Dried aluminium hydroxide

Shiba K, Saito A, Shimada J, Hori S, Kaji M, Miyahara T, Kusajima H, Kaneko S, Saito S, Uchida H, Interactions of fleroxacin with dried aluminium hydroxide gel and probenecid. Rev InfectDis (1989) 11 (Suppl 5), S1097-S1098,... 

Aluminium hydroxide gel and dried aluminium hydroxide gel may be assayed by the following method ... 

Tablets of Aluminium Hydroxide, B.P. Contain dried aluminium hydroxide gel and peppermint oil.

Compound Tablets of Magnesium Trisilicate, B.P.C, Each tablet contains 4 grains of magnesium trisilicate and 2 grains of dried aluminium hydroxide gel with peppermint oil. 

Aluminium oxide. The commercial material, activated alumina, is made from aluminium hydroxide it will absorb 15-20 per cent, of its weight of water, can be re-activated by heating at 175° for about seven hours, and does not appreciably deteriorate with repeated use. Its main application is as a drying agent for desiccators. 

Many surface modifications are used with aluminium hydroxide, which responds to both silane and fatty acid treatments. Special proprietary silane coatings seem to be preferred for polypropylene applications [99]. Despite the production being water based, the preference seems to be for dry coating procedures. 

If well-dried ammonia gas is passed over freshly sublimed aluminium chloride ammonia is rapidly absorbed, heat is developed, and the whole mass fuses and then gradually solidities as more ammonia is absorbed, leaving a white voluminous powder of composition A1C13.GNH3 or [A1(NH3)6]C13. Hexammino-aluminium chloride is stable at ordinary temperature and is much less hygroscopic than the chloride. It is decomposed by water with formation of aluminium hydroxide, and when heated in dry air is oxidised, yielding the oxide and ammonium chloride. If heated in an atmosphere of dry hydrogen it loses ammonia and passes into diammino-aluminium chloride, [A1(NH3)2]C13.5 Triammino-aluminium chloride obtained in this way by Persoz was not found by Stillmann and Yoder. 

Aluminium Hydroxide + Magnesium Carbonate Dry Syrup (12.5% + 12.5%) page 2... 

A suspension of aluminium hydroxide (9.57 g, corresponding to 5.09 g of Al203 0.05 mol) magnesium hydroxide of 92.09% purity (18.87 g 0.3 mol), triethylamine (33.4 g 0.33 mol) and water (500 ml) was boiled under reflux for 8 h while a stream of carbon dioxide was passed through the mixture. After cooling, the insoluble compound was filtered off, washed several times with water and dried at 60°C under reduced pressure. Basic aluminum magnesium carbonate (30.8 g) was obtained. 

Aluminium is tervalent in its compounds. Aluminium ions (Al3+) form colourless salts with colourless anions. Its halides, nitrate, and sulphate are water-soluble these solutions display acidic reactions owing to hydrolysis. Aluminium sulphide can be prepared in the dry state only, in aqueous solutions it hydrolyses and aluminium hydroxide, Al(OH)3, is formed. Aluminium sulphate forms double salts with sulphates of monovalent cations with attractive crystal shapes, these are called alums. 

Comparison of sorption capacities Vj of built-up samples with the additive quantities of sorption (Vs add.) shows that depending on the composition and thermal treatment, the latter vary from 0.32 to 0.39 cm /g, i.e., they are substantially lower than the experimental values. However, in reality, in the case of mechanical mixing of individual hydroxides of iron or aluminium Vs values must coincide since the sorption capacity is a statistical mean determined by the particle size of the components mixed and their arrangement. In the present case one of these conditions is violated as the particle size increases substantially as a result of building-up of particles. This is the main reason for the differences between Vs of the samples obtained and the additive sorption capacities (Vs add.). Moreover, shrinkage of hydroxide components in the process of drying and calcination makes a noticeable contribution to this process, which is observed especially distinctly for the samples of iron hydroxide built-up by aluminium hydroxide (Table 7). 

---