Biological decalcification method in process for preparing chitin

A preparation process and technology of chitin, applied in the field of biological decalcification, can solve the problems of reducing the recovery value of other by-products, incomplete recycling of resources, and degradation of environmental water quality, and achieve extensive bacterial culture conditions, reduced production costs, The effect of high acid production rate and acid strength

Inactive Publication Date: 2007-05-09
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chitin production wastewater by the acid-alkali method has been treated for many years, despite the high cost, not only can not completely recycle a large amount of animal protein, pigments, oils and other resources, but also cannot achieve standard discharge, which has become a constraint to the sustainable development of the chitin industry. one of the bottlenecks
[0004] The reason is that the key point for the discharge of chitin production wastewater by the acid-alkali method is the chloride ions in the acid leaching waste liquid, because the existence of a large number of chloride ions reduces the recovery value of other by-products and hinders the subsequent biological treatment of wastewater , and because it itself cannot be biodegraded, if it is discharged into the environment, it will degrade the quality of the environmental water body, and its own existence will also increase the measured value of COD
Therefore, there are many disadvantages in using hydrochloric acid to remove calcium or minerals in chitin-containing raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Add rice starch in the liquefaction tank, make it into a slurry with a weight concentration of 25%, adjust the pH value to 5.5 with 2% citric acid or 1.5% NaOH solution, and add it in an amount of 0.5% of the weight of rice starch α-Amylase is liquefied by continuous jet liquefaction process. The liquefied material is directly input into the fermentation tank without filtration, heated to 105°C for sterilization, then rapidly cooled to 37±1°C, and inserted into Aspergillus niger after expanded cultivation, controlled The temperature is 37±1°C, the pressure is 0.1MPa, the pH value is 6.5, and the air volume is 500m 3 / h sterile wind and stirring, when the pH value in the fermentation tank is 3 to 4, add fresh shrimp and crab shells, continue to ferment until the pH value in the tank is not greater than 2.5, and end when the ash content of chitin is less than 10%. Fermentation, releasing the contents of the fermenter, and separating the solid and liquid. Th...

Embodiment 2

[0017] Embodiment two: add crushed corn and water in the liquefaction tank to make a slurry with a weight concentration of 30%, adjust the pH value to 6.5 with 3% citric acid or 2% NaOH solution, and press the crushed corn weight 0.9% of α-amylase was added, and liquefaction was carried out by cooking intermittent liquefaction process. The liquefied material was filtered and input into the fermentation tank, heated to 110°C for sterilization, cooled rapidly to 35±1°C, and inserted into the expanded culture For Aspergillus niger, the control temperature is 35±1°C, the pressure is 0.15MPa, the pH value is 7, and the air volume is 600m 3 / h sterile wind and stirring, when the pH value in the fermentation tank is 3 to 4, add dried shrimp and crab shells that have removed protein and oil, and continue to ferment until the pH value in the tank is not greater than 2.5. When the ash content is less than 10%, the fermentation is terminated, the contents of the fermenter are discharged,...

Embodiment 3

[0018] Embodiment three: add wheat starch and water in liquefaction tank, be made into the slurry that weight concentration is 20%, adjust pH value to be 6 with 1.5% citric acid or 3% NaOH solution, press 0.8% of wheat starch weight A large amount of α-amylase is added, and the continuous jet liquefaction process is used for liquefaction. The liquefied material is directly input into the fermentation tank without filtration, heated to 105°C for sterilization, then rapidly cooled to 33±1°C, and then inserted into Aspergillus niger after expanded cultivation , the control temperature is 33±1℃, the pressure is 0.2MPa, the pH is 6.6, and the air volume is 400m 3 / h sterile wind and stirring, when the pH value in the fermentation tank is 3 to 4, add fresh shrimp and crab shells, continue to ferment until the pH value in the tank is not greater than 2.5, and end when the ash content of chitin is less than 10%. Fermentation, releasing the contents of the fermenter, and separating the...

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PUM

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Abstract

This invention discloses a method for biologically removing Ca during preparation pf chitin. The method comprises: mixing Aspergillus niger with one of chitin-containing material, saccharide, starch or starch-containing carbohydrate, fermenting in a container equipped with stirrer at 28-40 deg.C, 0.1-0.3 MPa and pH value of 5-7, introducing asepsis wind with a flux of 400-700 m3/h, stirring, terminating fermentation when the pH value is lower than 2.5 and the chitin content is lower than 10%, discharging, solid-liquid separating, washing the solid with water and drying to obtain chitin. The method has such advantages as no need for inorganic strong acid, no secondary pollution, low water and energy consumption, no waste liquid, little wastewater and little pollution. The obtained chitin has high quality. The method can effectively recover and utilize the byproducts, thus has a high profit.

Description

technical field [0001] The invention relates to a chitin production method, in particular to a biological decalcification method in the chitin preparation process. Background technique [0002] Due to its wide application and huge market demand, chitin and its derivatives have been industrialized. my country is a big chitin producing country, and the production enterprises are mainly distributed in the coastal areas. The main products are glucosamine, and most of them are small and medium-sized enterprises with an annual production scale of 100-1000 tons. The total annual domestic output is about 5,000 tons, which currently accounts for more than 80% of the global output. However, while the above-mentioned products are earning foreign exchange for the country's exports, they are also causing secondary pollution to the environment. As people pay more and more attention to chitin and its derivatives, the secondary pollution caused by the production of its low-end product - c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C12S3/00C12N9/26
Inventor 周湘池刘必谦刘凌徐君义刘爱平
Owner NINGBO UNIV
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