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How to make starch from sweet potato ?

Date:Jul 02, 2018/ FAQ/ Chat online/ Technical support

sweet potato starch making plant

Sweet potato starch making plant

Sweet Potato  are also known by other names, including "yam" and kumara in some country. The sweet potato root is rich content in starch. About how to make starch from sweet potato, it contain the process from sweet potato cleaning to the starch drying. The sweet potato starch is mainly used for making food and for industrial production, starch processing also the main method for sweet potato deep processing to improve value. Sweet potato starch noodle is very popular in Asia country.

How to make starch from sweet potato ?

Main process in the answer for how to make starch from sweet potato comprises the steps such as sweet potato cleaning and washing , sweet potato wet milling , sweet potato juice separation, starch extraction, starch milk refining, dewatering of refined starch milk and starch drying.

sweet potato starch

Sweet potato starch

The detail description of how to make starch from sweet potato: 

1. Sweet potato cleaning:
Coarsely cleaning of sweet potatoes takes place during the transport of sweet potatoes to the scrubber by channel. In addition, before the scrubber, straw and stones separators are installed. The main cleaning is conducted in scrubber (different kinds of high specialized machines are used). The remaining stones, sludge and light wastes are removed at this step. Water used for washing is then purified and recycled back into the process.
sweet potato cleaning machine

Sweet potato cleaning machine

2. Sweet potato wet milling of sweet potato starch making

Most often to get high starch extraction rate the milling of sweet potato tubers is carried out by a rasping mill machine. The purpose of this stage is disruption of cell walls, which therefore release as much  starch as possible to extract starch from sweet potato.

3. Sweet potato juice separation of sweet potato starch making
Seperate the impurities like protein, fiber out, made by the centrifugal sieve and fine fiber sieve. This allows the recovery full-value protein from juice and reduces the onerousness of water juice as a sludge. This separation process is used to get a clean sweet potato starch slurry for the first time of how to make starch from sweet potato.
4. Starch extraction of sweet potato starch making
After separation of sweet potato juice the pulp is directed to the washing starch station, to isolate the starch. Most used are fine fiber sieve for sweet potato starch slurry further seperating to extract starch of how to make starch from sweet potato. In these machines pulp diluted with water is washed with a strong stream of water to flush out the milk starch. The mash smuggling with water is a waste product – dewatered sweet potato pulp. Starch milk is contaminated by small fiber particles and the remaining components of the sweet potato juice – that’s why it is called raw starch milk.
sweet potato starch processing machine

Sweet potato starch refining process

5. Starch milk refining:
Raw starch milk is purified in the refining process. This involves the removal of small fibers from the starch milk and then the removal of juice water and starch milk condensation. For this purpose, the screens and hydrocyclones are commonly used. Hydrocyclones due to the low output (approximately 0.3 cubic meter per hour) are connected in parallel and works as multi hydrocyclones. An important machine used for how to make starch from sweet potato. For the starch milk desanding by hydrocyclones are used. In order to prevent enzymatic darkening of potato juice the chemical refining of starch is carried out using sulfurous acid. Refined starch milk has a density of about 22° Be, which is about 38% of starch.
6. Dewatering of refined starch milk and starch drying:
It is a suspension of starch in water, which needs dewatering up to 20% of moisture. This is equivalent to the moisture content of commercial starch when stored. High temperature cannot be use in this process because of the danger of starch gelatinization which destroys granular structure. It may result in significant changes of the functional starch properties. Therefore, removal of excess water from milk shall be done only under conditions that prevent the gelatinization of starch.
sweet potato starch processing machine
DOING vacuum filter
Dewatering of refined sweet potato starch milk is carried out in two stages in the how to make starch from sweet potato. In the first stage the excess water is removed by means of a rotary vacuum filter. Secondly moist starch is dried, without starch pasting. For this purpose a flash dryer is used. In this device moist starch (with water content 36 – 40%) is floating in strong and hot air flow and then dried during 2 – 3 seconds. Then, the starch is separated from hot air in cyclones. Due to short time of high temperature drying and intensive water evaporation from the starch granules, its surface is heated only to 40 °C. Dried sweet potato starch contains about 12%~13% of water. 

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