METHOD OF PRODUCING HYDROTALCITE-LIKE COMPOUNDS Russian patent published in 2009 - IPC C01F5/00 A01F7/00 C01F17/00 C01G49/00 

FIELD: chemistry.

SUBSTANCE: method of producing layered hydroxides of formula Mg_(1-X)Me_x ³⁺(OH)₂(CO₃)_x/2·nH₂O, where the trivalent metal is scandium Sc³⁺ or iron and aluminium at the same time in the form Fe_yAl_x-y, where y is less than x and x is not more than 0.4. A solution containing Mg²⁺ and Sc³⁺ chlorides or nitrates, or a solution containing Mg²⁺ and Al³⁺ chlorides or nitrates and Fe³⁺ sulphates or chlorides or nitrates is added to a precipitation agent solution, containing sodium hydroxide and sodium carbonate. The ratio of ions Me³⁺: Mg²⁺: [OH^-] : [CO₃ ^2-] in the solution is 1:3:8:1. The precipitate formed is kept in a mother solution at 96-98°C for two days. After cooling to room temperature, the mother solution with the precipitate is decanted. The residue is subjected to anion exchange with Na₂CO₃ three times. After settling, the solution is decanted and the residue is washed with distilled water until negative results of presence of sodium ions are obtained, and then dried at 80-105°C. Total concentration of metal salts in the precipitation agent solution is not more than 3 M, and total concentration of the precipitation agent solution is not more than 3 M.

EFFECT: obtaining good crystallised, homogeneous samples of hydrotalcite-like compounds, wider field of their use.

4 dwg, 4 ex