Process for the production of ethylenediamine tetraacetic acid

Details Process for the production of ethylenediamine tetraacetic acid Process for the production of ethylenediamine tetraacetic acid

C - Chemistry, Metallurgy

07

C

260/561.2, 260/5

C07C 101/26 (1980.01) C07C 121/43 (1980.01)

Patent

CA 1184933

A B S T R A C T Ethylenediamine tetraacetic acid is prepared by forming an ethylene- diamine formaldehyde adduct, cyanomethylating the adduct with hydro- cyanic acid at controlled temperatures to form ethylenediamine di- acetonitrile. This is further cyanomethylated under acid conditions with formaldehyde and hydrocyanic acid in slight excess to form the ethylenediamine tetraacetonitrile. The precipitated product, with or without isolation, is hydrolyzed to form the tetrasodium salt of the ethylenediamine tetreacetic acid in a stock solution for further processing. The process, in semi-batch processing, provides yields above about 98% and in good purity. When combined with ethylenediamine tetraacetic acid production, the process eliminates the need for cyanide waste treatment and greatly simplifies the procedures needed to protect the environment.

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