Nitrilotriacetic Acid and Salts

Disodium Arsenate Heptahydrate Disodium Ethylenebis (Dithiocarbamate) Disodium Methanearsonate Disodium Methyl Arsonate Disodium Nitrilotriacetate Distillate Flashed Feed Stocks Distillate Straight Run Disulfatozirconic Acid Dithane Sodium Arsenate Nabarn Methanearsonic Acid, Sodium Salts Medianearsonic Acid, Sodium Salts Nitrilotriacetic Acid and Salts Distillate Flashed Feed Stocks Distillate Straight Run Zirconium Sulfate Nabam... 

Nitrilotriacetic Acid and Salts Triethylene Glycol Ethoxy Triglycol Pyrogallic Acid Gallic Acid Glycerine Triethanolamine T rilsobutylaluminum T richloroethylene T richloroethylene Trichloroethylene Trimethylamine Tert-Butylamine... 

Nitrilotriacetic Acid and Salts — Fire Hazards Flash Point (deg. F) Not flammable ... 

Methanearsonic Acid, Sodium Salts Methanearsonic Acid, Sodium Salts Nitrilotriacetic Acid and Salts... 

Ethyl-Naphtha Nitrilotriacetic Acid and Salts — (i) Chemical Designations — Synonym Disodium nitrilotriacetate NTA Triglycine Trisodium... 

The most common chelants include EDTA (ethylenediaminetetraacetic acid) and its salts, NTA (nitrilotriacetic acid) and its salts, gluconic acid, sodium gluconate, sodium glucoheptonate (sodium heptonate), as well as the various phosphonates, polyphosphates, lignin sulfonates, and citric acid. 

As a chelating agent. The production of nitrilotriacetic acid and its salt is the... 

Organic chelant compounds, such as the sodium salts of ethylenedi-aminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA) are commonly used in BW deposit control treatments, often in combination with phosphates. 

Nitrilotriacetic acid (NTA) and especially its trisodium, monohydrate salt, N(CHC00Na)3,H20. NTA is primarily manufactured by Monsanto Chemical Company, Inc. and Hampshire Chemical. Anhydrous NTA has a MW of 257. It is generally supplied for incorporation into formulations as 40% NTA (42.8% NTA Na3 H20), (Hampene 150). Its chelating activity at a pH level of 11 is 156 mg CaC03 per gram of chelant. That is, 10 ppm of chelant will sequester 1.56 ppm of calcium hardness. 

Iron can be controlled with certain complexing agents, in particular glucono-5-lactone, citric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylethylene diaminetriacetic acid, hydroxyethyliminodiacetic acid, and the salts from the aforementioned compounds. These compounds must be added together with nitrogen-containing compounds such as hydroxylamine salts or hydrazine salts [486,643,1815]. 

The bis(nitrilotriacetato)zirconium(IV) ion, first detected by Intorre and Martell,1 has been obtained as a hydrated potassium salt by evaporation of a solution containing zirconium oxychloride and the potassium salt of nitrilotriacetic acid. On vacuum dehydration, the anhydrous complex is formed. 

Concerns about the effect of TPP on eutrophication have led many states, cities, and regional governments to ban the use of the compound in syndets. Such bans have caused serious problems for detergent manufacturers, however, because no entirely satisfactory substitute for TPP has yet been found. Two promising candidates are the sodium salt of nitrilotriacetic acid, 3Na, N(CH2C02)3 , or NTA and ethylenediaminetetraacetic acid (EDTA). Both of these compounds act in much the same way as TPP, that is, by sequestering metal ions. Other builders that have been incorporated into syndet formulations include sodium carbonate, synthetic zeolites, borates, and organic polymers known as polycarboxylates. 

Nitrilotriacetic acid N(CH2C02H)3 (nta) was first obtained by Heintz in 1862 from an ammon-iacal solution of monochloroacetic acid. Other products, i.e. glycolic, aminoacetic and iminodiacetic acids, were also formed. The next paper concerned with the preparation of aminopolycarboxylic acids appeared after 1930. A procedure similar to that given above, based on the treatment of ethylenediamine with monochloroacetic acid in presence of sodium hydroxide, was reported in 1935 by I.G.-Farbenindustrie.5 In a more recent version of the chloroacetic acid process, reaction (1) is carried out at 40-90 °C. For the preparation of edta, good yields of the tetrasodium salt can be obtained using appropriate conditions. The conversion to the insoluble free acid is achieved by acidification with a mineral acid. 

Several by-products are formed in these processes. They include ammonia, sodium salts ofNTA (nitrilotriacetic add), iminodiacetic add (IDA), glycolic acid and some partially substituted EDTA compounds. 

The sodium salt may be obtained by adding a dilute NaOH solution to attain pH 5.0. One of the main precautions is that the synthesis be done with dilute solutions. For example nitrilotriacetic acid (NTA) complexes have been synthesized using 0.02 M solutions and at higher dilutions in the case of heavy lanthanides [37]. Use of an excess of lanthanide oxide should be avoided since reactions of the following type may take place [38]... 

Nitrilotriacetic Acid. The trisodium salt of nitiilotriacetic acid, N(CH2COOH)3, so-called NTA, is a powerful sequestrant builder, comparable with sodium tripolyphosphate. It is therefore noted here, even though it is an organic builder. NTA has been recommended and used as a phosphate replacement in areas where phosphate is banned. However, because of adverse laboratory reports of possible teratogenic effects, NTA was withdrawn in 1970 from consumer products at the suggestion of... 

The low molecular weight sodium salts of ethylenediaminetetracetic acid (EDTA) and nitrilotriacetic acid (NTA) soluble in water, are effective in the control of scaling in steam raising equipment. The action of these additives is to form complex ions with calcium and magnesium hardness. The action of EDTA is similar to ion exchange, and may be described by the simplified equation ... 

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