Method for preparing N-acetyl-D-glucosamine from chitin
A technology of glucosamine and chitin, applied in the field of chemical degradation, can solve the problems of increasing industrial cost, complicated process, complicated operation, etc., and achieve the effects of large economic and social benefits, simple preparation process and broad application prospect.
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Embodiment 1
[0027] like figure 1 Shown, a kind of method that chitin prepares N-acetyl-D-glucosamine comprises the following steps:
[0028] 1) Dissolving: dissolving chitin and solvent in an ultrasonic stirring tank to obtain a crude mother liquor, the solvent being a fluorinated reagent;
[0029] 2) Filtration: The crude mother liquor prepared in step 1) is continuously pumped into a microporous membrane filter by a diaphragm pump to filter to obtain a fine mother liquor;
[0030] 3) Degradation: Place the refined mother liquor and solid acid prepared in step 2) in a degradation tank for degradation to obtain a degradation liquid, and the solid acid is SO 2- 4 / MxOy type superacid;
[0031] 4) Crystallization: pump the degradation solution prepared in step 3) into the tank and ultrasonically stir the tank and add ethanol to complete the precipitation of N-acetyl-D-glucosamine;
[0032] 5) Filtration: filter the solution after crystallization in step 4) to obtain crude N-acetyl-D-glu...
Embodiment 2
[0037] like figure 1 Shown, a kind of method that chitin prepares N-acetyl-D-glucosamine comprises the following steps:
[0038] 1) Dissolving: placing chitin and a solvent in an ultrasonic stirring tank for dissolving to obtain a crude mother liquor, the solvent being an amide / lithium chloride system;
[0039] 2) Filtration: The crude mother liquor prepared in step 1) is continuously pumped into a microporous membrane filter by a diaphragm pump to filter to obtain a fine mother liquor;
[0040] 3) Degradation: Place the refined mother liquor and solid acid prepared in step 2) in a degradation tank for degradation to obtain a degradation liquid, and the solid acid is SO 2- 4 / MxOy type superacid;
[0041] 4) Crystallization: pump the degradation solution prepared in step 3) into the tank and ultrasonically stir the tank and add ethanol to complete the precipitation of N-acetyl-D-glucosamine;
[0042] 5) Filtration: filter the solution after crystallization in step 4) to ob...
Embodiment 3
[0047] like figure 1 Shown, a kind of method that chitin prepares N-acetyl-D-glucosamine comprises the following steps:
[0048] 1) Dissolving: placing chitin and a solvent in an ultrasonic stirring tank for dissolving to obtain a crude mother liquor, the solvent being an amino acid salt;
[0049] 2) Filtration: The crude mother liquor prepared in step 1) is continuously pumped into a microporous membrane filter by a diaphragm pump to filter to obtain a fine mother liquor;
[0050] 3) Degradation: placing the refined mother liquor and solid acid prepared in step 2) in a degradation tank for degradation to obtain a degradation liquid, and the solid acid is a strongly acidic cation exchange resin;
[0051] 4) Crystallization: pump the degradation solution prepared in step 3) into the tank and ultrasonically stir the tank and add ethanol to complete the precipitation of N-acetyl-D-glucosamine;
[0052] 5) Filtration: filter the solution after crystallization in step 4) to obtai...
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