Citric acid (CA), also known as citric acid, is an important organic acid.  It is a colorless crystal, odorless, has a strong sour taste, is eaisly soluble in water, and is an acidity regulator (GB2760- 2014) and food additives.
food industry
Citric acid is the most biochemically produced organic acid in the world. Citric acid and salts are one of the pillar products of the fermentation industry, mainly used in the food industry, such as sour agents, solubilizers, buffers, antioxidants, Deodorizing agent, flavor enhancer, gelling agent, toner, etc.
In terms of food additives, it is mainly used in refreshing beverages such as carbonated beverages, fruit juice beverages, and lactic acid beverages, and pickled products, and its demand varies with seasonal climate changes. Citric acid accounts for about 2/3 of the total consumption of sour agents. Adding citric acid to canned fruit can maintain or improve the flavor of the fruit, increase the acidity (reduce the pH value) of some fruits with low acidity when stored in cans, weaken the heat resistance of microorganisms and inhibit their growth, and prevent low acidity. Bacterial expansion and damage often occur in canned fruit. Adding citric acid to the candy as a sour agent is easy to harmonize with the fruity taste. The use of citric acid in gel food such as jam and jelly can effectively reduce the negative charge of pectin, so that the hydrogen bonds between pectin molecules can be gelled. When processing canned vegetables, some vegetables are alkaline, and using citric acid as a pH regulator can not only play a seasoning role, but also maintain its quality. Citric acid has the characteristics of chelation and pH adjustment, so that it can increase the performance of antioxidant, inhibit enzyme activity and prolong the shelf life of food in the processing of quick-frozen food.

II. Metal Cleaning
Citric acid is an organic acid produced through microbial fermentation. It is widely used in detergent production. Its specificity and chelation effect play a positive role. In the actual use process, citric acid has good performance, mainly in terms of safety. The raw materials for preparing citric acid are all derived from grains, which are safe food-grade microorganisms. The use of citric acid will not have any impact on the environment. It is relatively easy to degrade under the action of microorganisms and heat. Its own chelating ability is also relatively strong. Mainly in time, citrate has relatively strong chelation of manganese ions and iron ions. The ability and usage effect are also outstanding. Citric acid in detergents also has outstanding corrosion inhibition properties. Pickling is an important link in chemical cleaning. Compared with inorganic acids, citric acid is relatively weak in acidity, so it is harmful to the equipment. The corrosiveness produced is also relatively small, citric acid cleaning is relatively safe and reliable, the waste liquid is relatively easy to handle, and will not cause harm to the human body.
acid is mainly used to remove rust, so it is mainly used to clean newly built boilers. Citric acid is mixed with sulfamic acid, glycolic acid or formic acid and can be used to clean calcium, magnesium scale and rust in boilers. Citric acid and ethylene glycol can Aminetetraacetic acid (EDTA) is mixed and can be used to clean the superheater.
Citric acid and its derivatives have broad uses in many fields such as chemical cleaning due to their special physical and chemical properties.
(2) Citric acid pipe cleaning