Quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylates, their preparation and their use
A technology for hydrating magnesium hydroxycarboxylate and hydrating hydroxycarboxylic acid is applied in the field of preparing magnesium-aluminum solid solution and anionic clay, and can solve the problems of limiting the operating conditions of the preparation method, equipment corrosion and the like
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Embodiment 1
[0060]The magnesium acetate solution was prepared as follows. To deionized water (1108 g) was added glacial acetic acid (996 g). To this solution, 335 g of MgO (Spectrum Chemical Company; Hoavy USPpower; MA125) was slowly added with stirring until the MgO was completely dissolved, resulting in a solution with a pH of 5.45.
Embodiment 2
[0062] An alumina sol was prepared by adding 50.0 g of Catapal A(R) to a mixture of 3.45 g of glacial acetic acid and 245.0 g of deionized water and mixing in a Waring mixer at high speed for 15 minutes. To the resulting mixture was added 103.4 g of the magnesium acetate solution of Example 1. The resulting mixture was mixed in a mixer for 20 minutes to obtain a gel having a pH of 5.53 and a Mg / Al molar ratio of 0.5. The gel was aged at 80°C for 27 hours in a closed container. The product was dried in an oven at 100°C overnight and ground to a fine powder.
[0063] figure 1 The PXRD pattern of the sample obtained by using CuK-α rays with a wavelength of 1.5418 Å is shown. The spectrum contains the characteristic reflection of unreacted pseudoboehmite and two reflections of the QCC at about 9° and 24° 2Θ, corresponding to intervals of about 11.1 and 3.7 Å. The reflection of the pseudo-boehmite phase hides a third QCC reflection near 38° 2θ (2.4 Å). figure 1 Also shown is...
Embodiment 3
[0065] Example 2 was repeated except that 413.5 g of magnesium acetate solution was used, resulting in a Mg / Al ratio of 2.0. The pH of the gel was 5.45. figure 2 The PXRD pattern of the product is shown. This pattern indicates the formation of QCC and pseudoboehmite. figure 2 Also shown is the PXRD pattern of this sample after calcination at about 732°C and subsequent rehydration. These patterns show that after calcination, both spinel and Mg / Al solid solution are present. By rehydrating the calcined material, the solid solution was transformed into anionic clay, brucite and magnesia.
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