ニトリロ三酢酸 化学特性,用途語,生産方法
外観
白色～ほとんど白色粉末～結晶
解説
N,N-bis(carboxymethyl)glycine．C6H9NO6(191.14)．N(CH2COOH)3．ニトリロ三酢酸, 略称NTA．アンモニア三酢酸ともいう．アンモニアとクロロ酢酸あるいはアンモニア，ホルムアルデヒド，シアン化カリウムから得られる．白色の結晶．分解点242 ℃．pK1 1.89(COOH)，pK2 2.49(COOH)，pK3 9.73(NH＋)．水に微溶．アルカリ土類金属や遷移金属と水溶性の安定なキレート錯体をつくる．安定度はEDTAの場合より低いが，より安価で自然に分解されやすいので，硬水軟化剤，界面活性剤用添加剤，放射性汚染除去剤として使用される．森北出版「化学辞典（第2版）
用途
キレート化剤、希土類元素の精製における溶離剤、 洗剤ビルダー、硬水軟化剤、界面活性剤の添加剤、放射能汚染除去剤など. 二ナトリウム塩はキレート滴定用の試薬として使われている。
化学的特性
Nitrilotriacetic acid, also known as NTA, is a white crystalline powder. It can dissolve in ammonia and alkali solutions while being slightly soluble in hot water. However, it is insoluble in water and most organic solvents. NTA can form mono-, di-, and tribasic salts, all of which are soluble in water. Combustible. 70% biodegradable.
製造方法
The synthesis of nitrilotriacetic acid involves the following steps:
Chloroacetic acid is reacted with sodium hydroxide to produce sodium chloroacetate.
Sodium chloroacetate then reacts with ammonium chloride to form sodium aminotriacetate.
The resulting sodium aminotriacetate is acidified to obtain nitrilotriacetic acid.
一般的な説明
Odorless white solid. Sinks in and mixes with water.
空気と水の反応
Water Insoluble.
反応プロフィール
Nitrilotriacetic acid is incompatible with strong oxidizers, aluminum, copper, copper alloy and nickel. Nitrilotriacetic acid is also incompatible with strong bases.
危険性
Possible carcinogen.
健康ハザード
Toxicity and health hazard of these compounds are low. Contact with eyes causes irritation.
火災危険
Flash point data for Nitrilotriacetic acid are not available; however, Nitrilotriacetic acid is probably combustible.
安全性プロファイル
Confirmed carcinogen with experimental carcinogenic and neoplastigenic data. Poison by intraperitoneal route. Moderately toxic by ingestion. When heated to decomposition it emits toxic fumes of NOx,.
職業ばく露
Nitrilotriacetic acid (NTA) was used
as a phosphate replacement in laundry detergents in the late
1960s. In 1971, the use of NTA was discontinued. The possibility
of resumed use arose in 1980. NTA is now used in
laundry detergents in states where phosphates are banned.
NTA is also used as a boiler feed-water additive at a maximum
use level of 5 ppm of trisodium salt. Currently, the
remaining nondetergent uses of NTA are for water treatment,
textile treatment; metal plating and cleaning; and
pulp and paper processing.
発がん性
Nitrilotriacetic acid is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.
輸送方法
UN2811 Toxic solids, organic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical
Name Required.
純化方法
Crystallise it from water and dry it at 110o. [Beilstein 4 IV 2441.]
不和合性
Dust may form explosive mixture with
air. Compounds of the carboxyl group react with all
bases, both inorganic and organic (i.e., amines) releasing
substantial heat, water and a salt that may be harmful.
Incompatible with arsenic compounds (releases hydrogen
cyanide gas), diazo compounds, dithiocarbamates, isocyanates,
mercaptans, nitrides, and sulfides (releasing
heat, toxic and possibly flammable gases), thiosulfates
and dithionites (releasing hydrogen sulfate and oxides
of sulfur). Attacks aluminum, copper, copper alloy and
nickel.
廃棄物の処理
Dissolve or mix the material
with a combustible solvent and burn in a chemical
incinerator equipped with an afterburner and scrubber.
All federal, state, and local environmental regulations must
be observed.
ニトリロ三酢酸 上流と下流の製品情報
原材料
準備製品