Cyanides, 370 nitrilotriacetate

Hydrogen cyanide in pure form was prepared first in 1815 by Gay-Lussac. Earher, in 1782, Scheel prepared this compound in dilute solution. The most important apphcation of hydrogen cyanide is to produce methyl methacrylate for methacrylate resins and plastics. Other products made from hydrogen cyanide include potassium cyanide, sodium cyanide, adiponitrile, methionine, cyanuric chloride, cyanogen, nitrilotriacetic acid, and several triazine pesticides. The compound also is used in small amounts for extermination of rodents. 

Hydrogen cyanide is an important building block chemical for the synthesis of a variety of industrially important chemicals, such as 2 hydroxy-4 methylthiobutyric acid, adiponitrile, nitrilotriacetic acid, lactic acid, and methyl methacrylate. The primary commercial routes to hydrogen cyanide are the reaction of methane and ammonia under aerobic (Andrussow Process) or anaerobic conditions (Degussa Process), or the separation of hydrogen cyanide as a by-product of the ammoxidation of propylene < ) The ammoxidation of methanol could represent an attractive alternate route to HCN for a number of reasons. First, on a molar basis, the price of methanol has become close to that of methane as world methanol capacity has increased. However, an accurate long term pricing picture for these two raw... 

The complexers maybe tartrate, ethylenediaminetetraacetic acid (EDTA), tetrakis(2-hydroxypropyl)ethylenediamine, nitrilotriacetic acid (NTA), or some other strong chelate. Numerous proprietary stabilizers, eg, sulfur compounds, nitrogen heterocycles, and cyanides (qv) are used (2,44). These formulated baths differ in deposition rate, ease of waste treatment, stability, bath life, copper color and ductility, operating temperature, and component concentration. Most have been developed for specific processes all deposit nearly pure copper metal. 

Aluminium, ammonia, antimony, arsenic, barium, beryllium, cadmium, carbon tetrachloride, cyanide, dichloromethane, di(2-ethylhexyl)-adipate, di(2-ethylhexyl)-phthalate, EDTA, epichlorohydrin, ethylbenzene, hexachlorobutadiene, iron, lead, manganese, mercury, molybdenum, monochlorobenzene, nickel, nitrilotriacetic acid, sodium, sulfate, tetrachloroethene, toluene, trichlorobenzenes,... 

Polyaminopolycarboxylic acids, alone or in mixtures, have been determined by measurements of the rate of reaction of cyanide with their Ni(II) complexes. As little as 10 ppb of nitrilotriacetic acid (NTA) in water was detected, and binary, ternary, and even four-component mixtures were determined. The rate-determining step was shown to be... 

As indicated, Ni forms generally weak complexes with common inorganic ligands. However, complexes of sizeable stability are formed with many organic ligands and a considerable portion of this study has been devoted to their effects on nickel-sorption reactions. Those ligands specifically studied were sulfate (804 ), citrate, nitrilotriacetate (NTA), glycine, and cyanide. Appropriate data are summarized in Table I. These data were obtained from Baes and Mesmer (14), Sillen and Martell (15, 16), and Smith and Martell (17). 

Adiponitrile Acetone cyanohydrin Sodium cyanide Methionine Cyanuric chloride Chelating agents Nitrilotriacetic acid Other... 

---