Nickel compositions for preparing nickel metal and nickel complexes
AssigneeInvista North America S.A.R.L.
InventorJohn J. Ostermaier
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Abstract
Nickel compositions for use in manufacturing nickel metal compositions, and specifically to methods of making basic nickel carbonates used to produce nickel metal compositions are disclosed. By varying the molar ratios of carbonates and bicarbonates to nickel salts, the methods provide basic nickel carbonates that produce superior nickel-containing solids that react more effectively with phosphorous-containing ligands. The phosphorous containing ligands can be both monodentate and bidentate phosphorous-containing ligands.
Claims19
A method of making an organic-soluble complex of nickel metal with a phosphorus-containing ligand, the method comprising
- a. contacting a precipitant solution with a nickel solution in a precipitation reactor to form a reaction mixture, wherein the precipitant solution is added to the nickel solution in the precipitation reactor in a semi-continuous or continuous manner;
- and
- b. precipitating a nickel-containing composition comprising nickel ions from said reaction mixture;
- wherein said nickel solution comprises nickel(II) ions and water and said precipitant solution is selected from the group consisting of:
- (i) bicarbonate ions and water, (ii) carbonate ions and water, and (c) mixtures thereof;
- and further wherein the mole ratio of bicarbonate ions to nickel ions in the reaction mixture is between 0.8:1 and 1.8:1 and said mole ratio of carbonate ions to nickel ions in the reaction mixture is between 0.8:1 and 1.6:1, to provide the nickel-containing composition;
- the method further comprising
- c. then, reducing the nickel-containing composition to nickel metal with a reducing agent, optionally at an elevated temperature;
- then,
- d. contacting the nickel metal and a phosphorus-containing ligand, to provide an organic-soluble nickel-ligand complex suitable as a catalyst for a hydrocyanation reaction.
Dependencies are inferred from the claim text.