Preparation of solutions of basic aluminium nitrate
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United States of America Patent
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Oct 27, 1981
Grant Date -
N/A
app pub date -
Jun 19, 1980
filing date -
Jun 26, 1979
priority date (Note) -
Expired
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Abstract
A process for the preparation of stable, liquid aqueous solutions of basic aluminium nitrate (aluminium oxynitrate) suitable for spinning into fibres, if desired after incorporation of a polymeric spinning aid, which process comprises reacting an aluminium oxide with nitric acid at below 25.degree. C. to form aluminium hydroxide, optionally washing the precipitate to remove undesirable ions, e.g. sodium ions, and digesting the precipitate in nitric acid or aluminium nitrate. Preferably the solution contains aluminium ions and nitrate ions in the molar ratio 1.6:1 to 2:1. Silica may be incorporated in the solution by reacting it with the nitric acid, together with the aluminium oxide, in the first step of the process.
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