Process for preparing hydrated alumina consisting essentially of

Details Process for preparing hydrated alumina consisting essentially of Process for preparing hydrated alumina consisting essentially of

1989-05-26

1990-02-20

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423122, 423127, 423628, 423629, C01F 702

Patent

active

049024949

ABSTRACT:
A process for preparing hydrated alumina consisting essentially of spherical particles having a narrow granulometric distribution (polydispersion index dw/dn.ltoreq.2) starting from aqueous solution of aluminum sulphate, the molar ratio SO.sub.4.sup.= /Al.sup.3+ being greater than 1, by homogeneous precipitation in the presence of cationic polyelectrolytes, which are soluble under the reaction conditions and have a mean molecular weight higher than one million and an ionicity, deriving from the cationic groups present in the polyelectrolyte, of at least 3 milliequivalents/gram.

REFERENCES:
patent: 4320074 (1982-03-01), Birchall et al.
Willard, Hobart H. and Tang, Ning Kang, "A Sudy of the Precipitation of Aluminum Basic Sulfate by Urea", J. Am. Chem. Soc. 59, 1190-1196, (1937).
Brace & Matijevic, "Aluminum Hydrous Oxide Sols-I-Spherical Particles of Narrow Size Distribution", J. Inorg. Nucl. Chem., 1973, vol. 35, pp. 3961-3705.
Catone and Matijevic, "Aluminum Hydrous Oxide Sols-II. Preparation of Uniform Spherical Particles by Hydrolysis of Al sec-Butoxide", Journal of Colloid and Interface Science, vol. 48, No. 2, Aug. 1974.
Wang and Shuster, "Polyelectrolyte Determination at Low Concentration," Ind. Eng. Chem., Prod. Res. Dev., vol. 14, No. 4, 1975.
Collins et al., "Review of Common Methods of Particle Size Measurement", Journal of Paint Technology, vol. 47, No. 604, May 1975, pp. 35-56.

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