Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1985-01-31
1985-12-24
Brust, Joseph Paul
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2604655R, C07C12000, C07C12143
Patent
active
045605165
ABSTRACT:
Ethylenediamine tetraacetonitrile is prepared in a two stage process by cyanomethylating an ethylenediamine formaldehyde adduct with hydrocyanic acid at 30.degree. C. or less under basic conditions (pH 8 to 10) to form, in a first discrete stage, ethylenediamine diacetonitrile (EDDiN) which is soluble in the reaction mixture. The solution of EDDiN is then further cyanomethylated under acidic conditions with formaldehyde and hydrocyanic acid in slight excess to form ethylenediamine tetraacetonitrile (EDTN). The precipitated EDTN, with or without isolation, can be hydrolyzed to form ethylenediamine tetraacetic acid in a stock solution for further processing. The process reduces the need for toxic cyanide waste treatment and greatly simplifies the procedures needed to protect the environment.
REFERENCES:
patent: 2130505 (1938-09-01), Munz
patent: 2164781 (1939-07-01), Platz et al.
patent: 2205995 (1940-06-01), Ulrich et al.
patent: 2384813 (1945-09-01), Coleman
patent: 2407645 (1946-09-01), Bersworth
patent: 2855428 (1958-10-01), Singer et al.
patent: 3061628 (1962-10-01), Singer, Jr. et al.
patent: 3424783 (1969-01-01), Harper et al.
patent: 3463805 (1969-08-01), Morgan et al.
patent: 3515742 (1970-06-01), Morgan et al.
patent: 3644444 (1972-02-01), Popper et al.
patent: 3679729 (1972-07-01), Daniels
patent: 3714223 (1973-01-01), Godfrey et al.
patent: 3758534 (1973-09-01), Popper et al.
patent: 3907858 (1975-09-01), Davis et al.
patent: 3925448 (1975-12-01), Lanier
patent: 3959342 (1976-05-01), Homberg et al.
patent: 3988360 (1976-10-01), Gaudette et al.
Walker, "Formaldehyde", 3rd. Ed., 1975, Krieger Pub. Co., Huntington, N.Y., pp. 511-551.
Brust Joseph Paul
Ciba-Geigy Corporation
Collins Bruce M.
Roberts Edward M.
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