Sodium aluminosilicate refers to compounds which contain of 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.
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Amorphous sodium aluminosilicate
This substance ( CAS 1344-00-9) 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
Naturally occurring minerals which are sometimes given the chemical name, sodium aluminosilicate include
Albite, NaAlSi3O8, an end-member of the plagioclase series
Jadeite NaAlSi2O6.
Synthetic Zeolites
These have complex structures and examples (with structural formulae) are:
Na12Al12Si12O48.27H2O, zeolite A ( Linde type A sodium form, NaA) which is used in laundry detergents.[1]
Na16Al16Si32O96.16H2O, Analcime, IUPAC code ANA.[1]
Na12Al12Si12O48·q H2O Losod [2] Na384Al384Si384O1536.518H2O, Linde type N
References
- ^ a b Alan Dyer, (1994),Encyclopedia of Inorganic Chemistry, ed R. Bruce King, John Wiley & Sons, ISBN 0471936200
- ^ Formation and Properties of Losod, a New Sodium Zeolite, Werner Sieber, Walter M. Meie Helvetica Chimica Acta, Volume 57 Issue 6, Pages 1533 – 1549, 10.1002/hlca.19740570608
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