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Dextrose Anhydrate (DAH)

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1.Preparation


The starch milk is fed into 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 gelatized starch solution is sent to 1st. hold tank and then pumped to 2nd. jet cooker to have the 2nd. Liquefaction done with steam, the hydrolysate is sent to 2nd. hold tank. The other part of  liquefaction enzyme is added to the discharge line of the tank.After the solution is pumped to 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 enzyme,during the process

stir it to make the saccharification goes evenly ,after achieve 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 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 make 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 ,they exists in the form of cation and 

anion, the aim of ion exchange is 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 exchange ability of exchange resin ,it usually use acid and alkali to regenerate the cation and anion resin respectively when the exchange ability weakened.


7.Vacuum Concentration

The syrup after ion exchange go through 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 horizontal cooling crystallizer ,the cooling speed of the material controlled by adjusting the cooling water flow rate .The temperature`s decline leads to decrease of glucose`s solubility, then the total amount of glucose dissolved by water falling down. 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 stay 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 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. Decolorrization enters into Vacuum Pan. make it keep about 60℃`s control the concentration speed by regulation of adding steam amount .The water content`s decline leads to 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 stay 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 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 final anhydrous glucose product.


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