Method for preparing chitosan with crude chitin as raw material
A technology of chitin and chitosan, applied in the field of aquatic product processing waste utilization, can solve the problems of low decolorization efficiency, difficult to treat wastewater, low protein removal rate, etc., and achieve the effect of fast and efficient decolorization
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Embodiment 1
[0040] In a glass flask, 10 g of crude chitin was added to 100 g of a decolorizing agent (a mixed solution containing 60% by weight of formic acid, 9% by weight of hydrogen peroxide and 31% by weight of water) and mixed at room temperature for 5 minutes to perform decolorization pretreatment . The mixture was then filtered. The resulting solid was washed and dried to obtain decolorized chitin.
[0041] Mix 7 g of decolorized chitin with 140 g of NaOH aqueous solution having a concentration of 50% by weight, heat to boiling, and heat to boil for 2 hours to carry out deacetylation reaction. The mixture was then filtered. The resulting solid was washed with water until neutral to obtain wet chitosan.
[0042] The wet chitosan was vacuum-dried at 50° C. to obtain a dry chitosan product, the color of which was pure white, and the protein impurity content was 0.6% by weight.
Embodiment 2
[0044]In a glass flask, 10 g of crude chitin was added to 100 g of a decolorizing agent (a mixed solution containing 20% by weight of formic acid, 25% by weight of hydrogen peroxide and 55% by weight of water) and mixed at room temperature for 30 minutes to perform decolorization pretreatment . The mixture was then filtered. The resulting solid was washed and dried to obtain decolorized chitin.
[0045] 8 g of the obtained decolorized chitin was mixed with 160 g of NaOH aqueous solution having a concentration of 4% by weight, and heated to 100° C. for 2 hours to perform deproteinization pretreatment. The mixture was then filtered. The resulting solid was washed with water and dried to obtain deproteinized chitin.
[0046] Mix 7 g of deproteinized chitin with 140 g of NaOH aqueous solution having a concentration of 50% by weight, heat to boiling, and heat to boil for 2 hours to carry out deacetylation reaction. The mixture was then filtered. The resulting solid was washe...
Embodiment 3
[0049] In a glass flask, 10 g of crude chitin was added to 100 g of a decolorizing agent (a mixed solution containing 40% by weight of formic acid, 16% by weight of hydrogen peroxide and 44% by weight of water) and mixed at room temperature for 10 minutes to perform decolorization pretreatment . The mixture was then filtered. The resulting solid was washed and dried to obtain decolorized chitin.
[0050] 8 g of the obtained decolorized chitin was mixed with 160 g of NaOH aqueous solution having a concentration of 10% by weight, and heated to 105° C. for 2 hours to perform deproteinization pretreatment. The mixture was then filtered. The resulting solid was washed with water and dried to obtain deproteinized chitin.
[0051] Mix 7 g of deproteinized chitin with 140 g of NaOH aqueous solution having a concentration of 50% by weight, heat to boiling, and heat to boil for 2 hours to carry out deacetylation reaction. The mixture was then filtered. The resulting solid was washe...
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