Process for the preparation of hydrated aluminium oxides by precipitation from aluminium salts in presence of crystallization seeds

摘要

In the production of hydrated alumina (I) by precipitation from basic and/or acid aluminum (Al) salts, precipitation is carried out from an aqueous medium containing crystallization seeds, which have an average diameter of 12-250 nm in the medium. In the production of hydrated alumina (I) by precipitation from basic and/or acid aluminum (Al) salts, precipitation is carried out from an aqueous medium containing crystallization seeds, which have an average diameter of 12-250 nm in the medium and comprise (a) (I) and/or alumina seeds and/or (b) organic polymer/oligomer forming a lattice in the medium, in an amount of 0.1-5 wt.% with respect to (I), calculated as oxide (Al2O3). An Independent claim is also included for boehmitic and/or pseudoboehmitic alumina with a pore volume of 1.0-1.6 ml/g and an average pore radius of 6-12 nm at a crystallite size of 3-5 nm, determined at 120 reflection, produced by this process.