Sweet potato starch preparation process

The sweet potato is a good material for sweet potato starch preparation because it has a high starch content, but contains less protein and fat, and the starch content is 15-25%. Some unique properties of sweet potato starch are not replaceable by other starches, so they are widely used in the food industry. Meanwhile because of their good edible properties, they are more widely used in the field of starch processing industry.

The process flow is process of production of starch from sweet potato
Raw sweet potato - → hydraulic conveying - → cleaning to stone - → drum cleaning - → crushing - → separation - → sand removal - → concentrated desiccation cyclone separation - → purification and purification - → vacuum dehydration - → air drying - → package finished products.

Sweet potato starch preparation

1. sweet potato cleaning: sweet potato starch preparation requires the raw material be cleaned thoroughly. For the cleanness of raw material has an influence on the following separation and purification of sweet potato starch. Dry sieve is used for cleaning process which can effectively remove the sand, soil, weed and other debris.
2. Psweet potato washing: The washing process is carried out by paddle washing machine. sweet potato raw material is rolled along with the wall of the cylinder, and is sprayed, washed, bathed, mixed, and peeled with water as a medium in sweet potato starch preparation.

3. Crushing section: This is the most important step in sweet potato starch preparation. The rasper is a sweet potato starch making machine used to crush the sweet potato into slurry so as to release the free starch in the sweet potato cell. The extraction rate of starch is determined by this machine. DOING rasper is an advanced crushing machine which fully absorbs technology from home and abroad, and the breakage rate can reach at around 95%.

Sweet potato grating machine

4. Separating section: The grated sweet potato slurry need to be further processed to remove the impurities from starch. Centrifuge sieve is used to separating fiber and sweet potato starch. Multiple screening or countercurrent washing processes are generally adopted. It is required that after the separating and washing of sweet potato starch preparation, and the starch content of the residue should less than 35%.
5. Concentration and refining section: The function of this process is to remove insoluble protein and residual soluble protein and other impurities from the starch slurry, thereby achieving the purpose of washing, refining and concentrating the starch milk. At present, the hydrocyclone station is commonly used for washing, refining and concentrating in sweet potato starch preparation.

6 Dehydration section: Starch slurry stays in starch jar after refining in sweet potato starch preparation, and then is sent to vacuum filter for dehydrating. The wet starch water content after dehydration is 38-40%.

7. Drying and packing section: The wet starch is then conveyed into air flow flash dryer for frying. The steam pressure is controlled at 0.8 MPa. The sweet potato starch preparation requires that the moisture content of the finished starch is about 13.5% after drying. Packing and warehousing requires a sufficient number of bags, and timely packing for storage.

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