Advantages and disadvantages of commonly used detergents in CIP cleaning systems
CIP cleaning system can guarantee a certain cleaning effect, improve product safety; save operating time, improve efficiency; save labor and ensure operation safety; save water, steam and other energy, reduce detergent dosage; production equipment can realize large-scale, automation High level; prolong the service life of production equipment. The mechanism of action of CIP cleaning The chemical energy is mainly produced by the chemical reagent added thereto, which is the main factor determining the washing effect.
Types of cleaning agents At present, there are many types of cleaning agents used in the food industry, mainly acid and alkali, among which sodium hydroxide and nitric acid are widely used. Alkali detergents have a good removal effect on high-protein-containing soils, but have a certain corrosive effect on food rubber gaskets and the like. Acid detergents have a good effect on stubborn scales that cannot be removed by alkaline cleaners, but they are corrosive to metals. Some anti-corrosion agents should be added or rinsed with water.
The cleaning agent also has a surfactant, a chelating agent, etc., but is used only when it is particularly needed. For example, when the hardness of the cleaning water is high, a chelating agent can be used to remove the metal ion. When the concentration of the cleaning agent increases the concentration of the cleaning agent, the cleaning time can be appropriately shortened or the shortage of the cleaning temperature can be compensated. Increasing the concentration of the cleaning agent will increase the cleaning cost, and the increase in concentration does not necessarily improve the cleaning effect effectively. Therefore, it is necessary for the manufacturer to determine the appropriate concentration according to the actual situation. Washing temperature Generally speaking, for every 10 °C increase in temperature, the chemical reaction rate will increase by 1.5-2.0 times, the cleaning speed will also increase accordingly, and the cleaning effect is better. The cleaning temperature is generally not lower than 60 °C. Cleaning time is affected by many factors such as detergent type, concentration, cleaning temperature, product characteristics, production line layout, and equipment design. The cleaning time must be appropriate. Too short can not effectively remove the dirt, too long is a waste of resources.
Generally, manufacturers can choose detergents according to the nature and degree of pollution of the cleaning object, the materials, water quality, selected cleaning methods, cost and safety. Commonly used detergents for CIP cleaning systems are acid, alkaline detergents and sterile detergents.
The advantages of acid and alkali detergents are: pickling can remove residues such as calcium salts and mineral oil by chemical reaction; alkali washing can remove residues such as fat and protein by saponification reaction.
Disadvantages are: strong irritating to the skin; poor water washability.
The advantages of the sterilizing agent are: rapid bactericidal effect, effective for all microorganisms; generally non-toxic after dilution; not affected by water hardness; forming a film on the surface of the device; easy to measure concentration; easy to measure;
Disadvantages are: there are special tastes; certain storage conditions are required; different concentrations of bactericidal effect are different; when the temperature is low, it is easy to freeze; improper use can cause side effects; the bactericidal effect of mixing with dirt is obviously reduced; when it is spilled, it is easy to contaminate the environment and leave traces. .
The acid in the acid-base detergent refers to a 1% to 2% nitric acid solution, and the alkali refers to 1% to 3% sodium hydroxide at 65 ° C - 80 ° C. The sterilizing agent is a chlorine-based bactericide which is frequently used, such as sodium hypochlorite. When the heat energy is at a certain flow rate, the higher the temperature, the smaller the viscosity coefficient and the larger the Reynolds number (Re). The rise of temperature can usually change the physical state of the dirt, accelerate the chemical reaction rate, increase the solubility of the dirt, and facilitate the separation of the impurity solution during cleaning, thereby improving the cleaning effect and shortening the cleaning time. The amount of exercise energy is measured by Re.
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