Equipo de fabricación de ácido cítrico automático eficiente de industrias personalizadas

Citric Acid Project Introduction

Corn dry milling: The cleaned corn goes into the miller for milling after being measured and contaminants removed. The rotary vibrating screen is then used to filter out the contaminants. After that, the storage tank receives the cleaned corn flour. 60 mesh sieve pass rate for corn flour is about ≤30%.

Slurry adjusting: To make the corn flour slurry DS=28-32%, add water. The measured corn flour slurry is delivered to the tank used to regulate the pH. With the use of a NaOH solution, adjust the PH, then add the right quantity of liquefaction enzyme.

Liquefaction: To obtain the liquefied material, send the qualified corn slurry to the first jet cooker and maintenance tank. It is then transferred to the second jet cooker and maintenance tank once the enzyme has been added. The desired DE value is then obtained by entering the liquefaction column.

Filtration: The crude protein is liquefied and then filtered through a filter press. The filtrate is routed to the following section. Crude protein can be produced by drying the filter cake.

Fermentation: The glucose was liquefied, then transported to the fermentation tank, where DS and PH were adjusted before sterilization and a cooling to 35 ° C. By continuously supplying sterile air to fermenters, seeds are added through sterilized pipes. When the remaining glucose concentration dropped to less than 1g/L, fermentation was complete.

Filtration: Two times of filtration are used. The fermented mash also has mycelium and other contaminants in addition to the final result, which is citric acid. To guarantee the purity of citric acid, contaminants are first screened. The cleansed cake mycelium was sold for use in feed production, and the filtrate was mixed with diluted citric acid and sent to the first phase of neutralization and filtration.

There are still some contaminants after the initial filtration. To make sure that the filtrate is clear and free of contaminants, a second filtration is required. The filtrate was added to the second section for neutralization and filtration after the filter cake had been cleaned with diluted citric acid.

Neutralization & filtration: Neutralization and filtration are also included twice in this section. The first is the initial filtering and neutralization. CaCO3 was added to the diluted citric acid and filtered through a belt vacuum filter to produce precipitated Ca3(C6H5O7)2•4H2O. The filtrate serves as the waste water for the wastewater treatment facility.

Next comes a second neutralization and filtering. After the second filtering and adjustment, the precipitated Ca3(C6H5O7)2•4H2O combines with the diluted citric acid to produce precipitated CaH(C6H5O7)•3H2O, which is then filtered through the belt vacuum filter. The first neutralisation portion receives the filtrate back.

Acidification: Citric acid (C6H8O7) and CaSO4 are created after adjustment when the precipitated CaH(C6H5O7)•3H2O interacts with the added H2SO4. The belt vacuum filter is used to filter CaSO4, which is subsequently sold to gypsum companies. The sections that follow are used to refine the raw citric acid.

Decolorization/filtration: Citric acid is introduced to the filtering and decolorization system. Activated carbon at the right temperature is necessary for decolorization. The filter will remove the activated carbon after it has been decolored. The subsequent stage receives the filtered citric acid.

Continuous ion exchange: To obtain the refined citric acid, the filtered citric acid enters the continuous ion exchange system where its mixed impurity ions are removed using cation and anion resin.

Evaporation: To get the appropriate DS value for the following section, the refined citric acid is concentrated in the evaporator system.

Crystallization: Citric acid that has been evaporated is added to the system of the crystallizer. Citric acid crystals that met specified criteria had been produced and were then added to the centrifugal separation section after a predetermined period of crystallization.

Centrifugal separation: After crystallization, obtain the pure citric acid crystal and mother liquid using centrifugal high-speed separation. The mother liquor is added to the process of making citric acid monohydrate.

Drying and screening: The dryer is used to produce dry goods from the wet anhydrous citric acid crystal, which is then transported to the vibrating screen to produce products that are suitable for use as anhydrous citric acid.

Citric acid monohydrate evaporation: Anhydrous citric acid centrifugation separates the mother liquor, which is then added to the evaporator system for concentration to get the desired DS value.

Citric acid monohydrate crystallization: Citric acid that has been evaporated is added to the system of the crystallizer. The certified citric acid crystal was obtained and then added to the centrifugal separation section after a predetermined amount of crystallization time.

Citric acid monohydrate separation: Obtain the pure citric acid monohydrate crystal and mother liquid following crystallization using centrifugal high-speed separation. When the quality is inadequate, the mother liquor is first returned to the citric acid monohydrate evaporator for reuse. Otherwise, it is brought to the front of the neutralization section.

Citric acid monohydrate drying and screening: Wet citric acid monohydrate crystal is transferred to the dryer to produce the dry goods, and then is sent to the vibrating screen to produce the certified citric acid monohydrate products.