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Process for producing sweet potato starch in Shandong

Process for producing sweet potato starch in Shandong

Transport cleaning - disintegration - Screening - sediment removal - precipitation (or enrichment) - dehydration drying - Air-cooled packaging.

First, cleaning the basic principles of cleaning role: mainly to clear the surface of the sweet potato cortex with sediment, and wash away the root of sweet potato root epidermis. As the raw material for the production of starch - fresh sweet potato or dried sweet potato slices for cleaning, is to ensure the quality of starch foundation, the more clean the net, the quality of the better the starch.

Two, the basic principle of broken solution

The role of hydrolysis: sweet potato starch is mainly stored in the fleshy part of the root tuber, only a small amount stored in the endothelium. The purpose of the solution is to destroy the tissue structure of the sweet potato, so that tiny starch particles can be successfully separated from the root tuber. The starch released from the cell is called free starch; the residue in the interior of the cell is called bound starch.

Comminution is one of the most important steps in the processing of fresh potato. It is related to the flour yield and the quality of the fresh potato,

The requirement for comminution lies in:

1., as much as possible to make the fresh potato cells rupture, release more free starch granules;

2. easy to separate. Do not want to peel pomace or too small, is not conducive to starch separation and other ingredients, and increase the difficulty of separation of fine slag.

The basic principle of sweet potato residue three, sieving is slender fiber volume greater than the starch particles, expansion coefficient is larger than Peng starch granules, the proportion of light in starch granule, the breaking of the puree, with water as the medium, the potato residue containing starch further filtered water. Four, the basic principle of purification and precipitation of mud and sand is greater than the proportion of water is greater than the proportion of starch granules, according to the principle of proportion of separation, using cyclone sand, or use the chute sedimentation method can achieve the ideal effect. The yellow pulp proportion, close to water, and the ratio of starch granules in the shape of light weight, long processing cycle more hand, performance more sticky stick sieve, starch granules, and very difficult to separate, so the requirements of fresh raw materials, short process, timely separation.

Five, the basic principle of dehydration, after the concentration of starch pulp still contains more moisture, further dehydration to dry. Six, the basic principle of air drying the starch factory by drying (called flash drying) the whole process time is done in an instant, so moisture not gelatinization of starch granules has been dry, so it won't happen pasting or degradation phenomenon. The airflow drying is a concurrent drying process, that is, the concurrent process of the wet powder material and the hot gas flow. It consists of two processes, heat transfer and mass transfer. When the wet starch is in contact with the hot air, hot air heat transfer to the surface of the wet starch, transferred to the internal surface, this process is the process of heat transfer; at the same time, the wet starch in water from the material to liquid or gaseous diffusion to the surface of starch, starch by surface by gas film diffusion to heat the air to this is a mass transfer process. The heat exchange between the high temperature air flow and the wet starch can be carried out in the drying pipe evenly, so that the dried starch is powder shaped and can be packed into storage after being cooled.


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