Preparation method of graft copolymer crop nutrient solution containing tryptophan
A graft copolymer, tryptophan technology, applied in liquid fertilizers, fertilizer mixtures, animal carcass fertilizers, etc., can solve problems such as affecting convenience, increasing costs, etc., achieving safe and efficient use, promoting crop growth, and easy equipment investment. Effect
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Embodiment 1
[0025] 1) Add 20 times the volume of water to 50 kg of chitosan with a molecular weight of 600,000, add acid to adjust the pH value to 3.5, stir evenly, add 3 kg of liquid high-temperature amylase with an enzyme activity of 12,000 U / ml, heat the water bath to 80 ° C, and stir for 1 hour. Adjust the pH value to 7, and filter to obtain 1000L of enzymatic hydrolysis solution;
[0026] 2) Add 50kg of tryptophan, 250g of sodium bisulfite and 250g of ammonium persulfate to the enzymatic hydrolysis solution in step 1, control the reaction temperature to 70°C, the reaction time is 2.5h, cool to room temperature, take the supernatant as the reaction solution, About 950L;
[0027] 3) The reaction liquid in step 2) is subjected to nanofiltration treatment, the pore size of the nanofiltration membrane is 1000 Dalton molecular weight, and the conductivity of the permeate is lower than 3000 μs / cm, stop adding water for top washing, and collect 830 L of concentrated solution;
[0028] 4) Th...
Embodiment 2
[0032] 1) Add 25 times the volume of water to 40kg of chitosan with a molecular weight of 800,000, add acid to adjust the pH value to 4.0, stir evenly, add 2.0kg of liquid high-temperature amylase with an enzyme activity of 12,000U / ml, heat the water bath to 100°C, and stir for 1 hour , adjust the pH value to 8, and filter to obtain about 1000L of enzymolysis solution;
[0033] 2) Add 52kg of tryptophan, 182g of sodium bisulfite and 182g of ammonium persulfate to the enzymolysis solution in step 1), control the reaction temperature to 80°C, the reaction time is 3h, cool to room temperature, take the supernatant as the reaction solution, About 970L;
[0034] 3) The reaction solution in step 2) is subjected to nanofiltration treatment, the pore size of the nanofiltration membrane is 800 Dalton molecular weight, and the conductivity of the permeate is lower than 3000 μs / cm, stop adding water for top washing, and collect 780 L of concentrated solution;
[0035] 4) The concentrate...
Embodiment 3
[0039] 1) Add 30 times the volume of water to 40kg of chitosan with a molecular weight of 700,000, add acid to adjust the pH value to 5.0, stir evenly, add 3.2kg of liquid high-temperature amylase with an enzyme activity of 15,000U / ml, heat the water bath to 100°C, and stir for 1 hour , adjust the pH value to 7.5, and filter to obtain about 1200L of enzymolysis solution;
[0040] 2) Add 60kg of tryptophan, 150g of sodium bisulfite and 150g of ammonium persulfate to the enzymolysis solution in step 1), control the reaction temperature to 65°C, the reaction time is 3h, cool to room temperature, take the supernatant as the reaction solution, About 1150L;
[0041] 3) The reaction solution in step 2) is subjected to nanofiltration treatment, the pore size of the nanofiltration membrane is 900 Dalton molecular weight, and the conductivity of the permeate is lower than 3000 μs / cm, stop adding water for top washing, and collect 1030 L of concentrated solution;
[0042] 4) The concent...
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