Preparation method for iron sodium ethylene diamine tetraacetate
A technology of sodium ferric EDTA and EDTA, applied in the field of preparation of sodium ferric EDTA, can solve the problem that colloids are difficult to filter and wash, the reactivity of iron oxide is low, and industrial production costs are increased, etc. problems, to achieve the effect of short reaction time, high product yield and improved crop quality
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Embodiment 1
[0017] Weigh 3.71kg of ferrous sulfate heptahydrate and add it to 8L of deionized water, heat to 40°C-50°C, stir to dissolve, then weigh 2.11kg of ammonium bicarbonate and slowly add it to the ferrous sulfate solution while stirring, and wait for the reaction Filter the reaction solution until no bubbles emerge, wash the filter cake with deionized water for 2-3 times until there is no sulfate ion, quickly air-dry and crush the filter cake to obtain the high-activity ferric hydroxide reaction raw material, and collect the ferric hydroxide The rate is above 98%.
[0018] Add 10L of deionized water to a 20L reaction kettle, slowly add 3.12kg of ethylenediaminetetraacetic acid and 0.43kg of sodium hydroxide into it, continue to add 1.37kg of the above-mentioned ferric hydroxide raw material under stirring, and use sodium hydroxide Adjust the pH to 6.0, heat to 80°C, and react for 30 minutes. The reaction solution is filtered, evaporated, concentrated, cooled and crystallized, and ...
Embodiment 2
[0020] Weigh 4.38kg of ferrous sulfate heptahydrate and add it to 9L of deionized water, heat to 40°C-50°C, stir to dissolve, then weigh 1.31kg of sodium carbonate and slowly add it to the ferrous sulfate solution under stirring, until no reaction occurs Filter the reaction solution until bubbles emerge, wash the filter cake with deionized water for 2-3 times until there are no sulfate ions, quickly air-dry and crush the filter cake to obtain the high-activity ferric hydroxide reaction raw material, and the yield of ferric hydroxide is It is more than 98%.
[0021] Add 10L of deionized water to a 20L reaction kettle, slowly add 4.10kg of ethylenediaminetetraacetic acid and 0.56kg of sodium hydroxide into it, continue to add 1.65kg of the above-mentioned ferric hydroxide raw material under stirring, and use sodium hydroxide Adjust the pH to 5.5, heat to 70°C, and react for 50 minutes. The reaction solution is filtered, evaporated, concentrated, cooled and crystallized, and the ...
Embodiment 3
[0023] Weigh 3.71kg of ferrous sulfate heptahydrate and add it to 9.6L of deionized water, heat to 40°C-50°C, stir to dissolve, then weigh 1.06kg of ammonium bicarbonate and 0.55kg of sodium carbonate and slowly add it to the sulfurous acid In the iron solution, filter the reaction solution until no bubbles emerge from the reaction, wash the filter cake 2-3 times with deionized water until there is no sulfate ion, quickly air-dry the filter cake and crush it to obtain a high-activity ferric hydroxide reaction Raw material, ferric hydroxide yield is more than 98%.
[0024] Add 10L of deionized water to a 20L reactor, slowly add 3.82kg of ethylenediaminetetraacetic acid and 0.52kg of sodium hydroxide into it, continue to add 1.40kg of the above-mentioned ferric hydroxide under stirring, and adjust the pH to 5.0, Heating to 60°C, reacting for 50 minutes, filtering the reaction solution, evaporating and concentrating, cooling and crystallizing, and crushing the crystals to obtain ...
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