JP2015074668A - Detergent composition for acidic cip and cip cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detergent composition for acidic CIP excellent in scale cleaning property, rubber packing compatibility, metal corrosion property and storage stability with overcoming danger of corrosion of stainless materials used in a manufacturing facility or manufacturing equipment or curing or cracking of rubber packing by conventional detergent compositions for CIP cleaning having good scale cleaning property for cleaning scales attached to the facility or the like in a CIP cleaning for cleaning without decomposing the manufacturing facility or manufacturing equipment in a manufacturing plant for foods and drinks or the like.SOLUTION: The detergent composition for acidic CIP contains (A) methansulfonic acid of 1 pts.mass and (B) citric acid of 0.01 to 0.4 pts.mass.

Description

  The present invention relates to an acidic CIP cleaning composition and a CIP cleaning method using the same. Specifically, the present invention relates to an acidic CIP cleaning composition used for cleaning manufacturing equipment and manufacturing equipment such as food and beverage factories, and a CIP cleaning method using the same.

  In food factories, beverage factories, etc., cleaning is performed by CIP cleaning for manufacturing equipment and manufacturing equipment. CIP cleaning is an acronym for “Cleaning in place”. Without disassembling the manufacturing equipment and manufacturing equipment, the cleaning liquid is circulated as it is to fill and circulate the interior. This is a cleaning method for cleaning and removing residual dirt by spraying a cleaning liquid, and is also called stationary cleaning or stationary circulation cleaning. For this CIP cleaning, an alkali cleaning agent, an acid cleaning agent, a disinfectant, and the like are used. In general: 1. water washing; 2. alkali cleaning; 3. rinse with water 4. Acid cleaning, 5. rinse with water 6. sterilization, Although it is carried out in a process of rinsing with water, some parts may be omitted, the order may be changed, or the same process may be repeated depending on the composition of the cleaning agent and the type and condition of the dirt. . Moreover, the stain | pollution | contamination which becomes object is a food residue, and organic stain | pollution | contamination, such as protein, fats and carbohydrates, and inorganic stain | pollution | contamination, such as a calcium carbonate, a calcium phosphate, and a calcium silicate, are mentioned. Furthermore, there are some organic soils that are heat-denatured and strong as found in sterilizers.

  In the CIP cleaning, nitric acid has been widely used as an acid used in the acid cleaning process. However, nitric acid is a strong acid and has an oxidizing power. For this reason, for example, when CIP cleaning of manufacturing equipment, piping lines, piping connections, heat exchangers, filling machines, etc., the rubber packing used in the equipment, etc., cracks and hardens, and the rubber packing Influences such as corrosion.

  Therefore, in recent years, an acid detergent composition that uses sulfamic acid instead of nitric acid as an acid and is used in combination with urea for stabilizing sulfamic acid has been proposed for CIP cleaning of food production facilities (for example, patents) Reference 1). Further, for the purpose of removing solid deposits from drinking water piping, it has been proposed that a cleaning agent containing sulfamic acid, methanesulfonic acid, phosphonobutane-tricarboxylic acid, and 2-propanol at a specific ratio is effective (Patent Literature). 2). Furthermore, as an acid cleaning agent for boiled noodles (Patent Document 3) containing methanesulfonic acid, nitric acid and phosphoric acid, or an acid cleaning agent for removing scales attached to the surface of hard materials, hydroxy such as methanesulfonic acid and citric acid It has also been proposed to use a mixture with carboxylic acid (Patent Document 4).

JP 2004-217827 A JP 2008-266562 A JP 2011-32396 A JP 2013-31823 A

However, the cleaning agents described in Patent Documents 1 to 3 have a problem that the rubber packing has an effect of cracking and hardening, or corrodes a stainless steel material used for equipment and the like. There was nothing that satisfied both. Moreover, although the acidic cleaning agent described in Patent Document 4 is not corrosive to metals, when it is highly concentrated like a CIP cleaning agent, storage stability is lowered, and it can be easily made into a high concentration cleaning agent. Because it was not possible, it was unsatisfactory in terms of manufacturing, container and transportation costs, as well as the resulting reduction in carbon dioxide emissions. In addition, in the CIP cleaning process, when a drying process is performed between the acid cleaning process and the alkali cleaning process as described in Patent Document 4, the dirt once cleaned by the acid cleaning liquid or the alkali cleaning liquid is removed after the drying process. There is a problem that it remains attached to the equipment.
Therefore, the problem to be solved by the present invention is a cleaning composition for acidic CIP having excellent scale cleaning properties, rubber packing compatibility, metal corrosivity, and good storage stability even at a high concentration, and the use thereof. The object is to provide a CIP cleaning method.

  In order to solve the above-mentioned problems, the present inventors have intensively studied and selected and combined specific compounds such as methanesulfonic acid and citric acid, and combined citric acid with a specific ratio to methanesulfonic acid. As a result, it is possible to obtain an acidic CIP cleaning composition having excellent storage stability even when the concentration of methanesulfonic acid and citric acid is increased, and also excellent in scale detergency. The present inventors have found that the problem of corrosiveness to metals and corrosiveness to rubber, which the cleaning composition has, can be solved simultaneously, and the present invention has been completed.

That is, the present invention
(1) It contains (A) methanesulfonic acid and (B) citric acid, and (A) contains 0.01 to 0.4 parts by mass of (B) with respect to 1 part by mass. A cleaning composition for acidic CIP,
(2) The cleaning composition for acidic CIP of (1) above, further comprising (C) phosphoric acid and / or organic phosphonic acid,
(3) The acidic CIP cleaning composition according to any one of (1) to (2) above, further comprising (D) a nonionic surfactant,
(4) The cleaning composition for acidic CIP of any one of (1) to (3) above, wherein the total proportion of evaporation residues in the composition is 40 to 80% by mass,
(5) In the acid cleaning step, the acidic CIP cleaning composition according to any one of (1) to (4) is diluted as an aqueous solution so that the concentration of the component (A) is 0.01 to 5% by mass. 1) Rinse washing with water, 2) Alkaline washing, 3) Rinsing washing with water, 4) Acid washing, 5) Rinsing washing with water, each step of 1) to 5) CIP cleaning method characterized by sequentially performing cleaning without performing a drying process between processes,
(6) In the acid cleaning step, the acidic CIP cleaning composition according to any one of (1) to (4) is diluted as an aqueous solution so that the concentration of the component (A) is 0.01 to 5% by mass. 1) Rinse washing with water, 2) Acid washing, 3) Rinsing washing with water, 4) Alkaline washing, 5) Rinsing washing with water, each step of 1) to 5) CIP cleaning method characterized by sequentially performing cleaning without performing a drying process between processes,
Is a summary.

  The acidic CIP cleaning composition of the present invention and the CIP cleaning method using the same have effects such as excellent scale cleaning properties, rubber packing compatibility, metal corrosivity, and good storage stability.

The acidic CIP cleaning composition of the present invention contains methanesulfonic acid as the component (A) and citric acid as the component (B).
The acidic CIP cleaning composition of the present invention contains 0.01 to 0.4 parts by mass of the (B) component citric acid per 1 part by mass of the (A) component methanesulfonic acid. It is preferable to mix | blend 05-0.3 mass part, and it is more preferable to mix | blend 0.1-0.2 mass part. When the amount of citric acid of the component (B) is less than 0.01 parts by mass with respect to 1 part by mass of the component (A), the metal corrosion resistance and the rubber packing compatibility are deteriorated, and when the amount exceeds 0.4 parts by mass. In some cases, the scale washability with respect to calcium phosphate is reduced, or high concentration cannot be achieved.

When the acidic CIP cleaning composition of the present invention contains phosphoric acid and / or organic phosphonic acid as component (C) in addition to the components (A) and (B), scale cleaning is performed. , In particular, iron scale detergency is improved.
The organic phosphonic acid of component (C) is a compound containing at least one phosphonic acid group in the molecule, specifically, methyldiphosphonic acid, ethylidene diphosphonic acid, 1-hydroxyethylidene-1, 1-diphosphonic acid, 1-hydroxypropylidene-1,1-diphosphonic acid, 1-hydroxybutylidene-1,1-diphosphonic acid, ethylaminobis (methylenephosphonic acid), dodecylaminobis (methylenephosphonic acid), ethylenediamine Bis (methylenephosphonic acid), aminotri (methylenephosphonic acid), ethylenediaminetetra (methylenephosphonic acid), 1,2-propylenediaminetetra (methylenephosphonic acid), hexamethylenediaminetetra (methylenephosphonic acid), cyclohexanediaminetetra (methylene Phosphonic acid), g Cole ether diamine tetra (methylene phosphonic acid), diethylene triamine penta (methylene phosphonic acid), triethylene tetramine hexa (methylene phosphonic acid), tri (2-aminoethyl) amine hexa (methylene phosphonic acid), tetraethylene pentamine hepta (methylene phosphonic acid) Acid), pentaethylenehexamine octa (methylene phosphonic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid, aminotrimethylene phosphonic acid, and the like. Among these, from the viewpoint of scale detergency, 1-hydroxy Ethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, aminotri (methylenephosphonic acid), and ethylenediaminetetra (methylenephosphonic acid) are preferred.

  When (A) component and (B) component are combined with phosphoric acid and / or organic phosphonic acid of (C) component, (C) component is based on 1 part by weight of methanesulfonic acid of (A) component. It is preferable to mix | blend 0.05-1 mass part, It is more preferable to mix | blend 0.1-0.8 mass part, It is still more preferable to mix | blend 0.2-0.6 mass part. (A) When the amount of phosphoric acid and / or organic phosphonic acid is less than 0.05 parts by mass relative to 1 part by mass of the component, the scale washability of calcium phosphate may deteriorate, and the amount exceeds 1 part by mass. However, no further effect can be expected.

  The acidic CIP cleaning composition of the present invention preferably further contains a nonionic surfactant as component (D). As the nonionic surfactant of component (D), polyoxyalkylene alkyl ether, polyoxyalkylene dialkyl ether, polyoxyalkylene alkyl ester, polyoxyalkylene alkyl diester, polyoxyalkylene alkyl aryl ether, glycerin fatty acid ester or ethylene oxide thereof Additives, 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, polyoxyethylene castor oil, polyoxy Ethylene hydrogenated castor oil, polyoxyethylene alkylamine, higher fatty acid alkanolamide Alkylglycosides, and alkylamine oxides. Among these, polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene polyoxypropylene alkyl ether, and polyalkylene oxide adducts such as random or block adducts of ethylene oxide and propylene oxide are preferable from the viewpoint of less foaming. .

  When the nonionic surfactant that is the component (D) is blended, the component (D) is preferably blended in an amount of 0.001 to 0.1 parts by mass with respect to 1 part by mass of (A) methanesulfonic acid. It is more preferable to mix 01-0.05 mass part, and it is still more preferable to mix 0.02-0.01 mass part. When the blending amount of the component (D) is less than 0.001 part by mass per 1 part by mass of the component (A), the detergency with respect to organic dirt may not be obtained. Since there is a possibility of increasing, it is not preferable.

  The acidic CIP cleaning composition of the present invention contains components usually used in the technical field according to the formulation form of the acidic CIP cleaning composition, as long as the effects of the present invention are not impaired. Also good. Examples of such components include other acid components other than the components (A), (B) and (C), and surfactants such as anionic surfactants, cationic surfactants, and amphoteric surfactants. , Antifoaming agents, organic solvents, thickeners, fragrances, pigments, preservatives and the like.

  Examples of other acid components other than the component (A), the component (B), and the component (C) include phosphoric acid, glycolic acid, lactic acid, malic acid, gluconic acid, tartaric acid, oxalic acid, malonic acid, succinic acid, Examples include acetic acid, isethionic acid, and adipic acid.

  Examples of the anionic surfactant include higher alcohol sulfates, sulfurized olefins, higher alkyl sulfonates, α-olefin sulfonates, sulfated fatty acid salts, sulfonated fatty acid salts, phosphate ester salts, and fatty acid esters. Sulfate ester, glyceride sulfate ester, fatty acid ester sulfonate, α-sulfo fatty acid methyl ester salt, polyoxyalkylene alkyl ether sulfate ester, polyoxyalkylene alkyl phenyl ether sulfate ester, fatty acid alkanolamide or alkylene oxide thereof Sulfuric acid ester salts of adducts, sulfosuccinic acid esters, alkylbenzene sulfonates, alkylnaphthalene sulfonates, alkylbenzimidazole sulfonates, N-acyl-N-methyltaurine salts, Examples thereof include siloxyethane sulfonate, alkoxyethane sulfonic acid, N-acyl-N-carboxyethyl taurine or a salt thereof, and alkyl or alkenylaminocarboxymethyl sulfate.

  Examples of the cationic surfactant include alkyl (alkenyl) trimethyl ammonium salt, dialkyl (alkenyl) dimethyl ammonium salt, alkyl (alkenyl) quaternary ammonium salt, mono- or dialkyl (alkenyl) containing ether group, ester group or amide group. ) Quaternary ammonium salt, alkyl (alkenyl) pyridinium salt, alkyl (alkenyl) dimethylbenzyl ammonium salt, alkyl (alkenyl) isoquinolinium salt, dialkyl (alkenyl) morphonium salt, polyoxyethylene alkyl (alkenyl) amine, alkyl (alkenyl) amine Examples thereof include salts, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzalkonium chloride, and benzethonium chloride.

  Examples of the amphoteric surfactant include alkylbetaine-type amphoteric surfactants such as lauryl dimethyl betaine, lauryl diethyl betaine, stearyl dimethyl betaine, oleyl dimethyl betaine, lauryl dihydroxyethyl betaine; 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 -Carboxymethyl-N-hydroxyethylethylenediamine sodium, N-tallow fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, etc. Midazolium betaine type amphoteric surfactants; amidopropyl betaine type amphoteric surfactants such as amidopropyl betaine laurate, amidopropyl stearate, amidopropyl betaine oleate; sodium laurylaminopropionate, sodium oleylaminopropionate, Amino acid type amphoteric surfactants such as sodium laurylaminodipropionate and sodium oleylaminodipropionate can be mentioned.

  Examples of the antifoaming agent include silicone-based antifoaming agents such as silicone, polyether-modified silicone, alkyl-modified silicone, and silicone-based emulsions using these silicone substances; polyether-based antifoaming agents and the like. These antifoaming agents are preferably added in such an amount that the concentration in the acidic detergent composition of the present invention is 0.0001 to 1% by mass, and is added in an amount to be 0.0003 to 0.5% by mass. More preferably.

  Examples of the organic solvent include lower alcohols such as ethanol, propanol, and butanol, glycols such as ethylene glycol, propylene glycol, and butylene glycol, and polyols such as glycerin, polyglycerin, and sorbitol. These solvents are preferably added in such an amount that the concentration in the acidic detergent composition of the present invention is 0.001 to 5% by mass, and an amount that is 0.005 to 1% by mass is added. More preferred.

  Examples of thickeners include cellulose polymers (such as carboxymethyl cellulose), sodium polyacrylate, polyvinyl alcohol, carboxyvinyl polymers, xanthan gum from plant mucus, natural gums such as guar gum, alginate, starch, Examples thereof include polysaccharide-based thickeners and hydrocolloid thickeners such as pectin. The thickener is preferably added in an amount such that the concentration in the acidic detergent composition of the present invention is 0.05 to 4% by mass, more preferably 0.1 to 2% by mass. Preferably, an amount of 0.2 to 1% by mass is added.

  Examples of the fragrances include natural fragrances, synthetic fragrances, and blended fragrances thereof. Examples of the dye include natural dyes, synthetic dyes, and mixtures thereof.

  Examples of the preservative include thiazolines, hydantoins, iodo-2-propynylbutyl carbamate, isopropylmethylphenol, hexachlorophene, irgasan, triclosan and the like. Thiazolines include 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, isothiazoline-3-one, 1,2-benzisothiazolin-3-one, Nn-butyl-benzisothiazolin-3-one and the like. Hydantoins include 1,3-dimethylol-5,5-dimethylhydantoin, 1 or 3-monomethylol-5,5-dimethylhydantoin, dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, 1, Examples include 3-dichloroethylmethylhydantoin. Among these acidic detergents, more preferred are 1,2-benzisothiazolin-3-one and isopropylmethylphenol. These may be used alone or in combination of two or more.

  In the acidic CIP cleaning composition of the present invention, the total proportion of evaporation residues in the composition is preferably 40 to 80% by mass, and more preferably 42 to 65% by mass. The evaporation residue is a residue remaining after evaporation components such as water contained in the cleaning composition are evaporated, and the ratio of the evaporation residue is defined in JIS K 0102 (2008). The method is as follows.

Method for measuring evaporation residue in cleaning composition After heating the evaporating dish in a dryer at 105 ° C for 1 hour, cooling it in a desiccator containing silica gel (blue) and measuring the mass, the mass of the evaporating dish Repeat until the weight becomes constant, and calculate “mass of evaporating dish”.
Place the sample of the detergent composition in the evaporating dish that has been weighed, measure the “mass of the sample and the evaporating dish before heating”, and then heat in a dryer at 105 ° C. for 2 hours, in a desiccator containing silica gel (blue) The operation of measuring the mass by allowing to cool is repeated until the mass becomes constant, and “the mass of the sample after heating and the evaporating dish” is obtained, and the ratio of the evaporation residue is obtained from the following equation.

(Equation 1)
Percentage of evaporation residue =
{(Mass of sample and evaporating dish before heating) − (mass of sample and evaporating dish after heating)}
÷ {(mass of sample before heating and evaporating dish) − (mass of evaporating dish)} × 100

  The cleaning composition for acidic CIP of the present invention can be used on any hard surface such as glass, plastic, metal and the like, and as a specific cleaning place, CIP cleaning to factory equipment etc. Used in the acidic cleaning step of (fixed cleaning). When using the acidic CIP cleaning composition of the present invention, it is diluted so that the concentration of the component (A) is 0.01 to 5% by mass according to the type of equipment to be CIP cleaned and the degree of dirt. Although used, the component concentration (A) is more preferably 0.03 to 3% by mass, and further preferably 0.05 to 1% by mass. Although water or hot water is used for dilution, it is preferably used as an aqueous solution at 60 to 80 ° C. in the acidic washing step.

  In CIP cleaning, an object to be cleaned is usually combined with a process of rinsing with water, alkali cleaning, acid cleaning, sterilization, and the like. The acidic detergent composition of the present invention is used in an acid cleaning step in CIP cleaning. The CIP cleaning method of the present invention is used in the acid cleaning step as an aqueous solution diluted so that the concentration of the component (A) is 0.01 to 5% by mass. Each step of 1) rinsing with water, 2) alkaline cleaning, 3) rinsing with water, 4) acid cleaning, 5) rinsing with water is performed between steps 1) to 5). This is a method of performing cleaning sequentially. The other is that the steps of 1) rinsing with water, 2) acid cleaning, 3) rinsing with water, 4) alkali cleaning, and 5) rinsing with water are 1) to 5). In this method, cleaning is performed sequentially without performing a drying process between the steps. The alkali cleaning step, acid cleaning step, and sterilization cleaning step in CIP cleaning are performed for 10 to 60 minutes, generally 20 to 40 minutes, depending on the quality and amount of dirt. The CIP cleaning method of the present invention is characterized in that a drying process is not performed between each step in the CIP cleaning process. If the drying process is performed before each process is completed, the cleaned dirt is put on the equipment or the like. It will adhere and remain. In the method of the present invention, 5) After the rinsing with water is completed, no dirt adheres or remains even after drying. In the method of the present invention, 5) After rinsing with water, various treatments such as sterilization treatment, sodium hypochlorite treatment, peracetic acid treatment, iodine treatment, and hot water treatment may be performed as necessary.

Hereinafter, the present invention will be described in more detail with reference to examples.
Examples 1-18, Comparative Examples 1-19
Acidic CIP cleaning compositions having the formulations shown in Tables 1 to 4 were prepared. Each of the acidic CIP cleaning compositions was tested for scale cleaning properties, stability, metal corrosivity, and rubber packing compatibility. A result is combined with Tables 1-4 and shown.

* 1: Scale detergency test In a 200 mL beaker, 100 mL of an aqueous solution obtained by diluting the test acid CIP cleaning composition to a predetermined concentration shown in the table was prepared, and 0.4 g of calcium phosphate was added thereto and stirred for 20 minutes. .
The better the solubility of calcium phosphate, the better the scale solubility, and the scale washability was evaluated according to the following criteria, and the evaluations of Δ, ○, and ◎ were determined to be practical in scale washability.
Scale cleaning property evaluation standard (double-circle): It melt | dissolved 60% or more.
A: 40% or more and less than 60% dissolved.
Δ: 20% or more and less than 40% dissolved.
X: Dissolved less than 20%.

* 2: Stability test 200 mL of each acidic CIP cleaning composition for test was placed in a polyethylene container with a cap with a capacity of 250 mL and allowed to stand for 30 days in each incubator set at -5 ° C, 25 ° C, and 40 ° C After placing, it was visually confirmed that a uniform solution was obtained. The presence or absence of separation and precipitation of precipitates was confirmed visually, and the stability was evaluated according to the following criteria. Those evaluated as ○ were judged to be practical in stability.
Stability evaluation criteria:
○: It is a transparent solution, and neither separation nor deposit is observed. ×: Separation and precipitation of precipitates are observed at any one or more of −5 ° C., 25 ° C., and 40 ° C. among the set temperatures.

* 3: Rubber packing compatibility test 50 mL of a 10% by weight aqueous solution of each test acidic CIP cleaning composition was placed in a 100 mL polyethylene container with a cap, and an EPDM rubber panel (manufactured by Irumagawa Rubber Co., Ltd. X width x thickness = 50 mm x 25 mm x 2 mm (volume 2500 cubic millimeters)) or NBR rubber panel (Irimagawa Rubber Co., Ltd., vertical x width x thickness = 50 mm x 25 mm x 2 mm) is put so that the whole is immersed, and is capped . After raising the temperature to 80 ° C., the same temperature was maintained and the mixture was allowed to stand for 24 hours, and then the rubber panel was taken out and washed with running water. Appearance change after drying at 105 ° C. for 3 hours was judged visually, and those evaluated as Δ and ○ were judged as practical.
Rubber packing compatibility evaluation criteria:
○: No change in appearance such as curing, cracking, or expansion.
Δ: Appearance changes such as hardening, cracking, and expansion are slightly seen, but can be used.
X: Appearance changes such as curing, cracking, and expansion are observed.

* 4: Metal Corrosion Test 80 mL of a 10% by weight aqueous solution of each test acidic CIP cleaning composition is placed in a 100 mL plastic bottle with a cap, and SUS304 panel or SUS316 panel is placed in this plastic bottle so that about half is immersed. Cap it. After raising the temperature to 80 ° C. and keeping the same temperature for 24 hours, taking out the SUS panel and washing it with running water, the SUS panel immersed in the aqueous solution, the boundary between the aqueous solution and air The presence or absence of corrosion in the waterline portion and the gas phase portion exposed in the air was visually confirmed, and metal corrosivity was evaluated according to the following criteria. Those evaluated as Δ and ○ were determined to be practical.
Metal corrosivity evaluation criteria:
○: No change is observed in any of the immersion part, the water line part and the gas phase part.
Δ: Some corrosion is observed in any of the immersion part, the water line part, and the gas phase part, but it can be used.
X: Corrosion is observed in any of the immersion part, the water line part, the gas phase part or two or more places.

Examples 19-20, Comparative Examples 20-21
There are two types: stainless steel panel (5cm x 8cm) coated with oolong tea and dried at 130 ° C for 10 minutes, and stainless steel panel (5cm x 8cm) coated with milk coffee and dried at 130 ° C for 10 minutes Each step of CIP cleaning was performed under the following conditions, and a CIP cleaning test was performed.

CIP cleaning process conditions a) Rinse cleaning: 10 minutes with normal temperature water.
b) Alkaline washing: Washed at 75 ° C. for 20 minutes with a 3.0 wt% aqueous solution of Adeka Cycle CR (ADEKA Clean Aid Co., Ltd.).
c) Acid cleaning: Washed at 75 ° C. for 20 minutes with a 3.0% by weight aqueous solution of the acidic CIP cleaning composition of Example 2 d) Drying: dried with hot air at 80 ° C. for 30 minutes.

CIP cleaning was performed by combining the steps a) to d) by any one of the following methods 1) to 4). Table 5 shows the cleaning methods employed.
1) CIP cleaning method A: a) rinsing cleaning, b) alkali cleaning, a) rinsing cleaning, c) acid cleaning, a) rinsing cleaning 2) CIP cleaning method B: a) rinsing cleaning, c) acid cleaning, a) Rinse washing, b) Alkaline washing, a) Rinsing washing 3) CIP washing method C: a) Rinsing washing, b) Alkaline washing, d) Drying, c) Acid washing, a) Rinsing washing 4) CIP washing method D: a ) Rinse washing, c) Acid washing, d) Drying, b) Alkaline washing, a) Rinsing washing

  The test panel surface after cleaning was compared with that before cleaning, and the cleaning performance in CIP cleaning was evaluated. The results are shown in Table 5.

* 5: Detergency evaluation criteria in CIP cleaning ○: No residue remains.
Δ: Slight residual residue was observed.
X: Residual residue was confirmed.
As a result, it was determined that the evaluation standard is practical.

Claims (6)

  (A) Methanesulfonic acid, and (B) citric acid, and (A) for 1 part by mass, 0.01 to 0.4 parts by mass of (B) are contained. Cleaning composition.   Furthermore, (C) phosphoric acid and / or organic phosphonic acid are contained, The cleaning composition for acidic CIP of Claim 1 characterized by the above-mentioned.   Furthermore, (D) the nonionic surfactant is contained, The cleaning composition for acidic CIP as described in any one of Claim 1 or 2 characterized by the above-mentioned.   The cleaning composition for acidic CIP according to any one of claims 1 to 3, wherein a total ratio of evaporation residues in the composition is 40 to 80% by mass.   The acidic CIP cleaning composition according to any one of claims 1 to 4 is used in the acid cleaning step as an aqueous solution diluted so that the concentration of the component (A) is 0.01 to 5% by mass. 1) Rinse washing with water, 2) Alkaline washing, 3) Rinsing washing with water, 4) Acid washing, 5) Rinsing washing with water, steps 1) to 5) A CIP cleaning method, wherein cleaning is performed sequentially without performing a drying process.   The acidic CIP cleaning composition according to any one of claims 1 to 4 is used in the acid cleaning step as an aqueous solution diluted so that the concentration of the component (A) is 0.01 to 5% by mass. 1) Rinse washing with water, 2) Acid washing, 3) Rinsing washing with water, 4) Alkaline washing, 5) Rinsing washing with water, steps 1) to 5) A CIP cleaning method, wherein cleaning is performed sequentially without performing a drying process.