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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.


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 . A part of the liquefied material is sent to be raw material to make malt syrup, The temperature is been cooling to 70℃ before the other part goes to the next unit.

3.Vacuum rotary drum filtration

The liquefied maltodextrin 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.

4.Decolorization and Filtration

Adding activated carbon to the maltodextrin liquor to absorb the organic impurities (mainly the soluble colored impurities),

then filter the activated carbon together with the impurities filtered.

5.Ion Exchange refining

After the filtration of soluble and insoluble impurities, there still exist some insoluble 

inorganic impurities in the maltiodextrin liquor ,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.

6.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 60%.

7.Spray Drying

Maltodextrin crystal after vacuum concentration is sent for spray drying through  plunger pump to get Powdered solid maltodextrin.


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