Sodium aluminosilicate
From Wikipedia the free encyclopedia
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| IUPAC name aluminum sodium dioxido(oxo)silane | |
Other names
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3D model (JSmol) | |
| ECHA InfoCard | 100.014.259 |
| E number | E554 (acidity regulators, ...) |
PubChem CID | |
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CompTox Dashboard (EPA) | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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
[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 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
As a problem in industrial processes
[edit]The formation of sodium aluminosilicate makes the Bayer process uneconomical for bauxites high in silica.[citation needed]
Minerals sometimes called sodium aluminosilicate
[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).[citation needed]
Synthetic zeolites sometimes called sodium aluminosilicate
[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[4]
- Na16Al16Si32O96·16H2O, Analcime, IUPAC code ANA[4]
- Na12Al12Si12O48·q H2O, Losod[5]
- Na384Al384Si384O1536·518H2O, Linde type N
References
[edit]- ^ 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.
- ^ a b 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