. .

The alkali metal hydroxide of component (A) may be any alkali metal hydroxide that can be used as an alkali detergent for CIP cleaning, and examples thereof include sodium hydroxide and potassium hydroxide. These may be used alone or in combination of two or more.

In 100% by mass of the alkaline detergent composition for CIP of the present invention, the content of the alkali metal hydroxide as component (A) is preferably 10% by mass or more and 40% by mass or less, and is preferably 20% by mass or more and 38% by mass. % or less, more preferably 26 mass % or more and 35 mass % or less.
If the content of component (A) is less than 10% by mass, detergency may deteriorate, and if it exceeds 40% by mass, metal corrosion prevention and storage stability may not be sufficient.

The component (B) includes at least one selected from methylglycine diacetic acid and/or its salts and glutamic acid diacetic acid and/or its salts. The component (B) in the present invention is one type of compound called a so-called chelating agent, and exerts an effect of preventing scale from adhering to equipment in CIP cleaning. However, in the present invention, the effect of the component (B) is not limited to this, and among the many chelating agents, the combination of the component (B) and the component (C) described below provides good storage stability. Also, it is possible to provide an alkaline detergent composition for CIP, which can satisfactorily prevent metal corrosion even when used at extremely high temperatures.

Among them, it is preferable that methylglycine diacetic acid and/or a salt thereof is contained as the component (B), from the viewpoint of particularly excellent metal corrosion prevention properties.

In 100% by mass of the alkaline detergent composition for CIP of the present invention, the content of component (B) is preferably 0.1% by mass or more and 10% by mass or less, and is preferably 0.3% by mass or more and 8% by mass. % or less, more preferably 0.5 mass % or more and 4 mass % or less.
If the content of component (B) is less than 0.1% by mass, adhesion of scales in the facility may become noticeable, and if it exceeds 10% by mass, metal corrosion prevention and storage stability are insufficient. may disappear.

Component (C) includes an olefin-maleic acid copolymer or a salt thereof.
Examples of the olefin-maleic acid copolymer or salt thereof include commercially available products such as Sokalan CP9 (manufactured by BASF), Acusol 460N (manufactured by Dow Chemical), and Diacalna 30M (manufactured by Mitsubishi Chemical Corporation).
As described above, the component (C) is used in combination with the component (B) to improve the storage stability of the alkaline detergent composition for CIP and even when used at an ultra-high temperature. It is possible to prevent metal corrosion.

Among them, from the viewpoint of being able to provide an alkaline detergent composition for CIP with a higher metal corrosion inhibitory effect, the weight-average molecular weight of the olefin-maleic acid copolymer or its salt as the component (C) is It is preferably 1,000 or more and 200,000 or less, more preferably 3,000 or more and 100,000 or less, and even more preferably 8,000 or more and 50,000 or less.
If the weight average molecular weight of the olefin-maleic acid copolymer or its salt is less than 1000, the effect of preventing metal corrosion may not be sufficiently exhibited when used at ultra-high temperatures, and it exceeds 200000. In some cases, storage stability may decrease.
The weight average molecular weight of component (C) is a value determined by a gel permeation chromatography (GPC) method. The equipment and conditions used for the GPC method are as follows.
Columns used: TSKgel G4000Hxl, G3000Hxl, and G2000Hxl (all manufactured by Tosoh Corporation) connected in series are used.
Free liquid: THF (tetrahydrofuran), flow rate: 1 mL/min, detector: RI, sample concentration: 0.1% by mass (THF solution), sample volume: 200 µL, column temperature: 40°C

In 100% by mass of the alkaline detergent composition for CIP of the present invention, the content of component (C) is preferably 0.01% by mass or more and 2% by mass or less. It is more preferably contained in an amount of 5% by mass or less, more preferably 0.1% by mass or more and 1% by mass or less.
If the content of component (C) is less than 0.01% by mass, the effect of preventing metal corrosion may not be sufficiently exhibited when used at ultrahigh temperatures, and if it exceeds 2% by mass, storage stability is poor. may decrease.

The water of component (D) is not particularly limited, and includes tap water, industrial water, reclaimed water, ion-exchanged water, RO water, distilled water, soft water, and the like.
These may be used alone or in combination of two or more, but tap water is preferred from the viewpoint of economy. As tap water, for example, tap water from Arakawa Ward, Tokyo (pH = 7.6, total alkalinity (calculated as calcium carbonate) 40.5 mg/L, German hardness 2.3° DH (of which, calcium hardness is 1.5 mg/L). 7° DH, magnesium hardness 0.6° DH), chloride ion 21.9 mg/L, sodium and its compounds 15 mg/L, nitrate nitrogen and nitrite nitrogen 1.2 mg/L, fluorine and its compounds 0.2 mg/L. 1 mg/L, boron and its compounds 0.04 mg/L, total trihalomethane 0.016 mg/L, residual chlorine 0.4 mg/L, organic matter (total organic carbon content) 0.7 mg/L). Water is blended so that the total amount of the alkaline cleaning composition for CIP is 100% by mass.

The above-mentioned alkaline detergent composition for CIP may contain other components commonly used in the technical field, if necessary, as long as the effects of the present invention are not impaired. Such components include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, scale inhibitors, oxidizing agents, thickeners, pH adjusters, deodorants, enzymes, pigments, Perfume etc. are mentioned. In order to further ensure the effect of the present invention, a metal corrosion inhibitor may be added.

Nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene dialkyl ethers, polyoxyalkylene alkyl esters, polyoxyalkylene alkyl diesters, polyoxyalkylene alkyl aryl ethers, glycerin fatty acid esters or their ethylene oxide adducts, polyglycerin. Fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene glycol fatty acid ester, polyoxyethylene polyoxypropylene alkyl ether or its ethylene oxide and/or propylene oxide adduct, poly One or more selected from oxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkylamine, higher fatty acid alkanolamide, alkyl glycoside including alkyl polyglucoside, alkyl amine oxide and the like. Pluronic surfactants such as polyoxyethylene alkenyl ethers and polyoxyethylene polyoxypropylene polymers (ethylene oxide and propylene oxide may be random, block or reverse) may also be used.
In the above description, the addition form of the ethylene oxide and/or propylene oxide adduct may be either random or block.
Among them, from the viewpoint of exhibiting excellent foam suppressing properties even when stains containing proteins are washed, nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, and their ethylene oxides and/or or adducts of propylene oxide are preferred. Specific commercially available products include Adeka Pluronic series, Adekatol LB series, Adekanol B series manufactured by ADEKA, and Pullurafax LF series manufactured by BASF.
In 100% by mass of the alkaline detergent composition for CIP of the present invention, the nonionic surfactant described above is preferably contained in an amount of 0.1% by mass or more and 5% by mass or less, and 0.3% by mass or more and 3% by mass. % or less, more preferably 0.5 mass % or more and 1.5 mass % or less. If it is less than 0.1% by mass, the antifoaming property may not be improved, and if it exceeds 5% by mass, the long-term storage stability may be deteriorated or foaming may occur.

Examples of anionic surfactants include higher alcohol sulfate salts, sulfurized olefin salts, higher alkylsulfonates, α-olefin sulfonates, sulfated fatty acid salts, sulfonated fatty acid salts, phosphate ester salts, and fatty acid ester sulfates. Salts, glyceride sulfates, sulfonates of fatty acid esters, α-sulfo fatty acid methyl esters, polyoxyalkylene alkyl ether sulfates, polyoxyalkylene alkylphenyl ether sulfates, fatty acid alkanolamides or alkylene oxide adducts thereof sulfate, sulfosuccinate, alkylbenzenesulfonate, alkylnaphthalenesulfonate, alkylbenzimidazolesulfonate, N-acyl-N-methyltaurine salt, acyloxyethanesulfonate, alkoxyethanesulfonic acid, N -Acyl-N-carboxyethyltaurine or its salt, and one or more selected from alkyl or alkenylamino carboxymethyl sulfate and the like.

Cationic surfactants include alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylquaternary ammonium salts, mono- or dialkylquaternary ammonium salts containing ether groups, ester groups or amide groups, alkylpyridinium salts, and alkyldimethylbenzylammonium salts. One or more selected from salts, alkylisoquinolinium salts, dialkylmorphonium salts, polyoxyethylenealkylamines, alkylamine salts, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzalkonium chloride, benzethonium chloride, etc. mentioned.
Compounds obtained by changing the alkyl group of the compounds exemplified above as cationic surfactants to alkenyl groups are also exemplified as cationic surfactants that can be used in the present invention.

Amphoteric surfactants include alkylbetaine type amphoteric surfactants such as lauryldimethylbetaine, lauryldiethylbetaine, stearyldimethylbetaine, oleyldimethylbetaine, and lauryldihydroxyethylbetaine, N-coconut fatty acid acyl-N-carboxymethyl-N- Hydroxyethylethylenediamine sodium (2-cocoalkyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine), N-coconut fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, N-tallow fatty acid acyl-N-carboxy Imidazolium betaine type amphoteric surfactants such as methyl-N-hydroxyethylethylenediamine sodium, N-tallow fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, lauramidopropyl betaine, stearamide propyl betaine, olein Amidopropyl betaine type amphoteric surfactants such as acid amidopropyl betaine, amino acid type amphoteric surfactants such as sodium laurylaminopropionate, sodium oleylaminopropionate, sodium laurylaminodipropionate, sodium oleylaminodipropionate, etc. One or more selected types are included.

Scale inhibitors include organic phosphonic acids such as 2-phosphonobutane-1,2,4-tricarboxylic acid, 1-hydroxyethylidene-1,1-diphosphonic acid and 1-hydroxypropylidene-1,1-diphosphonic acid or salts thereof, organic phosphinic acids such as bis(poly-2-carboxyethyl)phosphinic acid and phosphinocarboxylic acid copolymers and/or salts thereof, condensed phosphoric acids such as sodium tripolyphosphate and potassium tripolyphosphate or salts thereof, etc. One or more selected from The scale inhibitors may be used alone or in combination of two or more.

Examples of the oxidizing agent include hypochlorites such as sodium hypochlorite and potassium hypochlorite, chlorites such as sodium chlorite and potassium chlorite, and chlorine such as sodium chlorate and potassium chlorate. perchlorates such as sodium perchlorate and potassium perchlorate; chlorinated isocyanurates such as chlorinated sodium isocyanurate and chlorinated potassium isocyanurate; chlorine dioxide; species or more. The oxidizing agents may be used alone or in combination of two or more. Among them, sodium hypochlorite is preferable from the point of view of economy.

Examples of pH adjusters include acetic acid, hydrochloric acid, sulfuric acid, nitric acid, citric acid, phosphoric acid, sodium acetate, sodium carbonate, sodium citrate, sodium hydrogen citrate, sodium phosphate, sodium hydrogen phosphate, and the like. One or more types are mentioned. The pH adjusters may be used alone or in combination of two or more.

The deodorizing component is one selected from cyclodextrins such as α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, hydroxypropyl-β-cyclodextrin, methyl-β-cyclodextrin, and highly branched cyclodextrin. The above are mentioned. By using nonionic surfactants together with these dextrins, better deodorizing properties can be exhibited. In order to exhibit a good deodorizing effect, the nonionic surfactant used in combination with the above-described one or more dextrins includes those appropriately selected from the above-described nonionic surfactants. It is preferable to select one or more selected from alkylene alkyl ethers, pluronic surfactants, and alkyl polyglucosides.
In 100% by mass of the alkaline detergent composition for CIP of the present invention, the deodorant component described above is preferably contained in an amount of 0.1% by mass or more and 10% by mass or less, and 0.2% by mass or more and 8% by mass. It is more preferable that the content is less than or equal to 0.3% by mass or more and 5% by mass or less. If it is less than 0.1% by mass, the deodorizing property may not be improved, and if it exceeds 10% by mass, no further deodorizing effect can be expected.

Examples of enzymes include amylase, protease, lipase, cellulase, glucanase and the like.

Pigments include, for example, natural pigments, synthetic pigments, and mixtures thereof. Examples of perfumes include natural perfumes, synthetic perfumes, blended perfumes thereof, and the like.

Metal corrosion inhibitors include triazoles such as benzotriazole, tolyltriazole and mercaptobenzothiazole, and organic acid salts such as adipate, glutarate, succinate and citrate. The metal corrosion inhibitors may be used alone or in combination of two or more.

From the viewpoint of exhibiting a higher metal corrosion inhibitory effect while maintaining good detergency, the alkaline detergent composition for CIP of the present invention contains the above-described components (A) and (C) in a mass ratio of The value of (A) / (C) is preferably contained at a ratio of 5 or more and 4000 or less, more preferably 10 or more and 500 or less, and a ratio of 15 or more and 200 or less and more preferably 25 or more and 150 or less.
If the value of the mass ratio (A)/(C) is less than 5, the detergency or storage stability may not be sufficient, and if it exceeds 4000, the storage stability will decrease, or when used at extremely high temperatures. In some cases, the effect of preventing metal corrosion may not be sufficiently exhibited.

From the viewpoint of exhibiting a better balance between storage stability and the effect of preventing metal corrosion when used at ultra-high temperatures, the alkaline detergent composition for CIP of the present invention contains the above-described components (B) and (C ) component, the value of the mass ratio (B) / (C) is preferably 0.05 or more and 1000 or less, more preferably 1 or more and 100 or less, It is more preferable to contain at a ratio of 3 or more and 20 or less.
When the value of the mass ratio (B)/(C) is less than 0.05, the storage stability may be deteriorated, or scale generation may become significant. Or, when used at ultra-high temperatures, the metal corrosion prevention property may not be sufficiently exhibited.

Next, the CIP cleaning method of the present invention will be described.
The CIP cleaning method of the present invention includes an alkaline cleaning step using the above-described alkaline cleaning agent composition for CIP of the present invention.
In the alkaline cleaning step, a cleaning liquid obtained by diluting the alkaline cleaning composition for CIP of the present invention with water or hot water so that the component (C) is 0.001% by mass or more and 1% by mass or less is used. In the CIP cleaning method of the present invention, the cleaning solution is heated to 110° C. or higher to carry out the alkaline cleaning step. In other words, in the CIP cleaning method of the present invention, it is necessary to cool the temperature inside the manufacturing equipment, which is the object to be cleaned, to a temperature of 100° C. or less, as before performing the alkali cleaning step in the conventional CIP cleaning. Therefore, it is possible to carry out the alkali cleaning process without fear of metal corrosion in a high temperature environment exceeding 100° C., particularly in an ultra-high temperature environment. Since the time and cost conventionally required for cooling are thus reduced, the CIP cleaning method of the present invention reduces the cleaning time and costs.

In the CIP cleaning method of the present invention, the heating of the cleaning liquid to 110° C. or higher means a mode in which the cleaning liquid preheated to 110° C. or higher is filled into the inside of the manufacturing equipment or the like, which is the object to be cleaned. The temperature inside the manufacturing equipment, etc., which is a physical object, is 110° C. or higher, and the interior of the manufacturing equipment, etc. is heated to 110° C. or higher by filling the inside of the manufacturing equipment with a cleaning liquid having a temperature of less than 110° C. There may be.

The alkali cleaning step in the CIP cleaning method of the present invention can be carried out in a high-temperature environment in which the temperature inside the manufacturing equipment, which is the object to be cleaned, exceeds 100°C, and is carried out in an ultra-high temperature environment of 110°C or higher. is preferred, and it is more preferred to be carried out in an ultra-high temperature environment of 115°C or higher. On the other hand, the upper limit of the temperature in the manufacturing equipment, etc. in the alkali washing step in the present invention is not particularly limited, and the alkali washing step is the same temperature as the heat sterilization performed in the final process of the manufacturing equipment, etc., which is the object to be cleaned. It is preferable to carry out under the following temperature environment, for example, 150° C. or less is preferable.

The CIP cleaning method of the present invention includes both an aspect in which substantially only an alkali cleaning step is performed and an aspect in which an alkali cleaning step and an acid cleaning step and/or a sterilization step are performed.
For example, in the CIP cleaning method of the present invention including an acid cleaning step, by selecting phosphoric acid or the like as an acid component contained in the acid cleaning agent composition for CIP used in this method, not only the alkali cleaning step but also The acid wash step is also preferred because it can be carried out at very high temperatures.
Further, in the CIP cleaning method of the present invention, the alkali cleaning process can be performed at an ultra-high temperature, so that in the alkali cleaning process, sterilization treatment can be performed at the same time as the alkali cleaning. Therefore, the CIP cleaning method of the present invention can omit the sterilization step. On the other hand, the CIP cleaning method of the present invention can exhibit a very high sterilization effect by performing a sterilization step in addition to the alkali cleaning step performed at an ultra-high temperature.

In addition, when the alkali cleaning step in the CIP cleaning method of the present invention is carried out in an ultra-high temperature environment of 110 ° C. or higher, the effect of removing the flavor odor adhering to the packing part (seal part) of the pipe connecting part ( deodorizing effect) is also exhibited. In order to fully remove flavor odors, it is usually necessary to wash thoroughly and require a great deal of labor. The deodorizing and cleaning method of the present invention includes both an aspect in which substantially only an alkali cleaning step is performed and an aspect in which an alkali cleaning step and an acid cleaning step and/or a sterilization step are performed.

In order to obtain a more excellent deodorizing effect, it is preferable to blend one or more of the above-described nonionic surfactants and deodorant components, and one or more nonionic surfactants and one or more deodorants such as cyclodextrins are used. It is more preferred to combine both components. A wide range of flavors such as terpene hydrocarbons, esters, aliphatic higher alcohols, aromatic alcohols, aliphatic higher aldehydes, aromatic aldehydes, and lactones can be produced by blending nonionic surfactants and cyclodextrins. The odor can be satisfactorily deodorized from the packing part.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples and comparative examples. Tables 1 to 5 below show the components and amounts used in the CIP alkaline detergent compositions of Examples and Comparative Examples. In addition, the numerical value of the composition of the examples and comparative examples in the table represents the mass % of the pure content.
In addition, using the CIP alkaline detergent compositions shown in Tables 1 to 5, tests and evaluations were carried out for detergency, scale removal, metal corrosion prevention, and storage stability. Evaluation results in each test are shown in Tables 1-5.

(A) Component A-1: sodium hydroxide A-2: potassium hydroxide

(B) Component B-1: trisodium methylglycine diacetate B-2: trisodium glutamic acid diacetate

Comparative component B'-1 of component (B): tetrasodium ethylenediaminetetraacetate

(C) Component C-1: Olefin-maleic acid copolymer sodium 1 (trade name: Sokalan CP9, manufactured by BASF, weight average molecular weight 12,000)
C-2: Olefin-maleic acid copolymer sodium 2 (trade name: Acusol 460N, manufactured by Dow Chemical Company, weight average molecular weight 10,000)

Comparative component C′-1 of component (C): sodium polyacrylate (trade name: Aqualic YS100, manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight 5,500)
C'-2: Acrylic acid/maleic acid copolymer sodium 1 (trade name: Aqualic TL213, manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight 10,000)
C′-3: acrylic acid/maleic acid copolymer sodium 2 (trade name: Sokalan CP5, manufactured by BASF, weight average molecular weight 70,000)
C′-4: Acrylic acid/maleic acid copolymer sodium 3 (trade name: Sokalan CP12S, manufactured by BASF, weight average molecular weight 3,000)

(D) Component D-1: ion-exchanged water

(E) Other components E-1: Pluronic-type nonionic surfactant 1 (trade name: Adeka Pluronic 25R-1, manufactured by ADEKA)
E-2: Polyoxyalkylene alkyl ether 1 (trade name: Adekatol LB-83, manufactured by ADEKA)
E-3: Sodium 2-phosphonobutane-1,2,4-tricarboxylate E-4: Sodium 1-hydroxyethylidene-1,1-diphosphonate E-5: Polyoxyalkylene alkyl ether 2 (trade name: Adecanol B- 2020, manufactured by ADEKA)
E-6: Polyoxyalkylene alkyl ether 3 (trade name: Plurafac LF-403, manufactured by BASF)
E-7: Pluronic-type nonionic surfactant 2 (trade name: ADEKA Pluronic L-61, manufactured by ADEKA)
E-8: Alkyl polyglucoside (trade name: Glucopon 215UP, manufactured by BASF)
E-9: α-cyclodextrin E-10: hydroxypropyl-β-cyclodextrin

*1: Detergency test 1
Test method:
Measure the mass of a stainless steel piece (6 cm × 7 cm rectangle, 1 mm thick SUS316L piece), spray 0.5 mL of milk as dirt (0.5 g of dirt attached), and heat at 130 ° C. for 10 minutes. The mass was measured using the test piece to which the stain was adhered. This test piece was completely immersed in 300 mL of a cleaning solution prepared by diluting each alkaline detergent composition for CIP to 3% by mass, left standing at 80° C. for 20 minutes for cleaning, and then rinsed with deionized water. The mass was measured after drying for 30 minutes at °C.
The difference in mass between the test piece before cleaning and the stainless steel piece before dirt adheres is defined as the amount of dirt adhered, and the cleaning rate is calculated from the change in mass of the test piece before and after cleaning using the following formula (1). evaluated the sex.

[Number 1]
Cleaning rate (%) = {(mass of test piece before cleaning - mass of test piece after cleaning) / (amount of dirt adhering)} x 100 (1)

Evaluation criteria:
A: Detergency rate is 80% or more (excellent detergency).
○: Detergency rate of 70% or more and less than 80% (good detergency).
Δ: Detergency rate of 60% or more and less than 70% (with detergency).
x: Washing rate less than 60% (poor washability).
, and △, ◯, and ⊚ were judged to be practical.

*1: Detergency test 2
Test method:
Measure the mass of a stainless steel piece (6 cm × 7 cm rectangle, 1 mm thick SUS316L piece), spray 0.5 mL of milk as dirt (0.5 g of dirt attached), and heat at 130 ° C. for 10 minutes. The mass was measured using the test piece to which the stain was adhered. This test piece was completely immersed in 300 mL of a cleaning solution prepared by diluting each CIP alkaline cleaning composition to 3% by mass, left standing at 130° C. for 10 minutes in an autoclave for cleaning, and then washed with deionized water. After rinsing and drying at 105° C. for 30 minutes, the weight was determined.
The difference in mass between the test piece before cleaning and the stainless steel piece before dirt adheres is defined as the amount of dirt adhered, and the cleaning rate is calculated from the change in mass of the test piece before and after cleaning using the following formula (1). evaluated the sex.

[Number 2]
Cleaning rate (%) = {(mass of test piece before cleaning - mass of test piece after cleaning) / (amount of dirt adhering)} x 100 (1)

Evaluation criteria:
A: Detergency rate is 80% or more (excellent detergency).
○: Detergency rate of 70% or more and less than 80% (good detergency).
Δ: Detergency rate of 60% or more and less than 70% (with detergency).
x: Washing rate less than 60% (poor washability).
, and △, ◯, and ⊚ were judged to be practical.

*2: Scale removal test test method:
A stainless steel piece (2 cm x 7 cm rectangle, 1 mm thick SUS304 piece) was prepared and the mass was measured. 100 g of distilled water was placed in a beaker, and 2.5 g of calcium hydroxide and 0.75 g of calcium carbonate were added and dissolved to prepare an aqueous solution for testing. The stainless steel piece was completely immersed in a beaker containing the above aqueous solution and heated at 105 ° C. for 30 minutes, then the stainless steel piece with calcium scale was removed from the beaker and dried at 105 ° C. for 30 minutes. The mass of the specimen was measured. This test piece was completely immersed in 100 mL of a cleaning solution prepared by diluting each alkaline detergent composition for CIP to 3% by mass, heated at 80° C. for 20 minutes for cleaning, then taken out and rinsed with deionized water. , 105° C. for 30 minutes before weighing.
The difference in mass between the test piece before washing and the stainless steel piece before scale adhesion is defined as the amount of scale adhesion, and the scale removal rate is calculated from the following formula (2) from the change in the mass of the test piece before and after washing, and the following evaluation criteria are used. Descaling properties were evaluated.

[Number 3]
Scale removal rate (%) = {(mass of test piece before cleaning - mass of test piece after cleaning) / (amount of scale adhered)} x 100 (2)

Evaluation criteria:
A: Scale removal rate of 80% or more (excellent in scale removal).
○: Scale removal rate of 70% or more and less than 80% (scalability is good).
Δ: Scale removal rate of 60% or more and less than 70% (with scale removal property).
x: Scale removal rate less than 60% (poor scale removal).
, and evaluation criteria of Δ, ◯, and ⊚ were judged to be practical.

*3: Metal corrosion prevention test 1
Test method:
Stainless steel: SUS304 10 mm pipe (IDF/ISO standard; 1.5S) and stainless steel: SUS304 40 mm pipe (IDF/ISO standard; 1.5S) are welded to a total length of 50 mm Stainless steel: SUS304 welded pipe, and Stainless steel: SUS316L 10 mm pipe (IDF/ISO standard; 1.5S) and stainless steel: SUS316L 40 mm pipe (IDF/ISO standard; 1.5S) are welded to a total length of 50 mm. Seeds that had been previously washed with a neutral detergent, treated with acetone and dried were used as test samples. 100 mL of the cleaning solution prepared by diluting each CIP alkaline cleaning composition to 3% by mass with hard water having a hardness of 75 mg/L [German hardness 4.2° DH] in terms of calcium carbonate was placed in a 100 mL polypropylene container, The above test sample was completely immersed therein and stored in a thermostat at 25° C. for 24 hours. After the storage, the test sample was taken out, rinsed with deionized water, dried, and the state of the test sample surface was visually observed to evaluate the metal corrosion inhibitory property at normal temperature according to the following evaluation criteria.

Evaluation criteria:
○: No corrosion.
Δ: Slightly corroded, but no problem in use.
x: Remarkable corrosion was observed.
, and △ and ◯ were judged to be practical.

*3: Metal corrosion prevention test 2
Test method:
Stainless steel: SUS304 10 mm pipe (IDF/ISO standard; 1.5S) and stainless steel: SUS304 40 mm pipe (IDF/ISO standard; 1.5S) are welded to a total length of 50 mm Stainless steel: SUS304 welded pipe, and Stainless steel: SUS316L 10 mm pipe (IDF/ISO standard; 1.5S) and stainless steel: SUS316L 40 mm pipe (IDF/ISO standard; 1.5S) are welded to a total length of 50 mm. Seeds that had been previously washed with a neutral detergent, treated with acetone and dried were used as test samples. 250 mL of the cleaning liquid prepared by diluting each CIP alkaline cleaning composition to 3% by mass with hard water having a hardness of 75 mg/L [German hardness 4.2° DH] in terms of calcium carbonate was placed in a 250 mL heat-resistant container, A series of steps were performed in which the above test sample was completely immersed therein and then kept in an autoclave at 135° C. for 16 hours. After completion of the above steps, the test sample was taken out of the washing solution, rinsed with deionized water and dried at room temperature for 2 hours. In this way, the series of steps described above was repeated eight times, and the heat treatment was performed in the autoclave for a total of 128 hours. The test sample after the heat treatment in the eighth step was taken out, rinsed with ion-exchanged water, dried, and the state of the test sample surface was visually observed. Metal corrosion inhibition properties were evaluated.

Evaluation criteria:
○: No corrosion.
Δ: Slightly corroded, but no problem in use.
x: Remarkable corrosion was observed.
, and △ and ◯ were judged to be practical.

*4: Storage stability test test method:
100 mL of each alkaline detergent composition for CIP was placed in a 100 mL capacity polypropylene container and allowed to stand in a temperature environment of −5° C., 25° C., and 40° C. for 1 month. evaluated the sex.

Evaluation criteria:
◯: Stable with no separation or turbidity observed.
Δ: There is no overall separation, but some turbidity is observed.
x: Separation or turbidity is observed.
, and △ and ◯ were judged to be practical.

*5: Anti-foaming test method:
100 mL of diluted cleaning solution was prepared by diluting each CIP alkaline cleaning composition to 2% by mass with hard water of 75 mg/L [German hardness 4.2° DH] in terms of calcium carbonate, and heated to 80°C. After that, 0.5 g of skimmed milk was added. Next, the skim milk was stirred until it was completely dissolved, and 20 g of the mixture was placed in an Epton tube with a 100 mL glass stopper and heated to 80°C in a hot water bath. After that, it was shaken up and down 60 times at a rate of 1 time per second, and after standing for 1 minute while being held at 80°C, the height from the surface of the detergent aqueous solution to the top of the foam (foam height) was measured. was measured, and the antifoaming property was evaluated according to the following criteria.

Evaluation criteria:
○: Foam height is less than 15 mm.
(triangle|delta): Foam height is 15 mm or more and less than 20 mm.
x: Foam height is 20 mm or more.
, and △ and ◯ were judged to be practical.

*6: Deodorizing test
Test method:
An EPDM packing (square with a side of 5 cm and a thickness of 5 mm) was completely immersed in each test beverage and allowed to stand at 100° C. for 8 hours as a test piece. A grapefruit drink, an apple drink, and a banana au lait drink were used as test drinks.
A 3% by mass diluted solution of each CIP alkaline detergent composition was prepared using ion-exchanged water. 200 mL of each diluted solution is placed in a heat-resistant container with a capacity of 250 mL, and one packing of the deodorizing test specimen prepared by the above method is put into each heat-resistant container, and the temperature is maintained in an autoclave at 121 ° C. A step of holding for 1 minute was performed. After that, the packing was thoroughly rinsed with tap water, put into a 100 mL transparent polypropylene container containing 100 mL of ion-exchanged water, and extracted at 80 ° C. for 1 hour. and
Evaluation method:
The odor of the test water was evaluated by 10 panelists according to the following four grades. It can be said that the lower the score, the better the deodorizing effect. The total score of evaluation points by 10 panelists was evaluated as "smell persistence". Judgment criteria are as follows.
[Evaluation point criteria]
1 point: No flavor odor of the beverage.
2 points: Slight flavor odor.
3 points: Slightly strong flavor odor.
4 points: Strong flavor odor.
"Odor retention"
A: The total score is less than 16 points.
O: The total score is 16 or more and less than 22 points.
Δ: The total score is 22 or more and less than 28 points.
x: The total score is 28 points or more.
, and ◎, 〇 and △ were considered practical.

The above embodiments include the following technical ideas.
(1) an alkali metal hydroxide as the component (A);
(B) at least one selected from methylglycine diacetic acid and/or its salts and glutamic acid diacetic acid and/or its salts as the component;
(C) as a component, an olefin-maleic acid copolymer or a salt thereof;
An alkaline detergent composition for CIP, containing water as component (D).
(2) The alkaline detergent composition for CIP according to (1) above, wherein the component (B) is methylglycine diacetic acid and/or a salt thereof.
(3) The alkaline detergent composition for CIP according to either (1) or (2) above, wherein component (C) is an olefin-maleic acid copolymer having a weight average molecular weight of 8000 or more and 50000 or less or a salt thereof. thing.
(4) The above (1) to (3), wherein the mass ratio (A)/(C) of the components (A) and (C) is 5 or more and 4000 or less. ), the alkaline detergent composition for CIP according to any one of ).
(5) From the above (1), wherein the mass ratio (B)/(C) of the component (B) and the component (C) is 0.05 or more and 1000 or less. The alkaline detergent composition for CIP according to any one of (4).
(6) The CIP alkaline cleaning composition according to any one of (1) to (5) above is diluted with water or hot water so that the component (C) is 0.001% by mass or more and 1% by mass or less. A CIP cleaning method characterized by heating a cleaning solution diluted to a temperature of 110° C. or higher and using it in an alkali cleaning step.

Claims (6)

(A) an alkali metal hydroxide as a component,
(B) at least one selected from methylglycine diacetic acid and/or its salts and glutamic acid diacetic acid and/or its salts as the component;
(C) as a component, an olefin-maleic acid copolymer or a salt thereof;
An alkaline detergent composition for CIP, containing water as component (D). 2. The alkaline detergent composition for CIP according to claim 1, wherein the component (B) is methylglycinediacetic acid and/or its salt. 3. The alkaline detergent composition for CIP according to claim 1, wherein component (C) is an olefin-maleic acid copolymer having a weight average molecular weight of 8000 or more and 50000 or less or a salt thereof. 4. The alkali cleaning for CIP according to claim 3, wherein the component (A) and the component (C) are contained in such a ratio that the mass ratio (A)/(C) is 5 or more and 4000 or less. agent composition. 4. The CIP according to claim 3, wherein the component (B) and the component (C) are contained in such a ratio that the mass ratio (B)/(C) is 0.05 or more and 1000 or less. Alkaline detergent composition. The alkaline detergent composition for CIP according to claim 1 is diluted with water or hot water so that the component (C) is 0.001% by mass or more and 1% by mass or less. A CIP cleaning method, characterized in that it is heated and used in an alkali cleaning step.