Modification of layered double hydroxides
AssigneeSCG Chemicals Co., Ltd.
InventorsDermot O'Hare, Qiang Wang
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Abstract
The present invention relates to a process for modifying a layered double hydroxide (LDH), the process comprising, a. providing a material comprising a layered double hydroxide of formula: [Mz+1-xM′y+x(OH)2]q+(Xn−)q/n.bH2O wherein M and M′ are metal cations, z is 1 or 2, x is 0.1 to 1, b is 0 to 5, y is 3 or 4, X is an anion, n is 1 to 3 and q is determined by x, y and z, b. optionally washing the material at least once with a mixture of water and a mixing solvent miscible with water, and c. washing the material obtained in step a or b at least once with at least one first solvent, the first solvent being miscible with water and having a solvent polarity P′.
Claims20
A modified layered double hydroxide obtained by washing a particulate comprising a layered double hydroxide at least once with a first solvent to obtain a modified layered double hydroxide, wherein the layered double hydroxide has the formula
- [Mz+1-xM′y+x(OH)2]q+(Xn−)q/n.bH2O
- wherein M and M′ are metal cations, z is 1 or 2, x is 0.1 to 1, b is 0 to 5, y is 3 or 4, X is an anion, n is 1 to 3 and q is determined by x, y and z;
- and wherein the first solvent is a water miscible solvent having a solvent polarity P′ in the range of 3.8 to 9,
- wherein the modified layered double hydroxide is dispersible in a hydrocarbon solvent.
A method for forming a modified layered double hydroxide, the method comprising washing a particulate comprising a layered double hydroxide at least once with a first solvent to obtain a modified layered double hydroxide, wherein the layered double hydroxide has the formula
- [Mz+1-xM′y+x(OH)2]q+(Xn−)q/n.bH2O
- wherein M and M′ are metal cations, z is 1 or 2, x is 0.1 to 1, b is 0 to 5, y is 3 or 4, X is an anion, n is 1 to 3 and q is determined by x, y and z;
- and wherein the first solvent is a water miscible solvent having a solvent polarity P′ in the range of 3.8 to 9,
- wherein the modified layered double hydroxide is dispersible in a hydrocarbon solvent.
Dependencies are inferred from the claim text.