Corn starch preparation method

A technology of corn starch and corn steep liquor, applied in the field of corn starch preparation, which can solve the problems of low concentration of concentrated corn steep liquor, excessive steam consumption, and affecting the drying capacity of the dryer

Active Publication Date: 2015-05-27
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 concentration of concentrated corn steep liquor prepared in the corn steep liquor preparation process in the existing cornstarch preparation process, which causes the drying process of fiber feed in the subsequent process to affect the drying machine due to the excessive moisture brought by the addition of corn steep liquor. Due to the shortcomings of high drying capacity and high steam consumption, a corn starch preparation method that can by-produce high-concentration concentrated corn steep liquor is provided

Method used

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  • Corn starch preparation method

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preparation example Construction

[0012] The preparation method of corn starch provided by the invention comprises soaking corn kernels, concentrating the obtained corn soaking liquid, breaking the soaked corn kernels, separating the germ, and degerming the corn kernel tissue containing corn bran and endosperm Grinding, separating the fibers, separating the obtained coarse starch milk to obtain gluten water and starch milk, and washing the starch milk, wherein the method of concentrating the obtained corn steeping liquid includes evaporating the corn steeping liquid, and the evaporation The method comprises using a falling film evaporator to concentrate the corn steep liquor to 40-45% by weight, and using a scraped film evaporator to concentrate the resulting 40-45% by weight corn steep liquor to 48-52% by weight; preferably , using a falling film evaporator to concentrate the corn steep liquor to 40-42% by weight, and using a scraped film evaporator to concentrate the obtained 40-42% by weight corn steep liquo...

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) Soak

[0037] After the purified corn is metered, it is hydraulically transported to the soaking tank, and is countercurrent soaked with a sulfurous acid aqueous solution with a concentration of 0.25% by weight. There are 10 soaking tanks, and the capacity of each tank is 50 tons of the above-mentioned purified corn raw materials. Part of the soaking liquid in the soaking tank circulates itself through the pump, and a part flows in the opposite direction to the added corn, that is, the newly added corn is soaked with old acid. Long-term corn is soaked wit...

Embodiment 2

[0051] This embodiment is used to illustrate the preparation method of cornstarch provided by the present invention.

[0052] Cornstarch is prepared according to the method of Example 1, the difference is: in the evaporation process of step (3), the 50 ° C corn soaking liquid extracted from the soaking tank (about 25m3 per tank) 3 , dry matter content is 8% by weight) pumped in the fourth effect falling film evaporator in the multi-effect evaporation system (controlling the flow of corn soaking liquid is 6.2m 3 / h), at a heating temperature of 70°C and a vacuum of 0.068MPa, the corn soaking liquid is cyclically heated and evaporated to obtain a four-effect corn slurry liquid with a concentration of 10% by weight and a four-effect juice vapor at 52°C , the four-effect juice vapor is connected to the vacuum pump through the tube condenser, and the four-effect corn slurry liquid is extracted (the flow rate of the control feed liquid is 5-6m 3 / h) and preheated to 88°C and then pu...

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Abstract

The invention provides a corn starch preparation method. The method includes: soaking niblets, condensing obtained corn soak solution, smashing soaked niblets to separate germs out, grinding niblet tissues containing corn bran and endosperms after degerming to separate fibers out, separating obtained coarse starch milk to obtain gluten water and starch milk, and washing the starch milk. The concentration method of the obtained corn soak solution includes evaporation of the corn soak solution, and the evaporation method includes that a falling film evaporator is used for condensing the corn soak solution to 40-45wt%, and a scraper film evaporator is used for condensing the 40-45wt% of corn steep liquor to 48-52wt%. Using the method can obtain high-concentration corn steep liquor and avoid the problem of influences on drying capacity of a drying machine and steam consumption caused by high water content of corn steep liquor added to a subsequent fiber feed drying procedure.

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] Among them, wet milling is a common process in the current corn starch industry. It is mainly a process of crushing, degerming, fine grinding and sieving of soaked corn to separate 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 insoluble protein and soluble substances, and the concentration of the powder slurry is relatively thin, so it needs to be refined and concentrated to provide pure refined s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B30/02C08B30/04
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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