JP2018115299A - CIP cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CIP cleaning method that makes it possible to reduce the effort, time, energy, and resources in the conventional CIP cleaning and also to produce a sufficient cleaning effect.SOLUTION: The method includes the step (a) in which a chlorine alkali cleaning agent solution is used to dissolve and remove organic depositions such as protein, carbohydrate in a food and drink production line, and the step (b) in which a cleaning liquid, prepared by adding a chelator to the chlorine alkali cleaning agent solution, is used to dissolve and remove inorganic depositions.SELECTED DRAWING: None

Description

  The present invention is safe by simple operation without disassembling the production equipment of milk beverages, fruit juice beverages, tea beverages, beverages such as coffee and beer, and food and beverage products such as dairy products, processed foods, and seasonings. The present invention relates to a CIP cleaning method (Cleaning in Place “fixed cleaning”).

  Conventionally, CIP cleaning has been performed to automatically and safely perform cleaning with simple operation without disassembling the production equipment for manufacturing products filled with various food and drink products in containers such as cans, bottles, and PET bottles. Yes.

  The cleaning solution and cleaning method for CIP cleaning are appropriately selected according to the beverages to be used, but include not only organic substances such as milk, drinks with yogurt, milk-containing drinks such as coffee with milk, but also a lot of inorganic substances. There was a problem that dirt was difficult to remove in production facilities for products.

  Therefore, conventional CIP cleaning methods for production facilities that handle this type of product are presented in Japanese Patent Application Laid-Open No. 2005-126567 (Patent Document 1), Japanese Patent Application Laid-Open No. 2010-215780 (Patent Document 2), and the like. For example, after the production of the product is completed, the inside of the line is first prewashed with water, and then the protein and carbohydrate are dissolved and removed with an alkaline detergent (sodium hydroxide aqueous solution or chlorinated alkaline detergent solution). Then, an intermediate rinse (mainly using water) is performed to prevent the first cleaning agent from being mixed into the next cleaning agent, and then an acid cleaning agent (a nitric acid aqueous solution is generally used, as well as phosphoric acid, citric acid, maleic acid) Etc. are also used as solutes), and after the inorganic deposits are dissolved and removed with an acid cleaning agent, the acid cleaning agent is generally rinsed.

  However, in the conventional CIP cleaning method, after pre-cleaning, it is necessary to perform cleaning with an alkaline cleaning agent, and then perform an intermediate rinsing and further rinsing with an acidic cleaning agent. Since there are many cleaning processes and the work is complicated and cleaning is performed using two types of cleaning agents, the cleaning time is long, and the amount of water and sewage used is also large. It is also necessary to heat the liquid to a high temperature of 60 to 80 ° C., and consumption of enormous energy such as electricity and steam has occurred.

  Further, for example, means for improving the cleaning effect of a cleaning agent by adding a surfactant, a chelating agent, an emulsifier, etc. are disclosed in JP-A-2002-105489 (Patent Document 3) and JP-T-2002-540253 (Patent Document 4). ), And Japanese translations of PCT publication No. 2004-500472 (patent document 5) etc., all of which are related to the improvement of the alkaline cleaning solution, and are intended to save labor including the subsequent acid cleaning step. Rather, it is expensive.

JP 2005-126567 A JP 2010-215780 A JP 2002-1054889 A Special Table 2002-540253 Japanese translation of PCT publication No. 2004-500472

  It is an object of the present invention to provide a CIP cleaning method capable of saving labor, time, energy, and resources in conventional CIP cleaning and obtaining a sufficient cleaning effect.

  The present invention was made to solve the above problems by dissolving and removing organic substances such as proteins and carbohydrates in food and beverage production lines with a chlorinated alkaline detergent solution (step (a)), It is characterized by dissolving and removing inorganic deposits with a cleaning liquid obtained by adding a chelating agent to a chlorine-based alkaline cleaning agent solution (step (b)).

  Moreover, in this invention, it is preferable that the said chlorine-type alkali cleaning agent solution contains 0.1 to 5 weight% of alkali and 0.01 to 0.4 weight% of effective chlorine.

  Furthermore, in the present invention, the chelating agent is preferably an aminocarboxylic acid chelating agent. Among them, ethylenediaminetetraacetate (hereinafter referred to as “EDTA”), L-glutamic acid diacetate (hereinafter referred to as “GLDA”), methylglycine Diacetate (hereinafter referred to as “MGDA”) and nitrilotriacetate (hereinafter referred to as “NTA”) are preferable.

  According to the present invention, for example, it is carried out after the alkali cleaning step performed in the CIP cleaning of the production facility of products containing a large amount of inorganic substances as well as organic substances such as milk, drinks with yogurt, and beverages with milk such as coffee with milk. By omitting the acid cleaning step, the intermediate rinsing step can be omitted and extremely efficient CIP cleaning can be performed.

The photograph before and after washing | cleaning of the test piece in a preferable Example of this invention.

  Next, a preferred embodiment of the present invention will be described.

The compounds indicated by abbreviations used in the following description are as follows.
NaOH: sodium hydroxide EDTA: ethylenediaminetetraacetate GLDA: L-glutamic acid diacetate MGDA: methylglycine diacetate NTA: nitrilotriacetate

  First, after the product production is completed, the inside of the production line is pre-washed with water or warm water (25 ° C. to 60 ° C.), and then washed with a chlorine-containing alkaline detergent solution (30 to 80 ° C.) for 10 to 30 minutes. Then, organic substances such as proteins and carbohydrates in the food and beverage production line are dissolved and removed (step (a)).

  As the chlorinated alkaline detergent solution used in the step (a) in the present invention, for example, a mixed solution of sodium hydroxide and sodium hypochlorite is used. A mixture ratio containing 0.01 to 0.4% by weight of effective chlorine is used.

  Examples of the alkali component of the chlorinated alkaline detergent used in the present invention include sodium hydroxide, potassium hydroxide, and lithium hydroxide. These may be used alone or in combination of two or more. Of these, sodium hydroxide and potassium hydroxide are preferable from the viewpoint of economy.

  Moreover, said alkali component is mix | blended in this detergent composition in 0.1-5 weight%, Preferably it is 0.1-3 weight%. If it is less than 0.1% by weight, the detergency is poor, and if it exceeds 5% by weight, the rinsing time is undesirably long.

  Further, as the chlorine-based oxidizing agent of the chlorine-based alkaline detergent used in the present invention, hypochlorites such as sodium hypochlorite and potassium hypochlorite, chlorinated isocyanurate sodium, chlorinated isocyanurate potassium Chlorinated isocyanurates such as chlorite such as sodium chlorite and potassium chlorite, chlorates such as sodium chlorate and potassium chlorate, perchlorates such as sodium perchlorate and potassium perchlorate Examples include acid salts. These may be used alone or in combination of two or more. Of these, sodium hypochlorite is preferable from the viewpoint of economy.

  Furthermore, the above-mentioned chlorine-based oxidant is blended in the present cleaning composition in an amount of 0.01 to 0.4% by weight, preferably 0.01 to 0.2% by weight, and 0.01% by weight. If it is less than%, the detergency becomes poor, and if it exceeds 0.4% by mass, the blackening of stainless steel is generated and promoted, which is not preferable. The chlorine-based oxidizer is blended for the purpose of decomposing and removing organic soils well and disinfecting and bleaching.

  The chlorine-based oxidant may further contain components usually used in the technical field. Examples of such components include silicates, phosphates, surfactants, alkali phosphonates. Examples thereof include salts and alkali polycarboxylic acid salts.

  And after the said process (a) is complete | finished, next, the detergent containing the aminocarboxylic acid type chelating agent was added to the chlorine type alkaline detergent solution used at the said process (a), and it wash | cleaned for 10 to 30 minutes. Then, the inorganic deposits are dissolved and removed (step (b)), and then rinsed with water to finish the cleaning.

  Examples of the aminocarboxylic acid chelating agent used in the present invention include ethylenediaminetetraacetic acid, nitrilotriacetic acid, glutamic acid diacetic acid, methylglycine diacetic acid, hydroxyethylenediaminetriacetic acid, diethylenetriaminopentaacetic acid, triethylenetetraaminehexaacetic acid, Examples thereof include alkali metal salts of hydroxyethyliminodiacetic acid, aspartic acid diacetic acid, ammonium salts, alkanolamine salts such as monoethanolamine, triethanolamine, and monoisopropanolamine. Among these, ethylenediaminetetraacetate, glutamic acid diacetate, methylglycine diacetate, and nitrilotriacetate are preferable from the viewpoint of detergency. These may be used alone or in combination of two or more.

  The detergent containing the aminocarboxylic acid-based chelating agent may further contain components usually used in the technical field, and examples of such components include organic acid salts, silicates, and phosphates. , Water-soluble solvents, surfactants, phosphonic acid alkali salts and polycarboxylic acid alkali salts.

  Further, the cleaning temperature of the chlorinated alkaline cleaning agent solution is preferably 30 to 80 ° C., more preferably 30 to 60 ° C. from the viewpoint of steam and electricity charges.

  Table 1-1 shows the results of the set time and actual measurement time for each process for the cleaning process in the present embodiment for the heat exchanger line, and Table 1 shows the conventional cleaning process. 2 (conventional example 1).

  In addition, the amount of water held in Embodiment 1 and Conventional Example 1 is 1,600 to 1,700 L, and the chlorine-based oxidizing agent (NaOH + chlorine + dispersant) in Embodiment 1 is 120 kg, and the additive for EDTA is 20 kg was used.

  From Table 1-1 and Table 1-2, it was confirmed that the cleaning time of Embodiment 1 was shortened by 32.6 minutes in actual measurement as compared with Conventional Example 1.

  In addition, Table 2-1 shows the results of the set time and actual measurement time for each of the cleaning steps in the present embodiment for the filler (Embodiment 2), and Table 2- shows the conventional cleaning steps. 2 (conventional example 2).

  In addition, the amount of retained water in this Embodiment 2 and Conventional Example 2 was 2,000 L, and the chlorine-based oxidizing agent (NaOH + chlorine + dispersant) in this Embodiment 2 was 160 kg, and the EDTA compounding additive was 25 kg. .

  From Table 2-1 and Table 2-2, it was confirmed that the cleaning time of the second embodiment was shortened by actual measurement by 22.7 minutes compared with the conventional example 2.

  Further, Table 3-1 shows the results of set times and actual measured times for the respective cleaning steps in the present embodiment for different fillers (Third Embodiment), and Table 3 shows the conventional cleaning steps. -2 (Conventional Example 3).

  In the third embodiment, 160 kg of the chlorine-based oxidizing agent (NaOH + chlorine + dispersant) and 20 kg of the EDTA blend additive were used.

  From Table 3-1 and Table 3-2, it was confirmed that the cleaning time of the third embodiment was shortened by 56.5 minutes in actual measurement as compared with Conventional Example 3.

Examples 1 to 5 of the present invention will be described below. In each embodiment, the test piece according to the present invention is prepared by setting a test piece that reproduces the same dirt as that in the milk coffee production facility in a CIP circulating apparatus and stirring the cleaning liquid at a speed of 7.5 m ³ / h. It implemented by the method of implementing (a) and (b) and confirming the result.

Step (a)
Washing was carried out by circulating for 5 minutes with a 50 ° C. chlorine-based alkaline detergent solution (NaOH: 0.15 wt%, sodium hypochlorite: 0.06 wt%).
Step (b)
A chelating agent (EDTA: 0.08 wt%) was added to the chlorine-based alkaline detergent solution in the step (a), washed for 5 minutes, and rinsed with water (at room temperature).

Step (a)
Washing was performed by circulating for 5 minutes in a 50 ° C. chlorine-based alkaline detergent solution (NaOH: 0.3 wt%, sodium hypochlorite: 0.01 wt%).
Step (b)
A chelating agent (EDTA: 0.08% by weight) was added to the chlorine-containing alkaline detergent solution in the step (a), washed for 5 minutes, and rinsed with water (room temperature).

Step (a)
It was circulated for 5 minutes in a 50 ° C. chlorinated alkaline detergent solution (NaOH: 0.3% by weight, sodium hypochlorite: 0.02% by weight) for washing.
Step (b)
A chelating agent (GLDA: 0.08% by weight) was added to the chlorinated alkaline detergent solution in the step (a), washed for 5 minutes, and rinsed with water (at room temperature).

Step (a)
It was circulated for 5 minutes in a 50 ° C. chlorinated alkaline detergent solution (NaOH: 0.3% by weight, sodium hypochlorite: 0.02% by weight) for washing.
Step (b)
A chelating agent (MGDA: 0.08% by weight) was added to the chlorinated alkaline detergent solution in the step (a), washed for 5 minutes, and rinsed with water (at room temperature).

Step (a)
It was circulated for 5 minutes in a 50 ° C. chlorinated alkaline detergent solution (NaOH: 0.3% by weight, sodium hypochlorite: 0.02% by weight) for washing.
Step (b)
A chelating agent (NTA: 0.08 wt%) was added to the chlorine-containing alkaline detergent solution in the step (a), washed for 5 minutes, and rinsed with water (at room temperature).

  Table 4 shows the compositions and cleaning effects of the cleaning liquids of Examples 1 to 5.

  Further, Comparative Example 1 (cleaning solution of chlorine-based alkaline cleaning agent (NaOH: 0.3% by weight, sodium hypochlorite: 0.02% by weight) at 50 ° C.) circulated for 10 minutes using a conventional cleaning solution and comparison Example 2 (cleaning solution obtained by adding a chelating agent (EDTA: 0.5% by weight) to 50 ° C. chlorine-based alkali cleaning agent (NaOH: 1% by weight)) and Comparative Example 3 (50 ° C. chlorine-based alkaline cleaning agent ( NaOH: 0.3 wt%, sodium hypochlorite: 0.01 wt%) and a chelating agent (EDTA: 0.08 wt%) added, and Comparative Example 4 (50 ° C. chlorine-based alkali cleaning) Agent (cleaning solution obtained by adding chelating agent (GLDA: 0.08 wt%) to NaOH (0.3 wt%, sodium hypochlorite: 0.02 wt%)), and Comparative Example 5 (chlorine system at 50 ° C. Alkaline detergent (NaOH: 0. Wt%, sodium hypochlorite: 0.02% by weight) to a chelating agent (MGDA: shown in Table 5 together with 0.08 wt%) the washing solution was added). In addition, the cleaning liquid of the comparative example is a result of mixing all components from the beginning and performing circulation cleaning for 10 minutes.

In addition, the evaluation which the symbol of the evaluation criteria of the cleaning property in Table 4 and Table 5 shows is as follows.
◯: Cleaning rate 90-100%
Δ: Cleaning rate 60 to less than 90% ×: Cleaning rate less than 60%

Moreover, the evaluation shown by the symbols in the evaluation criteria for residual inorganic dirt in Tables 4 and 5 is as follows.
◯: Ca less than 5 ppm Δ: Ca less than 5-10 ppm ×: Ca 10 ppm or more

  FIG. 1 shows photographs of the test piece before and after cleaning in Example 1. As a result, it was confirmed that the inorganic soil was completely cleaned.

  As described above, according to the present invention, the cleaning time is reduced by approximately 20 to 40% compared to the conventional example, and accordingly, expenses such as water and sewage charges, steam generation charges, and electricity charges can be reduced. is there.

The present invention not only seeks to save labor, time, energy, and resources in conventional CIP cleaning, but also a sufficient cleaning effect when removing dirt from a production line for foods and beverages containing organic substances and inorganic substances such as proteins and carbohydrates. It is an object of the present invention to provide a CIP cleaning method capable of obtaining the above.

Claims (4)

A CIP cleaning method comprising removing stains from a food / beverage product production line by sequentially performing the following steps (a) and (b).
(A) A step of dissolving and removing organic substances such as proteins and carbohydrates with a chlorinated alkaline detergent solution.
(B) A step of dissolving and removing inorganic deposits by adding a cleaning agent containing a chelating agent to the chlorine-based alkaline cleaning solution in the step (a).   2. The CIP cleaning method according to claim 1, wherein the chlorine-based alkali cleaning solution contains 0.1 to 5% by weight of alkali and 0.01 to 0.4% by weight of effective chlorine.   3. The CIP cleaning method according to claim 1, wherein the chelating agent is an aminocarboxylic acid chelating agent.   4. The CIP cleaning method according to claim 3, wherein the aminocarboxylic acid chelating agent is at least one of ethylenediaminetetraacetate, L-glutamic acid diacetate, methylglycine diacetate or nitrilotriacetate.