Granted Patent B2

US 8,518,369 · App. 13/538,166 · Granted Aug 27, 2013

Abstract

Claims (21)

1. A process for the preparation of powder of zeolite impregnated with titanium dioxide, comprising:

preparing a sodium aluminate solution comprising ATH-aluminum trihydrate, sodium hydroxide, and water;

adding titanium dioxide to the sodium aluminate solution with agitation;

combining the sodium aluminate solution comprising ATH-aluminum trihydrate, sodium hydroxide, water, and titanium dioxide with sodium silicate;

heating the solution comprising ATH-aluminum trihydrate, sodium hydroxide, water, titanium dioxide, and sodium silicate until the formation of a slurry comprising zeolite crystals impregnated with titanium dioxide; and

filtering and washing the slurry and drying the cake to produce a powder of zeolite impregnated with titanium dioxide.

2. The process of claim 1 , wherein the solution comprising aluminum trihydrate, sodium hydroxide, water, titanium dioxide, and sodium silicate includes those reagents in the following amounts by weight prior to heating:

ATH-aluminum trihydrate at 10 to 40%;

sodium hydroxide at 1 to 20%;

water at 5 to 70%;

titanium dioxide at 1 to 20%; and

sodium silicate solution at 5 to 50%.

3. The process of claim 1 , wherein the solution comprising aluminum trihydrate, sodium hydroxide, water, titanium dioxide, and sodium silicate includes those reagents in the following amounts by weight prior to heating:

ATH-aluminum trihydrate at 15 to 25%;

sodium hydroxide at 1 to 10%;

water at 30 to 60%;

titanium dioxide at 1 to 10%; and

sodium silicate solution at 15 to 30%.

4. The process of claim 1 , wherein the powder of zeolite impregnated with titanium dioxide includes, by weight, from 1% to 70% titanium dioxide and from 30% to 99% zeolite.

5. The process of claim 1 , further comprising calcining said powder.

6. The process of claim 1 , wherein said calcining results in said powder including an amount of water less than 5% of the powder by weight.

Assignments (17)