Preparation of polypeptide superphosphate and use thereof in agriculture

[0025] Embodiment 1: the preparation of polypeptide metal chelate and polypeptide superphosphate

[0026] The production method of the used polypeptide metal chelate aqueous solution is that L-aspartic acid, L-glutamic acid, L-leucine are mixed with 1:0.2:0.2 (molar ratio) and 150 kilograms of solid materials are added to 500 liters of material condensation reactor rotated by oil circuit or electric heating. Heating at 230°C for 4 hours, cooling to obtain 120 kg of material, with an average molecular weight of 8100, adding the condensation reactant to a stainless steel reactor, adding equimolar caustic soda and raising the temperature to 80°C for 2 hours, adjusting the pH value to 10.5, and obtaining the weight Aqueous solution of polypeptide metal chelate than 30% 580 kg.

[0027] With superphosphate: the ratio of polypeptide metal chelate = 1000:0.06 by metering pump and flow meter, flow is that the feeding speed of 90 kilograms / hour (being equivalent to 75 liters / hour) th

[0034] Embodiment 2: the preparation of polypeptide metal chelate and polypeptide superphosphate

[0035] Polypeptide metal chelate is prepared by the method of embodiment 1, with superphosphate: the ratio of polypeptide metal chelate solution=1000:0.02 is metered by metering pump and flow meter, and flow is 30 kilograms / hour (being equivalent to 25 liters / Hours) of feeding speed to mix the polypeptide metal chelate solution evenly with superphosphate. Produce 45 tons / hour polypeptide superphosphate. See table (3) for the specifications of polypeptide superphosphate

[0036] Table (3) Product Quality Index

[0037] index Polypeptide superphosphate Effective phosphorus pentoxide (P 2 o 5 )content ≥15.0％ Free acid (in P 2 o 5 )content ≤5.5％ color light yellow Polypeptide metal chelate content (weight) 0.022％ Moisture ≤15.0％

[0038] Embodiment 3: the preparation of polypeptide metal chelate and polypeptide superphosphate

[0039] Polypeptide metal chelate is prepared by the method of embodiment 1, with superphosphate: the ratio of polypeptide metal chelate solution=1000:0.08 is metered by metering pump and flowmeter, and flow is 110 kilograms / hour (being equivalent to 91.7 liters / hour) Hours) of feeding speed to mix the polypeptide metal chelate solution evenly with superphosphate. Produce 45 tons / hour polypeptide superphosphate. See table (4) for the specifications of polypeptide superphosphate

[0040] Table (4) Product Quality Index

[0041] index Polypeptide superphosphate Effective phosphorus pentoxide (P 2 o 5 )content ≥15.0％ Free acid (in P 2 o 5 )content ≤5.5％ color light yellow Polypeptide metal chelate content (weight) 0.079％ Moisture ≤15.0％