Principle and Process of Sweet Potato Starch Production
Posted by goodwaymachine on February 19th, 2019
Sweet potato, also known as sweet potato, sweet potato, hawthorn, red glutinous rice, etc., is an excellent raw material for starch processing. The sweet potato starch production process is actually a physical separation process, which separates the cellulose, protein, inorganic salts and other substances in the raw materials from the starch. In the production process, starch is separated from the water suspension by a large amount of water, using a special amount of water, depending on the nature of the starch being insoluble in cold water and having a specific gravity greater than water.
Basic principle of cleaning
The main purpose of the cleaning is to remove the sediment from the outer skin layer of the sweet potato and wash away the epidermis of the sweet potato roots. Cleaning the fresh sweet potato or sweet potato chips as raw materials for the production of starch is the basis for ensuring the quality of starch. The cleaning is cleaner, the quality of the starch is the better. The GD-QX type sweet potato washer is structured as a horizontal cylinder, which relies on an electric motor to drive the gear to rotate the cylinder, so that the raw material is rolled up by the side cylinder, and the water is used as a medium to spray, rinse, and frustrate to remove the sediment and part of the skin.
Basic principle of disintegration
Sweet potato starch is mainly stored in the fleshy part of the root, and only a small amount is stored in the endothelium. The purpose of the disintegration is to destroy the structure of the sweet potato, so that the tiny starch granules can be smoothly separated from the roots. The starch released from the cells is called free starch. Residual in the cells inside the dregs is called bound starch.
Basic principle of screening
Sweet potato slag is a slender fiber that is larger than starch granules. The coefficient of swelling is also larger than that of starch granules, and the specific gravity is lighter than that of starch granules. The disintegrated raw slurry is treated with water as a medium, and is fully washed-pressureless percolation-extrusion followed by a multi-stage circulation process. The panning is sufficient to free the starch from the fibers. The non-pressure diafiltration allows the slurry water to pass through the screen holes and the fine slag remains on the mesh. Squeeze to further filter out the starch slurry water contained in the potato dregs.
Basic principles of purification and precipitation
The specific gravity of mud and sand is greater than that of water and greater than the specific gravity of starch granules. According to the principle of gravity separation, the use of cyclone sand removal, or the use of the trough sedimentation method, can achieve better results. The specific gravity of the yellow pulp is close to that of water and is lighter than the specific gravity of starch granules. Its shape is palm shape. The processing cycle is longer, the glue performance is greater. Sticky screen sticks to starch granules and is extremely difficult to separate. Therefore, the raw materials are required to be fresh, the process is short, and the separation is timely.
Basic principle of dehydration
The wet starch directly from the launder generally has a moisture content of about 55%. The concentrated slurries separated by the butterfly separator and the hydrocyclone are generally 20 waves, and both need to be centrifuged again to improve the drying efficiency and save energy.
It is simplified by a vacuum filter. The advantages are low speed, no noise, stable operation, good work continuity and easy operation. The true dehydration developed by GOOWAY and China Agricultural University has changed the price of the original vacuum dewatering equipment, and introduced a vacuum dewatering machine suitable for small and medium-sized starch processing.
Basic principle of drying
At present, the starch plant generally uses air drying (also called flash drying). The entire process time is completed in an instant, so the internal moisture of the starch granules is less than gelatinized and dried, so gelatinization or degradation does not occur.
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