US5385753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reactively coating particles
Assignee: NATIONAL INSTITUTE FOR STRATEGIC TECHNOLOGY ACQUISITION AND COMMERCIALIZATION
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Filing: 1993-08-30
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Granted: 1995-01-31
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Expires: 2013-08-30
Abstract
Abstract Coated particles having properties such as to make them suitable as replacements for titanium dioxide particles can be obtained by reacting a titanium or zirconium halide, ether, or ester with zeolite hydrate particles so as to coat the zeolite particles with titania or zirconia. The reaction is preferably conducted between a titanium compound, such as titanium tetrachloride, and the zeolite in an inert medium, such as anhydrous or substantially anhydrous air or a hydrocarbon.
Inventors
- 👤 Patrick C. Hu
- 👤 Richard I. Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/405; B; B01; B01J; B01J2/00; B01J2/006; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A process which comprises contacting zeolite particles with a titanium or zirconium compound selected from the group consisting of halides, ethers, and esters in an anhydrous or substantially anhydrous inert medium so as to react said compound with the water of hydration of the zeolite and form a titania or zirconia coating on the particles.
Claim 2
Dependent Claim
55 words
A process which comprises contacting zeolite particles with a titanium or zirconium compound selected from the group consisting of halides, ethers, and esters in an anhydrous or substantially anhydrous inert medium so as to react said compound with the water of hydration of the zeolite and form a titania or zirconia coating on the particles.
Claim 3
Dependent Claim
10 words
The process of claim 1 conducted in a hydrocarbon slurry.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the titanium or zirconium compound is a halide.
Claim 5
Dependent Claim
17 words
The process of claim 3 conducted in the presence of an ammonia stream and/or an acid scavenger.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the halide is titanium tetrachloride.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the titanium or zirconium compound is an ether.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein the ether is titanium ethoxide.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the titanium or zirconium compound is an ester.
Claim 10
Dependent Claim
11 words
The process of claim 8 wherein the ester is titanium oxalate.
Claim 11
Dependent Claim
32 words
The process of claim 1 wherein the coated zeolite particles formed by the reaction are treated by (a) recovering them from the reaction mixture, if necessary, (b) washing, and (c) drying them.
Claim 12
Dependent Claim
26 words
The process of claim 10 wherein the washed coated particles are completely dried and then pulverized so that they have a particle size of 0.5-10 μm.
Claim 13
Dependent Claim
21 words
The process of claim 11 wherein the pulverized particles are heated at 600°-1100° C. to stabilize them against readsorption of water.
Claim 14
Dependent Claim
13 words
The process of claim 12 wherein the particles are heated at 800° C.
Claim 15
Dependent Claim
42 words
The process of claim 10 wherein the washed coated particles are partially dried, rehydrated, and contacted with an additional amount of said titanium or zirconium compound in an inert medium so as to thicken said titania or zirconia coating on the particles.
Claim 16
Dependent Claim
44 words
The process of claim 14 wherein the coated zeolite particles formed by the reaction are treated by (a) recovering them from the reaction mixture, if necessary, (b) washing, (c) drying and (d) pulverizing them so that they have a particle size of 0.5-10 μm.
Claim 17
Dependent Claim
21 words
The process of claim 15 wherein the pulverized particles are heated at 600°-1100° C. to stabilize them against readsorption of water.
Claim 18
Dependent Claim
13 words
The process of claim 16 wherein the particles are heated at 800° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-30 | 1998-08-01 | 1999-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-30 | 2002-08-01 | 2003-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-30 | 2006-08-01 | 2007-01-31 | $7700.00 | Window Closed / Lapsed |