Preparation method of ethylenediaminetetraacetic acid calcium disodium salt
A technology of disodium calcium ethylenediaminetetraacetate and sodium ethylenediaminetetraacetate, which is applied in the preparation of organic compounds, chemical instruments and methods, and preparation of cyanide reactions, etc., and can solve unqualified chlorides and low yields, etc. problems, to achieve the effect of low price, high yield and mild reaction
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[0008] Embodiment one, the present invention provides a kind of preparation method of calcium disodium ethylenediaminetetraacetate, it comprises the following steps: Step 1, at first prepare solvent and calcium-containing compound, solvent is purified water, and calcium-containing compound is calcium hydroxide , add 1.5 g of calcium hydroxide to 178 g of purified water to form a mixed solution while stirring for the first time, then heat the mixed solution to 40°C for the first time, and then stir for the second time for 15 minutes after heating up Step 2, then add tetrasodium edetate 8 g to the mixed solution after stirring for the second time and stir for the third time, heat and reflux for 1.5h during the third stirring, and then reduce the temperature while it is hot Concentrate under pressure to 1 / 3 of the original volume, then cool the concentrated acid solution to room temperature, and filter; step 3, slowly add 400ml of crystallization solution to the solution filtered ...
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