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Preparation method of corn starch

A corn starch and corn kernel technology, which is applied in the field of corn starch preparation, can solve the problem of low yield of gluten protein powder, and achieve the effects of easy handling, small size and improved yield.

Active Publication Date: 2012-09-26
COFCO GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low yield of gluten protein powder obtained by the gluten water treatment method in the cornstarch preparation method of the prior art and directly recycle the process water to the corn soaking process and germ, After the fiber washing process, the soaking effect of corn and the deterioration of product quality affect the quality of refined starch milk. It provides a method that can not only improve the yield of gluten protein powder, but also directly reuse the process water and improve the process water cycle. A method for preparing corn starch that improves the quality of refined starch milk by reusing the corn soaking effect of the corn soaking process and recycling the starch washing effect of the germ and fiber washing process

Method used

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preparation example Construction

[0012] According to the present invention, the preparation method of corn starch includes soaking corn kernels, breaking the soaked corn kernels, separating the germ, grinding the degerminated corn kernel tissue containing corn bran and endosperm, and separating Fiber, the obtained crude starch milk is separated to obtain gluten water and starch milk, and the starch milk is washed, wherein, the processing method of the gluten water includes concentrating the gluten water, and the process of concentrating the gluten water Methods include:

[0013] (1) Concentrating the gluten water once to obtain a first dense phase and a first water phase, the conditions of the first concentration make the content of protein-containing solids in the obtained first water phase less than 0.3% by weight;

[0014] (2) performing secondary concentration on the first concentrated phase to obtain a second concentrated phase and a second aqueous phase, the conditions of the secondary concentration are...

Embodiment 1

[0033] This embodiment is used to illustrate the preparation method of cornstarch provided by the present invention.

[0034] (1) Raw material pretreatment

[0035] Corn raw material (moisture content 14% by weight) is transported by the bucket elevator into the initial cleaning screen, iron remover, plane rotary cleaning screen for screening, stone removal, magnetic separation and other purification processes;

[0036] (2) Soaking

[0037] After the purified corn is measured, it is transported to the soaking system by hydraulic power, and then countercurrently soaked with a sulfurous acid aqueous solution (0.35% by mass). There are 10 soaking tanks, and 50 tons of the above-mentioned purified corn raw materials are respectively added to the 10 soaking tanks, wherein the soaking tanks are connected in series in sequence, the soaking time is 48 hours, and the soaking temperature is 50±2°C;

[0038] (3) Degermination

[0039] The soaked corn enters the wet corn storage hopper...

Embodiment 2

[0050] This embodiment is used to illustrate the preparation method of cornstarch provided by the present invention.

[0051] Prepare corn starch according to the method of embodiment 1, difference is, the processing method of described thin gluten water comprises:

[0052] (1) According to 380m 3 The total flow of / h sends dilute gluten water (concentration of protein-containing solids is 1.5% by weight) on average into two disc separators and concentrates dilute gluten water simultaneously (total volume of dilute gluten water) Feed amount is 380m 3 / h, the feeding volume of each unit is 190m 3 / h, the rotating speed of centrifugation is 3300 rev / min respectively, the temperature of centrifugation is 45 ℃), the total flow that obtains the first aqueous phase is 234m 3 / h (the content of protein-containing solids in the first aqueous phase is 0.28% by weight) and the total flow of the first dense phase is 146m 3 / h (the dense phase flow rate of each separator is 73m 3 / h)...

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Abstract

A preparation method of corn starch. The method includes the steps of: soaking niblets; crushing the soaked niblets; separating out germs; grinding niblet tissues containing corn bran and endosperm after degerming; separating out fiber; separating the obtained crude starch milk to obtain gluten water and starch milk; and washing the starch milk. A treatment method of gluten water comprises concentration of the gluten water. The concentration method of gluten water includes the steps of: (1) carrying out a first condensation on gluten water to obtain a first concentrated phase, wherein conditions of the first condensation enable an obtained first water phase to contain less than 0.3 wt% of solid containing protein; and (2) carrying out a second condensation on the first concentrated phase to obtain a second concentrated phase and a second water phase, wherein conditions of the second condensation enable the second concentrated phase to contain more than 10 wt% of solid containing protein. The second concentrated phase obtained by the method of the invention has similar or higher concentration compared with that of a concentrate obtained by a prior art; and water quality of the obtained first water phase is superior.

Description

technical field [0001] The invention relates to a preparation method of corn starch. Background technique [0002] The extraction process of starch is the process of separating the main components of corn kernels. There are two types of separation of the components of corn kernels: dry method and wet method, and the main separation operation is grinding. Therefore, there are dry grinding and wet grinding. . [0003] Wet milling is a common process in the current corn starch industry. It is mainly the process of crushing, degerming, fine grinding and sieving of soaked corn to separate the germ and fiber slag to obtain crude starch milk. After the starch is extracted through the grinding and sieving process, the obtained starch milk is still coarse starch milk, which still contains a large amount of protein-containing solids and soluble substances, and the concentration of the powder slurry is relatively thin, which needs to be refined and concentrated to provide for final pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/02C08B30/04C08B30/10
Inventor 岳国君郝小明艾咏平徐兆勇娄新建郜培鲁艳秋高占争罗虎王旭
Owner COFCO GROUP
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