四りん酸ヘキサナトリウム 化学特性,用途語,生産方法
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Hexasodium tetraphosphate is formed by careful hydrolysis of
sodium tetrametaphosphate(method of Thilo and Ratz):
A solution of 4.8 g. of Na 4 P4 O 12 ? 4H2O in 85 ml. of hot water
is prepared, and after cooling, a solution of 0.8 g. of NaOH in
some water is added. The mixture is kept over H2SO4 in a vacuum
desiccator, placed in an oven at 40°C. The rat e of evaporation should be such that after about 100 hours no less than 8 to 10 ml.
remains. The solution is then diluted to 30 ml. and acetone is
added. The colorless oil formed is dissolved in some water and
reprecipitated with acetone.
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