Properties of Aluminium Triphosphates

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Other Title
  • 三リン酸アルミニウムの諸性質
  • 三りん酸アルミニウムの諸性質

Abstract

For aluminium dihydrogentriphosphates, AlH2P3O10⋅H2O (I) and II type of AlH2P3O10(II) various fundamental properties, such as solubilities, densities, surface areas, and heats of reaction (e H) and activation energies (E) of their thermal change into aluminium metaphos phate Al(PO3)3, were measured. Further, the adsorption of ammonia gas and amines on aluminium triphosphates, as well as structures of cation-exchanged compounds AlM2P3O10. n H20 (M=Na, K, NH4), were investigated.<BR>1) At room temperature, solu bilities of I and II in water are found to be 0.01 and 0.05g/100 cm3 H2O, respectively. The order of their solubilities in various solvents is NH3>KOH >NaOH>HCl>H2O. 2) Densities of I and II are 2.31 and 2.60 g/cm3, and su rface areas are 5.2and <1 m2/g, respectively. 3) For both I and II, the heat of the thermal change into Al (PO3)3 was found to be 11.4 kcal/mol, while the activation energies are 25.3 and 61.9kcal/mol for I and II, respectively. 4) The temperature of the thermal change from I into Al(PO3) was proved to be closely correlated with the quantity of free phosphoric acid adhered to I. 5) Both I and II adsorb basic materials, such as ammonia gas and amines, quite well. 6) The sample of I, which has a stratified structure, is submitted to ion exchange with univalent metallic ions to form AlM2P3O10⋅n H2O (n= 2 for Na salt, for K salt, 2-1 for NH4 salt). Their crystal structures were destroyed with the decrease of n.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1982 (4), 590-594, 1982-04-10

    The Chemical Society of Japan

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