process of industrial production of high fructose syrup
Release Time：2019-05-07 22:07Author：sd888Source：未知
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process of industrial production of high fructose syrup
In the contemporary process, corn is milled to produce corn starch and an "acid-enzyme" process is used in which the corn starch solution is acidified to begin breaking up the existing carbohydrates, and then enzymes are added to further metabolize the starch and convert glucose to fructose.
During the high fructose corn syrup production plant process, the first enzyme added is alpha-amylase which breaks the long chains down into shorter sugar chains – oligosaccharides. Glucoamylase is mixed in and converts them to glucose; the resulting solution is filtered to remove protein, then using activated carbon, and then demineralized using Ion-exchange resins. The purified solution is then run over immobilized xylose isomerase, which turns the sugars to ~50–52% glucose with some unconverted oligosaccharides, and 42% fructose (HFCS 42), and again demineralized and again purified using activated carbon. Some is processed into HFCS 90 by liquid chromatography, then mixed with HFCS 42 to form HFCS 55.
(1) Liquefaction:
Starch slurry mixed with 30-35% dry solids and adjust its PH value to 6.0-6.4. Before put into α-enzyme, first add calcium, because calcium ions can stabilize the enzyme. Then mixed heat-stable α-enzyme (Novo’s Termamyl 120L) into the starch slurry, the slurry is instantaneously heated to 100 ℃ and held at this temperature for 10 min before it is cooled to 90 ℃. This temperature is maintained for 1-3h service for further hydrolyze the starch.
This process directly decided the yield in the high fructose corn syrup production plant, also can understand this as the starch using rate.
Liquefaction process technical parameters:
-Starch slurry concentration: 32%-36%
-α-enzyme: 8-10g per ton dry starch
-PH value: before: 6.0-6.4 after: 4.2-4.5
-Temperature: different value in different section
-Liquefaction solution DE value: 15%-20%
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