Адипат аммония

Identification

Ammonium adipate is the ammonium salt of adipic (hexanedioic) acid. English name Ammonium adipate, CAS number 19090-60-9, chemical formula C6H10O4,xH3N. Synonyms: hexanedioic acid (ammonium salt), adipic acid (ammonium salt), hexanedioic acid - ammonium salt.

Physico-chemical characteristics

• Molecular weight: 180.2
• Exact weight: 180.111008
• EU number: 242-809-3
• Polar Surface Area (PSA): 82.3
• Boiling point: 392.5 °C at 760 mm Hg. Art.
• Flash point: 191.2 °C

Substance class and purpose

The product of neutralization of adipic acid with ammonia is a salt of an aliphatic dicarboxylic acid with the formula HOOC-(CH2)4-COOH, in which both protons of the carboxyl groups are replaced by an ammonium cation (the index x in the formula C6H10O4,xH3N reflects the variable ratio of ammonia to acid - from acidic monoammonium to medium diammonium salt). Adipic acid and its salts are used as components of buffer and acidity-regulating systems, intermediate products in the synthesis of polyamides and polyesters, and ammonium salt is additionally used as a source of bound nitrogen and carboxylate groups in special compositions - pH regulators of food and technical liquids, components of compositions for galvanic and textile treatments, where a combination of a weakly acidic buffer action with the presence of ammonium ion is required.

Scope of application

• buffer and pH-regulating compositions for technical and food liquids
• intermediate product of organic synthesis based on adipic acid
• technical fluids for textile and galvanic processing
• component of compositions where the simultaneous presence of carboxylate ion and ammonium cation is required

Storage and transportation

Store in a closed container in a cool, dry place. Given the high boiling point (392.5 °C) and flash point (191.2 °C), the substance is not flammable under normal storage conditions, but heating above the flash point and contact with open flame should be avoided. Transportation does not require special labeling of increased danger if the general rules for storing solid organic salts are observed. As a salt of a weak acid and a weak base (ammonia), the product is prone to gradual loss of ammonia during long-term storage in open containers, especially in warm and dry air, which over time shifts the composition towards free adipic acid - this should be taken into account when monitoring the quality of long-term storage batches.

Quality control and composition features

Since the formula C6H10O4,xH3N does not denote a strictly stoichiometric compound, but a family of salts with variable ammonia content, when accepting a batch it is advisable to control the actual ratio of ammonium and adipate ion - the buffer capacity of the solution and the content of available nitrogen depend on this. When dissolved in water, the product gives a slightly acidic or close to neutral reaction of the medium, depending on the degree of substitution of carboxyl groups.