Preparation of ultrapure boehmites and/or pseudo-boehmites

Details Preparation of ultrapure boehmites and/or pseudo-boehmites Preparation of ultrapure boehmites and/or pseudo-boehmites

1983-01-25

1985-01-08

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423625, 423630, 423631, C01F 702

Patent

active

044926820

ABSTRACT:
Ultrapure and homogeneous boehmites and/or pseudo-boehmites, suitable, whether before or after drying and/or calcination, as, e.g., fillers, binders, thickeners, dispersing agents, and the like, are prepared (i) by admixing an amorphous aluminum hydroxycarbonate, itself advantageously prepared by carbonating an alkali metal aluminate with carbon dioxide and then filtering and washing the precipitate which results, with a solution of an acid, a base, a salt, or mixture thereof, with the pH of the resulting reaction medium being maintained at a value of less than 11, (ii) next heating such reaction medium at a temperature of less than 90.degree. C. for a period of at least 5 minutes, and (iii) then heating the reaction medium resulting from the step (ii) at a temperature ranging from 90.degree. C. to 250.degree. C.

REFERENCES:
patent: 2898307 (1959-08-01), Keith
patent: 3268295 (1966-08-01), Armbrust et al.
patent: 3839536 (1974-10-01), Sato et al.
patent: 4344928 (1982-08-01), Derpin et al.

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