Method for preparing disodium hydrogen phosphate from glyphosate mother liquor by using ECO technology
A glyphosate mother liquor, disodium hydrogen phosphate technology, applied in chemical instruments and methods, phosphorus compounds, water treatment parameter control and other directions, can solve problems such as difficulty in recycling phosphorus and salt resources
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Embodiment 1
[0019] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:
[0020] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 90°C in the early stage, the temperature in the final stage is controlled at 85°C, and the vacuum degree is controlled at -0.08MPa;
[0021] (2) When the volume of the glyphosate mother liquor is concentrated to 30% of the original volume, all the materials are transferred to a crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 0° C. for 1 h;
[0022] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;
[0023] (4) After mixing the liquid material in step 3 and the evaporated raffinate in step 1, t...
Embodiment 2
[0027] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:
[0028] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 95°C in the early stage, the temperature in the final stage is controlled at 90°C, and the vacuum degree is controlled at -0.08MPa;
[0029] (2) When the volume of the glyphosate mother liquor is concentrated to 35% of the original volume, all the materials are transferred to a crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 5° C. for 2 hours;
[0030] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;
[0031] (4) After mixing the liquid material in step 3 and the evaporated raffinate in step ...
Embodiment 3
[0035] The invention provides a kind of method utilizing ECO method to prepare disodium hydrogen phosphate from glyphosate mother liquor, comprises the following steps:
[0036] (1) After the pH of the glyphosate mother liquor is adjusted, it enters the MVR evaporator, the temperature is controlled at 100°C in the early stage, the temperature in the final stage is controlled at 95°C, and the vacuum degree is controlled at -0.08MPa;
[0037] (2) When the volume of the glyphosate mother liquor is concentrated to 40% of the original volume, all the materials are transferred to the crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled to be 10° C. for 3 hours;
[0038] (3) Carry out solid-liquid separation after material crystallization, isolate crude sodium chloride, use as industrial salt after being purified by salt washing equipment;
[0039] (4) After mixing the liquid material in step 3 and the evaporated raffinate in s...
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