Preparation of pure titanium dioxide with anatase crystal structure from titanium oxychloride solution
First Claim
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1. A method for producing titanium dioxide with anatase crystal structure, comprising the steps of:
- (a) providing a titanium oxychloride solution;
(b) providing a quantity of an organic reagent selected from the group consisting of sugar, polyhydric alcohols, starch and organic acids which readily form complexes with metal ions;
(c) adding said organic reagent in an amount equivalent to about 0.1 to about 10.0% by weight based on titanium dioxide concentration to said titanium oxychloride solution;
(d) providing a seed suspension of titanium dioxide;
(e) adding said seed suspension to the resultant solution from step (c);
(f) heating said resultant solution including said seed suspension to boiling and continuing boiling for a period sufficient to effect precipitation of titanium hydrolysate;
(g) recovering the precipitated titanium hydrolysate; and
(h) calcining said precipitated titanium hyrolystate to form an anatase titanium dioxide as the final product.
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Abstract
A method for producing titanium dioxide with an anatase crystal structure from a titanium oxychloride solution. Titanium tetrachloride is mixed with water to form titanium oxychloride, which in turn is mixed with an organic reagent, preferably sorbitol. The resulting solution is hydrolyzed, precipitated and calcined to form titanium dioxide with an anatase crystal structure.
57 Citations
20 Claims
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1. A method for producing titanium dioxide with anatase crystal structure, comprising the steps of:
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(a) providing a titanium oxychloride solution; (b) providing a quantity of an organic reagent selected from the group consisting of sugar, polyhydric alcohols, starch and organic acids which readily form complexes with metal ions; (c) adding said organic reagent in an amount equivalent to about 0.1 to about 10.0% by weight based on titanium dioxide concentration to said titanium oxychloride solution; (d) providing a seed suspension of titanium dioxide; (e) adding said seed suspension to the resultant solution from step (c); (f) heating said resultant solution including said seed suspension to boiling and continuing boiling for a period sufficient to effect precipitation of titanium hydrolysate; (g) recovering the precipitated titanium hydrolysate; and (h) calcining said precipitated titanium hyrolystate to form an anatase titanium dioxide as the final product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for producing titanium dioxide with an anatase structure, comprising the steps of:
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(a) providing a quantity of titanium tetrachloride; (b) adding said titanium tetracholoride to water to form a titanium oxychloride solution containing from about 50 to about 300 g of titanium dioxide equivalent per liter of solution; (c) providing a quantity of an organic reagent selected from the group consisting of sugar, polyhydric alcohols, starch, and organic acids which readily form complexes with metal ions; (d) adding said organic reagent to said titanium oxychloride solution to form a resultant solution containing from about 0.1% to about 10.0% organic reagent by weight based on titaniam dioxide concentration in said solution; (e) providing a seed suspension of titanium dioxide containing the equivalent of from about 0.1% to 10.0% by weight based on titanium dioxide concentration in said solution; (f) adding said seed suspension to said resultant solution; (g) heating said resultant solution to boiling and continuing boiling for a period sufficient to effect precipitation of titanium hydrolysate; (h) recovering the precipitated titanium hydrolysate; (i) calcining said precipitated titanium hydrolysate to form an anatase titanium dioxide as the final product. - View Dependent Claims (20)
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Specification