Dextrose Anhydrate
Related Project：100,000 TPY Injection Grade Crystalline Anhydrous Dextrose Production Line- Shandong Xiwang
1. Preparation:
The starch milk is fed into the liquefaction PH adjustment tank measurably, PH is continuously adjusted with adding of Na2CO3 solution by metering pump according to starch milk flow rate, part of the α-starch enzyme is adding to the tank at the same time.
2. Liquefaction:
Adjusted starch milk is pumped to 1st.jet cooker to have the 1st. liquefaction done with steam, the gelatinized starch solution is sent to 1st. hold the tank and then pumped to 2nd. jet cooker to have the 2nd. Liquefaction is done with steam, the hydrolysate is sent to 2nd. hold tank. The other part of the liquefaction enzyme is added to the discharge line of the tank. After the solution is pumped to a continuous plug flow reactor to complete the liquefaction. The temperature is been cooling to 60℃ before goes to the Saccharification unit.
3. Saccharification:
Adding HCl continuously to adjust the PH value according to the hydrolysate flow rate, and has the saccharification with the help of an enzyme, during the process stir it to make the saccharification goes evenly, after achieving the required DE value, the material is sent to the next unit.
4. Vacuum rotary drum filtration:
The saccharified material contains lots of protein-based insoluble impurities that difficult for filtration. It adopts a diatomite precoating vacuum drum filter to do the filtration since the filter cake on the surface of diatomite is being removed continuously to be always new which makes the filtration fast and in-depth.
5. 1st. Decolorization and Filtration:
Adding activated carbon to the saccharified material to absorb the organic impurities (mainly the soluble colored impurities), then filter the activated carbon together with the impurities filtered.
6. Ion Exchange refining:
After the filtration of soluble and insoluble impurities, there still exist some soluble inorganic impurities in the saccharified material, exist in the form of cation and anion, ion exchange aims to remove them, the cation inside the saccharified material is exchanged with the H+ of cation exchange resin, while the anion is exchanged with the OH- of anion exchange resin, then the exchanged H+ and OH- inside the saccharified material is combined to water, the inorganic impurities came to corresponding water for filtration.
Certainly, to keep the exchangeability of exchange resin, usually uses acid and alkali to regenerate the cation and anion resin respectively when the exchangeability weakened.
7. Vacuum Concentration:
The syrup after ion exchange go through a multi-effect vacuum falling film evaporator to remove part of the water, then the concentration will be increased from about 35% to 73%.
8. Cooling crystallization:
In a horizontal cooling crystallizer, the cooling speed of the material is controlled by adjusting the cooling water flow rate. The temperature`s decline leads to a decrease of glucose`s solubility, then the total amount of glucose dissolved by water falling. and dextrose unable to fully dissolved in the water that the insoluble part will be separated as crystal from the liquid.
9. 1st. Centrifugal Separation:
The well-crystallized massecuite enters into the Centrifugal machine, high purity crystalline dextrose stays in the screen basket, the dissolved glucose and a little miscellaneous sugar will be thrown out from the Centrifugal machine as glucose mother liquor.
10. Dissolving:
Dissolving the crystallized glucose to a 70% concentration solution by hot water.
11. Second Decolorization:
Add activated carbon into the glucose solution to absorb the residue organic impurities and color, then filter out the activated carbon added and its impurities absorbed by pressure filtration.
12. Vacuum Evaporation crystallization:
The syrup after 2nd. Decolorization enters into Vacuum Pan. make it keep about 60℃`s control the concentration speed by regulating of adding steam amount. The water content`s decline leads to a decrease of glucose`s solubility, so the glucose unable to fully dissolved in the water that the insoluble part will be separated as anhydrous dextrose crystal from the liquid.
13. 2nd Centrifugal Separation:
The well-crystallized massecuite enters into the Centrifugal machine, high purity crystalline dextrose stays in the screen basket, the dissolved glucose and a little miscellaneous sugar will be thrown out from the Centrifugal machine as glucose 2nd. mother liquor.
14.Drying:
The anhydrous dextrose crystal after 2nd. Centrifugal Separation is sent to a Vibrating fluidized bed dryer, it is dried to comply with the pharmacopeia standard requirement.
15. Package:
The dry anhydrous glucose crystal is fed into the specific bag for packing to the final anhydrous glucose product.