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automatic cassava Maltose syrup processing machines

Release Time:2020-07-02 20:14Author:sd888Source:未知

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Technological process of cassava starch equipment
 
(1) Raw material pretreatment: After the cassava is harvested, it is usually cut into flakes or filaments, and after drying in the sun or fire, it is made into dried cassava. This kind of dried cassava is inevitably mixed with various impurities during processing and transportation, so it must be pretreated. There are two kinds of pretreatment: dry method and wet method. The dry method uses screening equipment and air separation equipment. Wet processing uses a washing machine or washing tub.
 
(2) Soaking: In order to improve the starch yield, alkali water soaking can be used. Generally, saturated lime milk or 1% dilute alkaline solution is added to the soaking water to make the pH value 10-11. The soaking time is about 12 hours, and the temperature is controlled at 35-40 degrees Celsius. After soaking, the water content of sweet potato chips is 60%.
 
(3) Crushing and grinding: The soaked cassava chips enter the hammer crusher with water to be crushed to a certain degree of fineness, and are discharged out of the machine through the sieve holes. During the crushing process, the instant temperature rises, and part of the starch is susceptible to thermal gelatinization, so that it will affect the separation of starch and potato residue when sieved; it is not easy to settle during the separation of the flow tank, resulting in increased secondary powder and affecting the production of good powder. Out rate. In order to prevent the starch from being crushed easily by one crushing process, the process of two crushing and sieving can be adopted. That is, the dried potato is crushed in the first pass, sieved, then crushed in the second pass, and then sieved. In the crushing process, in order to reduce the instantaneous temperature rise, the slurry concentration is adjusted according to the different crushing particle sizes of each pass, the first pass is 3-3.5 Baume degree, and the second pass is 2-2.5 Baume degree. At the same time, the feeder is used to control the feed of dried sweet potatoes, to balance the powder slurry, avoid the overload phenomenon of the crusher, and also facilitate the separation of the flow tank.
 
4) Screening: The sweet potato paste obtained after crushing the dried cassava is also called feed liquid, and must be screened to separate the slag, that is, the fiber. A flat shaker is usually used. The liquid material enters the screen surface and requires uniform sieving and continuous water spray. Starch enters the slurry pond with water through the screen hole, and the slag remains on the screen surface and is discharged from the screen tail. The screen cloth is 120 mesh nylon cloth. During the sieving process, because the viscous materials such as pectin in the feed liquid remain on the sieve surface, which affects the separation effect of the sieve, the sieve cloth should be washed frequently to ensure that the sieve holes are unobstructed.
 
The drying system of cassava starch equipment is composed of main drive, wire rope, chain hanging device, steel structure cooling fan, moisture exhaust fan, steam heating tube, sensor, temperature and humidity detection controller, electrical control cabinet, etc.
 
Crystalline fructose is a sweetener with medical and health care functions.It is widely used in the food industry and the pharmaceutical industry.Because of its unique sweetness, sweetness, solubility, hygroscopicity, and osmotic pressure, it is more important. Fructose has the characteristics of replacing glucose for energy and not causing fluctuations in blood glucose. Because fructose has metabolic and osmotic pressure characteristics, it can be used for the treatment of diabetes, liver disease, cardiovascular disease and brain disease, so the demand for crystallized fructose in the pharmaceutical industry has increased. In the chemical industry, fructose is an important raw material for platform compounds such as 5-hydroxymethylfurfural (5-HMF). The research on the production technology of crystalline fructose in my country is inadequate, especially the key technologies such as the separation process of fructose syrup and the crystallization process of fructose. This subject mainly focuses on these two aspects. First, 14 kinds of strong acid cation exchange resins were investigated, and resin XA 2004/22 with better adsorption capacity for fructose was selected. The adsorption ratio of fructose and glucose reached 2.32 when the temperature was 303 K. The adsorption isotherm conforms to the Linear model. The effect of 11 cations on the adsorption of fructose and glucose on the resin was investigated, and Ca2+ was the most suitable. The adsorption process conforms to the second-order adsorption kinetic equation. According to the intra-particle diffusion model, the adsorption process is mainly affected by the liquid membrane diffusion resistance and pore diffusion resistance. Secondly, the effects of fixed bed column width, injection concentration and injection flow rate on the resin XA2004/22 packed bed penetration curve were studied. The preferred conditions for the dynamic adsorption process are high influent concentration, low flow rate, and narrow fixed bed column width. The penetration curve data shows that both the Yoon-Nelson model and the Thomas model can well describe the adsorption and distribution process of fructose on the cation exchanger XA 2004/22. A method of chromatographic separation of fructose syrup was established: on the basis of column elution optimization, HFCS 50 was subjected to two consecutive chromatographic separations, and the resulting fructose liquid purity was 92.4% (w/w), and the total recovery rate was 24.3 %(w/w). Finally, by comparing the crystalline fructose obtained by different crystallization methods, the alcohol-water system (V ethanol: V water = 7.5) was used to prepare the crystalline fructose by cooling and crystallization; the solubility and super-solubility data of fructose in different solvent systems were measured by The properties of the metastable zone of the alcohol-water system were studied, and it was found that the stirring speed and seed crystals would affect the width of the metastable zone; a crystallization process for the fructose alcohol water system was established to optimize the crystallization process conditions, resulting in larger particle sizes and more crystalline forms Good fructose crystals with concentrated particle size distribution have a purity of >99% and a yield of 59.3%, but the total fructose yield is not high, and further research is needed to improve the yield.

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