BigPatents India

This invention relates to an improved process for the hydrothermal synthesis of boehmite, a-alumina or their mixtures in doped form. In the present process fine crystalline powders of doped boehmite, a-lumina or their mixtures from commercial aluminium metal stock in a single step are obtained by hydrothermal synthesis. The boehmite, a alumina oe their mixtute in doped forms are obtained by taking dopants like chromium (for ruby or pink alumina), manganese (brown alumina), magnesium (for spinel) in the form of water soluble salt or aluminium alloys containing the dopant (A1-Mg alloys) along with initial reactants and conducting hydrothermal reaction.