A kind of method for preparing disodium hydrogen phosphate based on glyphosate mother liquor
A glyphosate mother liquor, disodium hydrogen phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of backward product development, high content of refractory compounds, large emissions, etc., and achieve cost savings , to ensure the effect of purity
Active Publication Date: 2018-10-23
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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Problems solved by technology
But at the same time, the production of glyphosate is also accompanied by the production of a large amount of wastewater. The pollution problem of glyphosate production is mainly manifested as wastewater, which has large discharge, high pollutant concentration, high toxicity, high salt content, and refractory compounds. High content, difficult to control and other characteristics
At present, the application of pollutant treatment technology lags behind the development of products
Method used
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Embodiment
[0017] A method for preparing disodium hydrogen phosphate based on glyphosate mother liquor, said method comprising the following steps: (1) after the glyphosate mother liquor is adjusted to a pH value of 10, it enters an MVR evaporator, and the temperature is controlled at 75°C in the early stage, The final temperature is controlled at 90°C, and the vacuum degree is controlled at -0.08MPa; (2) When the concentration of the glyphosate mother liquor is 50%, all the materials are transferred to the crystallization kettle for normal pressure crystallization, and the crystallization temperature is controlled at 5°C , the time is 1h; (3) solid-liquid separation is carried out after the material is crystallized, and the crude product of sodium chloride is isolated, and the industrial salt product standard is reached after being purified by the salt washing equipment; (4) the liquid material in the step (3) and the step (1) After the evaporation raffinate is mixed, it is transferred t...
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The invention discloses a method for preparing disodium hydrogen phosphate based on a glyphosate mother solution, wherein the method comprises the following steps: (1) adjusting the pH value of the glyphosate mother solution, and then allowing the glyphosate mother solution to enter an MVR evaporator; (2) transferring the whole material into a crystallization kettle, and carrying out normal pressure crystallization; (3) after the material is crystallized, carrying out solid-liquid separation; (4) carrying out normal pressure degradation in a catalytic degradation tower; (5) extracting sodium chloride, disodium hydrogen phosphate and trisodium phosphate, cooling wastewater after degradation to room temperature through heat transfer, then transferring into an extraction tank, carrying out cooling crystallization operation, transporting an extract liquid after crystallization to a two-in-one filter press through a pump, and filtering; and (6) washing a solid after filtration with water for two times, then discharging, and packing for sale. The MVR evaporator is used for concentration, so the purity of the product can be ensured; the glyphosate wastewater is subjected to catalytic degradation by an electrocatalytic oxidation technology, sodium chloride, disodium hydrogen phosphate and trisodium phosphate are extracted to be used as by-products, and the costs are saved.
Description
technical field [0001] The invention relates to a method for preparing disodium hydrogen phosphate, in particular to a method for preparing disodium hydrogen phosphate based on glyphosate mother liquor. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, low-residue, and broad-spectrum herbicide for post-emergent herbicides. It has good systemic and conductive properties. It is one of the herbicide varieties with the largest consumption, the fastest growth momentum and the most market competitiveness in the world today. But at the same time, the production of glyphosate is also accompanied by the production of a large amount of wastewater. The pollution problem of glyphosate production is mainly manifested as wastewater, which has large discharge, high pollutant concentration, high toxicity, high salt content, and refractory compounds. High content, difficult management and other characteristics. At present, the application of pollutant treatment t...
Claims
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IPC IPC(8): C01B25/30C01D3/04
CPCC01B25/30C01D3/04
Inventor 刘心龙陈建平刘超张善义
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD