Process for preparing disodium hydrogen phosphate from glyphosate mother liquor
A technology of glyphosate mother liquor and disodium hydrogen phosphate, applied in phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as high biological toxicity, high phosphorus content, and difficult treatment
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Embodiment 1
[0015] This embodiment takes the glyphosate alkaline mother liquor produced by the glycine route process as an example. For example, the water quality of glyphosate mother liquor wastewater produced by a certain factory is as follows: pH is 10.3, COD is 61000 mg / L, total phosphorus is 24200 mg / L, total nitrogen is 5300 mg / L, sodium chloride is 180 g / L, density It is 1.2 tons / cubic meter. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 260 degrees, the reaction pressure is 7.0Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the oxidation solution obtained after treatment was sampled and analyzed to obtain the following water quality parameters: pH 8.5, phosphate content 17300 mg / L, COD 21300 mg / L. C...
Embodiment 2
[0017] Adopt the glyphosate mother liquor of identical water quality with embodiment 1 in the present embodiment. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 275 degrees, the reaction pressure is 8.3Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the obtained oxidation solution was sampled and analyzed to obtain the following water quality parameters: pH 7.9, phosphate content 21200 mg / L, COD 17500 mg / L. Cool 50 tons of the oxidizing solution to 5°C, crystallize for 4 hours, and then centrifugally filter to obtain 12.2 tons of crude disodium hydrogen phosphate dodecahydrate crystals.
Embodiment 3
[0019] Adopt the glyphosate mother liquor of identical water quality with embodiment 1 in the present embodiment. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 290 degrees, the reaction pressure is 9.9 Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the following water quality parameters were obtained by sampling and analyzing the oxidation solution obtained after treatment: pH 7.7, phosphate content 22100 mg / L, COD 12500 mg / L. Cool 50 tons of the oxidizing solution to 3°C, crystallize for 4 hours, and then centrifugally filter to obtain 13.2 tons of crude disodium hydrogen phosphate dodecahydrate crystals. The oxidized solution after centrifugal filtration is concentrated by nanofiltration membr...
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