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Citric acid production line
automatic grade：Semi-automatic
voltage：Customized
machinery capacity：30TPD
key machines：Fermentation cylinder
product type：Citric Acid
Products Introduction
Citric acid is a natural acid that is found in abundance in citrus fruits such as lemons, limes and oranges. It is a versatile compound with various applications in diffrernt industries.
1. Crushing: Cleaned corn is crushed and screened to yield corn flour with ≤30% under a 60-mesh screen, then stored in a tank.
2. Adjusting: Water is added to the corn flour slurry to adjust the dry solids (DS) to 28-32%. NaOH and enzymes are added to adjust the pH.
3. Liquefaction: The adjusted slurry undergoes starch gelatinization and liquefaction in the 1st jet cooker and liquefaction column.
4. Saccharification: After enzyme deactivation in the 2nd jet cooker, the slurry is cooled, enzymes are added, and saccharification occurs to achieve the desired Dextrose Equivalent (DE).
5. Filtration: A filter press removes coarse proteins from the saccharified liquid, which is sent to the next section. The filter cake is sent for drying.
6. Seed Production: A portion of the saccharified liquid is used to grow high-temperature resistant strains in a seed tank under controlled DS and pH conditions.
7. Fermentation: The filtered liquid is transferred to fermentation tanks, where sterile air is continuously fed. The fermentation ends when the glucose concentration is below 1g/L.
8. Pre-filtration: The fermentation liquid undergoes pre-filtration to remove impurities, producing thin citric acid for the first neutralization.
9. Neutralization:
1st Neutralization: CaCO₃ is added to the citric acid to form a calcium citrate precipitate (Ca₃(C₆H₅O₇)₂·4H₂O), which is filtered. The filtrate is waste water.
2nd Neutralization: The calcium citrate precipitate reacts to form calcium hydrogen citrate (CaH(C₆H₅O₇)·3H₂O), which is filtered again.
10 Acid Hydrolysis: The calcium hydrogen citrate reacts with sulfuric acid (H₂SO₄) to produce citric acid (C₆H₈O₇) and gypsum (CaSO₄). The gypsum is separated and sold.
11. Decolorization and Filtration: Activated carbon is added to the citric acid to decolorize it. The filtered liquid proceeds to ion exchange.
12. Ion Exchange: The citric acid solution undergoes ion exchange to remove cations, anions, and impurities, producing refined citric acid.
13. Evaporation: The citric acid is concentrated by evaporation to increase the dry solids (DS) content.
14. Crystallization:
Monohydrate Citric Acid Crystallization: The concentrated citric acid undergoes crystallization to produce monohydrate citric acid.
Anhydrous Citric Acid Crystallization: The concentrated citric acid is further processed to produce anhydrous citric acid.
15. Separation: The crystallized products (both monohydrate and anhydrous citric acid) are separated from the mother liquor, producing wet products for further processing.
16. Drying and Sieving: The wet products are dried and passed through a vibration sieve to obtain the final qualified citric acid products.
Applications of Citric Acid
1. Food and Beverage: Used as a flavor enhancer, preservative, and acidulant in products like soft drinks, candies, jams, and gelatin. It adds a sour taste and extends shelf life by inhibiting bacterial growth.
2. Cleaning Products: Effective in removing hard water stains, rust, and mineral deposits. Found in household cleaners, dishwasher detergents, and descaling agents for appliances like coffee machines and kettles.
3. Personal Care: Used in skincare and cosmetic products for exfoliation, skin renewal, and improving texture. Also included in shampoos and conditioners to balance pH.
4. Industrial Applications: Applied in metal cleaning, water treatment, and as a pH regulator in various chemical processes.
Product Showcase
Specifications
brand name
CWJX
dimension(l*w*h)
CUSTOMIZED
place of origin
China
Raw material
Corn
Main products
Monohydrous citric acid
Products output
30tons per day
Raw materal consumption
60tons per day
Major processing technology
Fermentation method
Products application
Food/chemical/cosmetics/construction/drinks
Package
In wooden cases or in anti-corrosive packaging
Installation
Field installation,commissioning and training service
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Inquiry
If you have any suggestions or opinions about our products, please leave a message and we will answer your questions immediately. Thanks for your support.
E-mail::sievingtech@aliyun.com
Tel:8615637377815
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