Sodium aluminosilicate

Sodium aluminosilicate
Names
	IUPAC name aluminum sodium dioxido(oxo)silane
	Other names Aluminosilicic acid, aluminum sodium silicate
Identifiers
CAS Number	1344-00-9 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.014.259
E number	E554 (acidity regulators, ...)
PubChem CID	19758701;
UNII	058TS43PSM ;
CompTox Dashboard (EPA)	DTXSID7026021 ;
	InChI InChI=1S/Al.Na.2O3Si/c;;21-4(2)3/q+3;+1;2-2 Key: URGAHOPLAPQHLN-UHFFFAOYSA-N ;
	SMILES [O-][Si](=O)[O-].[O-][Si](=O)[O-].[Na+].[Al+3];
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Sodium aluminosilicate refers to compounds which contain sodium, aluminium, silicon and oxygen, and which may also contain water. 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.

Amorphous sodium aluminosilicate

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 it is not strictly a chemical compound with a fixed stoichiometry.[1] One supplier quotes a typical analysis for one of their products as 14SiO₂·Al₂O₃·Na₂O·3H₂O,(Na₂Al₂Si₁₄O₃₂·3H₂O).[2]

The US FDA has as of April 1, 2012 approved sodium aluminosilicate (sodium silicoaluminate) for direct contact with consumable items under 21 CFR 182.2727.[3] Sodium aluminosilicate is used as molecular sieve in medicinal containers to keep contents dry.

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 sometimes called sodium aluminosilicate

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 sometimes called sodium aluminosilicate

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[4]
Na₁₆Al₁₆Si₃₂O₉₆·16H₂O, Analcime, IUPAC code ANA[4]
Na₁₂Al₁₂Si₁₂O₄₈·q H₂O, Losod[5]
Na₃₈₄Al₃₈₄Si₃₈₄O₁₅₃₆·518H₂O, Linde type N

References

United Nations Environment Programme Archived 2010-03-31 at the Wayback Machine
Solvay link no longer works
"Sec. 182.2727 Sodium aluminosilicate". U.S. Food and Drug Administration. 1 April 2012. Retrieved 10 December 2012.
Alan Dyer, (1994),Encyclopedia of Inorganic Chemistry, ed R. Bruce King, John Wiley & Sons, ISBN 0-471-93620-0
"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

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[1] United Nations Environment Programme Archived 2010-03-31 at the Wayback Machine

[2] Solvay link no longer works

[3] "Sec. 182.2727 Sodium aluminosilicate". U.S. Food and Drug Administration. 1 April 2012. Retrieved 10 December 2012.

[dyer-4] Alan Dyer, (1994),Encyclopedia of Inorganic Chemistry, ed R. Bruce King, John Wiley & Sons, ISBN 0-471-93620-0

[5] "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