Sodium aluminosilicate

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Sodium aluminosilicate
Identifiers
CAS number 1344-00-9
PubChem 19758701
ChemSpider 14398681 YesY
Jmol-3D images Image 1
Properties
Molecular formula AlNa12SiO5
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Sodium aluminosilicate is an acid salt comprising sodium, aluminium, silicon and oxygen. These include synthetic amorphous sodium aluminosilicate, a few naturally occurring minerals and synthetic zeolites. Synthetic amorphous sodium aluminosilicate is widely used as a food additive, E-554.

FDA approval[edit]

The FDA has as of April 1, 2012 approved sodium aluminosilicate (sodium silicoaluminate) for direct contact with consumable items under 21 CFR 182.2727.[1] Sodium aluminosilicate is used as molecular sieve in medicinal containers to keep contents dry and as food additive having E-number E-554 (anti-caking agents).

Amorphous sodium aluminosilicate[edit]

This substance is produced with a wide range of compositions and has many different applications. It is encountered as an additive E-554 in food where it acts as an anticaking (free flow) agent. As it is manufactured with a range of compositions (see [1] and so is not strictly a chemical compound with a fixed stoichiometry, one supplier ([2] ) quotes a typical analysis for one of their products as 14SiO2·Al2O3·Na2O·3H2O,(Na2Al2Si14 O32·3H2O).

Sodium aluminosilicate may also be listed as:

  • aluminium sodium salt
  • sodium silicoaluminate
  • aluminosilicic acid, sodium salt
  • sodium aluminium silicate
  • aluminum sodium silicate
  • sodium silico aluminate
  • sasil

Minerals[edit]

Naturally occurring minerals that are sometimes given the chemical name, sodium aluminosilicate include albite (NaAlSi3O8, an end-member of the plagioclase series) and jadeite (NaAlSi2O6).

Synthetic zeolites[edit]

Synthetic zeolites have complex structures and examples (with structural formulae) are:

  • Na12Al12Si12O48·27H2O, zeolite A (Linde type A sodium form, NaA), used in laundry detergents[2]
  • Na16Al16Si32O96·16H2O, Analcime, IUPAC code ANA[2]
  • Na12Al12Si12O48·q H2O, Losod[3]
  • Na384Al384Si384O1536·518H2O, Linde type N

References[edit]

  1. ^ "Sec. 182.2727 Sodium aluminosilicate.". U.S. Food and Drug Administration. 1 April 2012. Retrieved 10 December 2012. 
  2. ^ a b Alan Dyer, (1994),Encyclopedia of Inorganic Chemistry, ed R. Bruce King, John Wiley & Sons, ISBN 0-471-93620-0
  3. ^ "Formation and Properties of Losod, a New Sodium Zeolite", Werner Sieber, Walter M. Meie Helvetica Chimica Acta, Volume 57 Issue 6, pp. 1533–1549, 10.1002/hlca.19740570608