Synthetic hydrotalcite
AssigneeAluminum Company of America
InventorChanakya Misra
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for producing hydrotalcite in high yield including reacting activated magnesia with an aqueous solution containing aluminate, carbonate, and hydroxyl ions. The [method further includes a first step of] activated magnesia is produced by heating magnesium carbonate or magnesium hydroxide to a temperature between about 500.degree.-900.degree. C. [to form activated magnesia or magnesium oxide.] The method is suited to producing synthetic hydrotalcite from industrial Bayer liquor.
Claims35
A method of producing hydrotalcite, comprising:
- (a) heating magnesium carbonate or magnesium hydroxide to a temperature between about 500.degree.-900.degree. C. to form activated magnesia;
- and
- (b) reacting activated magnesia with an aqueous solution of aluminate, carbonate, and hydroxyl ions at a pH above about 13 to form hydrotalcite at a conversion yield greater than about 75%.
A method of producing a material having a powder X-ray diffraction pattern of the mineral hydrotalcite comprising:
- (a) heating magnesium carbonate or magnesium hydroxide to a temperature between about 500.degree.-900.degree. C. to form activated magnesia;
- and
- (b) reacting said activated magnesia with an aqueous solution of aluminate, carbonate, and hydroxyl ions at a pH above 13 to from hydrotalcite at a conversion yield greater than about 75%.
A method of producing hydrotalcite comprising:
- reacting activated magnesia produced by heating magnesium carbonate or magnesium hydroxide to between about 500.degree.-900.degree. C. with an aqueous solution containing aluminate, carbonate and hydroxyl ions at a pH above about 13 to form hydrotalcite at a conversion yield greater than about 75%.
A method of producing a material having a powder X-ray diffraction pattern containing the mineral hydrotalcite comprising:
- reacting activated magnesia produced by heating magnesium carbonate or magnesium hydroxide to a temperature between about 500.degree.-900.degree. C. with an aqueous solution of aluminate, carbonate, and hydroxyl ions at a pH above about 13 to form hydrotalcite at a conversion yield greater than about 75%.
A method of producing hydrotalcite comprising reacting activated magnesia produced by heating magnesium carbonate or magnesium hydroxide to between about 500.degree. and 900.degree. C. with an aqueous solution containing aluminate, carbonate and hydroxyl ions to form hydrotalcite at a conversion yield greater than about 75%.
Dependencies are inferred from the claim text.