Edta-2na is a white crystalline powder with CAS No. 6381-92-6. Its molecular formula is c10h14n2o8na2 · 2H2O. It is odorless, tasteless, soluble in water, and extremely insoluble in ethanol. EDTA, as the most important chelating agent in industry, can be used as heavy metal detoxification agent, complexing agent, antioxidant synergist, stabilizer and softener; calcium, magnesium, metal masking agent and other metal reagents. EDTA disodium is an important complexing agent, which is used for complexing metal ions and separating metal ions. It is commonly used in daily chemical and cleaning. How much do you know about the synthesis of edta-2na? In the following, a synthetic method of edta-2na is introduced.

Firstly, the mixture of sodium cyanide and formaldehyde was slowly added into ethylenediamine aqueous solution according to a certain proportion, and air was introduced under 85 ℃ and reduced pressure to remove ammonia. After separation, pH value of the finished product is 4. After concentration, filtration, drying, and recrystallization.

Chloroacetic acid method: mix 100kg chloroacetic acid, 100kg ice and 135kg 30% NaOH solution, add 18kg 83% ～ 84% ethylenediamine under stirring, and keep at 15 ℃ for 1H. 30% NaOH solution was slowly added in batches until the reactants were alkaline and kept at room temperature for 12 h. Heating to 90 ℃, adding activated carbon to decolorize. The pH value of the filtrate was adjusted to 4.5 with hydrochloric acid, concentrated and filtered at 90 ℃; the filtrate was cooled, crystallized, separated and washed, and dried at 70 ℃.

The reaction of EDTA and NaOH solution was used to prepare: 292g EDTA and 1.2L water were added into the 2l reaction flask with stirrer. Add 200 ml 30% sodium hydroxide solution under stirring and heat until all reactions are completed. Add 20% hydrochloric acid to neutralize to pH = 4.5, heat to 90 ℃, concentrate and filter. The filtrate crystallizes after cooling. The product was separated by suction filtration, washed with distilled water and dried at 70 ℃ to obtain disodium ethylenediaminetetraacetic acid dihydrate.

Ethylenediaminetetraacetic acid and water are added into the enamel reaction tank, sodium hydroxide solution is added under stirring, heated to all reactions, hydrochloric acid is added to pH 4.5, heated to 90 ℃, concentrated, filtered, the filtrate is cooled, crystallized, washed and dried at 70 ℃ to obtain ethylenediaminetetraacetic acid disodium.

Ethylenediamine tetraacetic acid was obtained by condensation of sodium chloroacetate with ethylenediamine, acidification and neutralization with sodium hydroxide. Dissolve the crude product in 10 times water, add equal volume ethanol to precipitate disodium salt, then filter and wash.

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