Processing method for starchiness materials and application of processing method in citric acid preparing industry

A technology for starchy raw materials and processing methods, applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems that restrict the application of citric acid wastewater reflux process, unfavorable fermentation and citric acid purification, and cannot meet high temperature amylase. and other problems, to achieve the effect of shortening the liquefaction residence time, shortening the seed cultivation cycle, and shortening the raw material processing time.

Inactive Publication Date: 2016-05-11
JIANGSU GUOXIN UNION ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process has the following defects: (1) The liquefaction process of adding enzyme twice and spraying at high temperature for the second time takes a long time for raw material processing, and the flow of process equipment is long, which significantly increases energy consumption. For example, the patent of application number 201110220758. Treatment method and preparation method of citric acid", patent application number 201110271718.0 "a treatment method and application of starchy raw materials", and patent application number 201310105118.6 "a method for preparing citric acid" all disclose secondary enzyme addition The liquefaction process of secondary high-temperature spraying discloses the process means of secondary high-temperature spraying with secondary enzyme addition; (2) Multiple pH adjustments are required during the entire raw material treatment process, which increases acid-base consumption and is time-consuming and laborious. Increase the ion concentration in the liquefied liquid, which has a negative impact on subsequent fermentation and citric acid purification; (3) The high-temperature treatment of raw materials takes a long time, especially the second injection temperature is greater than 115 ° C, resulting in the loss of sugar and nitrogen in the liquefied liquid The Maillard reaction intensifies, the harmful pigments produced increase, and the color of the sugar solution deepens, which is not conducive to subsequent fermentation and citric acid purification; (4) The secondary injection temperature is high, resulting in enzyme inactivation and increasing the amount of enzyme
However, due to the low pH of citric acid wastewater, for example, the pH of the reused neutralized waste sugar water is 4.5-5.2, and the pH of the chromatographic separation residue is 2.0-3.0, resulting in the pH of the slurry after the reflux of the wastewater cannot meet the optimum temperature of high-temperature amylase. pH range, need to add more lye or lime, restricting the application of citric acid wastewater reflux process

Method used

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  • Processing method for starchiness materials and application of processing method in citric acid preparing industry
  • Processing method for starchiness materials and application of processing method in citric acid preparing industry
  • Processing method for starchiness materials and application of processing method in citric acid preparing industry

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Experimental program
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Effect test

Embodiment 1

[0035] After crushing the corn, pass through a 80-mesh sieve; the obtained corn flour is evenly mixed with the neutralized waste sugar water and condensed water, so that the concentration of the slurry reaches 20%. A large amount of acid-resistant α-high temperature amylase was added; the obtained powder slurry was first sprayed at 105°C, then cooled to 97°C by flash evaporation, and kept for 3 hours. After the iodine test turned light brown, a qualified liquefied liquid was obtained; 70% of the liquefied liquid was passed through a plate Box filter to remove filter residue to obtain sugar solution.

[0036] Seed medium preparation: mix the liquefied liquid with tap water, dilute the total sugar concentration to 8%, add corn steep liquor to make the total nitrogen 0.15%, and prepare the seed medium; heat to 121°C, keep warm for 15min, cool down to 39°C, Inoculate Aspergillus niger spores for seed culture.

[0037] Seed culture conditions: temperature 37°C, control the oxygen ...

Embodiment 2

[0041] After crushing the corn, pass it through an 80-mesh sieve; mix the obtained corn flour with tap water, neutralized waste sugar water and chromatographic residue evenly, so that the concentration of the slurry reaches 28%. Add acid-resistant α-high temperature amylase to the amount of powder added; the obtained powder slurry is first sprayed at 108°C, then flashed and cooled to 99°C, and kept for 2 hours. After the iodine test is light brown, a qualified liquefied liquid is obtained; 75% of the liquefied The liquid is filtered through a plate frame to remove the filter residue to obtain the sugar liquid.

[0042]Seed medium preparation: mix the liquefied liquid with tap water, dilute the total sugar concentration to 8.5%, without adding other, and the total nitrogen is 0.18%, and prepare the seed medium. Heat to 121°C, keep warm for 15 minutes, cool down to 39°C, insert Aspergillus niger spores for seed culture.

[0043] Seed culture conditions: temperature 37°C, contro...

Embodiment 3

[0047] After crushing the corn, pass it through a 100-mesh sieve; mix the obtained corn flour with neutralized waste sugar water and chromatographic residual liquid evenly to make the slurry concentration reach 25%, and add 30U / g corn flour under the condition of pH 4.5-4.8 Acid-resistant α-high temperature amylase was added in a large amount; the obtained slurry was sprayed at 102°C, then flashed and cooled to 97°C, and kept for 2 hours, and the qualified liquefied liquid was obtained after the iodine test turned light brown; 80% of the liquefied liquid was passed through the plate frame Remove the filter residue by filtration to obtain sugar solution.

[0048] Seed medium preparation: mix the liquefied liquid with tap water, dilute the total sugar concentration of the mixture to 10%, add ammonium nitrate to make the total nitrogen 0.3%, and prepare the seed medium; heat to 121°C, keep warm for 15min, and cool down to 39°C ℃, inoculate Aspergillus niger spores for seed cultur...

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Abstract

The invention discloses a processing method for starchiness materials. According to the processing method, citric-acid waste water is utilized as a raw material. The processing method comprises the steps of material smashing, pulp mixing, once enzyme supplementation, once spraying, flashing and solid-liquid separation; and the enzyme is selected from acid-resisting alpha- thermostable amylase. The processing method is suitable for low-pH liquefying conditions. According to the processing method, the operation is greatly simplified, the energy consumption and producing cost are reduced, the ideal protein flocculating and purifying effect is guaranteed, and the side effects caused to following fermentation and purification are reduced. When the processing method is applied to the critic acid preparing industry, the seed growing speed is obviously increased, the seed cultivating period is shortened, the fermentation index is further improved, the fermentation period is shortened, and the converting rate is improved. Thus, the processing method has important industrial application value.

Description

technical field [0001] The invention relates to a method for preparing starchy raw materials, in particular to a process adapted to the reflux of citric acid wastewater [0002] A starchy raw material processing method, and its industrial application in the production of citric acid. The invention belongs to the technical field of chemical industry and biological fermentation. Background technique [0003] Citric acid is an important organic acid, also known as citric acid. It is colorless, odorless, has a strong sour taste, and is easily soluble in water. It has a wide range of uses in industry, food industry, and cosmetic industry. At present, citric acid is mainly produced by fermentation, using corn and other starchy crops as raw materials. The processing method of starchy raw materials usually needs to go through processes such as pulverization, pulping, jet liquefaction, and solid-liquid separation. [0004] In the traditional process, after the starch raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/48C12R1/685
CPCC12P7/48
Inventor 石贵阳陈坚胡志杰李江华蒋小东金赛孙福新彭艳红王宝石王莉李由然谭风玲
Owner JIANGSU GUOXIN UNION ENERGY CO LTD
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