SILICON-TITANIUM MIXED OXIDE-CONTAINING DISPERSION FOR THE PRODUCTION OF TITANIUM-CONTAINING ZEOLITES
First Claim
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1. :
- A process for the production of a dispersion comprising pyrogenic silicon-titanium mixed oxide powder with a silicon dioxide content of 75 to 99.99 wt % and a titanium dioxide content of 0.01 to 25 wt %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of particles of the silicon-titanium mixed oxide powders in the dispersion is 200 nm at most,said process comprising;
water, which, in the event that the silicon-titanium mixed oxide powder incorporated later leads to a pH value of the aqueous phase of <
2 or >
4, is adjusted to pH values of 2 to 4 by addition of acids or bases, is circulated from a holding tank through a rotor/stator machine, and via a filling device, silicon-titanium mixed oxide powder is continuously or discontinuously introduced into the shear zone between the grooves of the rotor teeth and the stator groove, with the rotor/stator machine running, in a quantity such that a predispersion with a solids content of 20 to 40 wt % results, andafter all the silicon-titanium mixed oxide powder has been added, the filling device is closed, and shearing continued such that the shear rate lies in the range between 10000 to 40000 sec−
1, and next, while maintaining the dispersing conditions, a basic, quaternary ammonium compound and optionally water, before the addition of the ammonium compound, are added.
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Abstract
Dispersion containing pyrogenic silicon-titanium mixed oxide powders with a silicon dioxide content of 75 to 99.99 wt.-% and a titanium dioxide content of 0.01 to 25 wt. %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of the particles of the silicon-titanium mixed oxide powder in the dispersion is 200 nm at most. Process for the production of a titanium-containing zeolite with the use of the dispersion.
4 Citations
6 Claims
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1. :
- A process for the production of a dispersion comprising pyrogenic silicon-titanium mixed oxide powder with a silicon dioxide content of 75 to 99.99 wt % and a titanium dioxide content of 0.01 to 25 wt %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of particles of the silicon-titanium mixed oxide powders in the dispersion is 200 nm at most,
said process comprising; water, which, in the event that the silicon-titanium mixed oxide powder incorporated later leads to a pH value of the aqueous phase of <
2 or >
4, is adjusted to pH values of 2 to 4 by addition of acids or bases, is circulated from a holding tank through a rotor/stator machine, and via a filling device, silicon-titanium mixed oxide powder is continuously or discontinuously introduced into the shear zone between the grooves of the rotor teeth and the stator groove, with the rotor/stator machine running, in a quantity such that a predispersion with a solids content of 20 to 40 wt % results, andafter all the silicon-titanium mixed oxide powder has been added, the filling device is closed, and shearing continued such that the shear rate lies in the range between 10000 to 40000 sec−
1, and next, while maintaining the dispersing conditions, a basic, quaternary ammonium compound and optionally water, before the addition of the ammonium compound, are added.
- A process for the production of a dispersion comprising pyrogenic silicon-titanium mixed oxide powder with a silicon dioxide content of 75 to 99.99 wt % and a titanium dioxide content of 0.01 to 25 wt %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of particles of the silicon-titanium mixed oxide powders in the dispersion is 200 nm at most,
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2. :
- A process for the production of a titanium-containing zeolite, comprising processing at a temperature of 150 to 220°
C. for a time period of less than 12 hours a dispersion comprising pyrogenic silicon-titanium mixed oxide powder with a silicon dioxide content of 75 to 99.99 wt % and a titanium dioxide content of 0.01 to 25 wt %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of particles of the silicon-titanium mixed oxide powders in the dispersion is 200 nm at most. - View Dependent Claims (3, 4, 5, 6)
- A process for the production of a titanium-containing zeolite, comprising processing at a temperature of 150 to 220°
Specification