US4925647A
Expired / Lapsed
US
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Process for the production of metal oxides or metal mixed oxides
Assignee: Hoechst AG
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Filing: 1987-09-22
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Granted: 1990-05-15
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Expires: 2007-09-22
Abstract
Abstract A process for the production of a metal oxide or metal mixed oxide is described, in which an aqueous solution of at least one water-soluble salt-like compound of a polyvalent metal is finely divided in an inert gas atmosphere. The droplets which are obtained are brought into contact with a gas containing ammonia, until such time as the hydroxide (the hydroxides) of the polyvalent metal (metals) is (are) at least partially precipitated, and the small gel spherules, which contain metal hydroxide and water, are collected. In this process, the aqueous solution which is employed is finely divided by ultrasonic waves. An intergas laminar flow which is oriented parallel to the outlet direction of the solution, is generated radially symmetrically about the outlet aperture for the solution, and the solidified get spherules are dried and converted, by heating, into the metal oxide or metal mixed oxide.
Inventors
- 👤 Hermann Kirchhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/34; B; B01; B01J; B01J10/00; B01J10/002; B01J19/00; B01J19/08; B01J19/10; B01J19/26; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01G; C01G25/00; C01G25/02; C01G49/00; C01G49/02; C01G49/06; C01G51/00; C01G51/04; C01G53/00; C01G53/04; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00121; C01P; C01P2002/00; C01P2002/02; C01P2002/30; C01P2002/34; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
142 words
A process for the production of a metal oxide or metal mixed oxide, comprising the steps of: applying ultrasonic waves to an aqueous solution of at least one water soluble salt of a polyvalent metal in an inert gas atmosphere to disperse the aqueous solution into droplets; passing the droplets through an outlet aperture into a reaction zone where they are brought into contact with a gas containing ammonia to at least partially precipitate the hydroxide of the polyvalent metal in the form of gel spherules which contain metal hydroxide and water; and collecting the gel spherules; wherein an inert gas laminar flow oriented parallel to the outlet direction of the aqueous solution is generated radially symmetrically about the outlet aperture for the solution, and the gel spherules are dried and converted, by heating, into the metal oxide or metal mixed oxide.
Claim 2
Dependent Claim
142 words
A process for the production of a metal oxide or metal mixed oxide, comprising the steps of: applying ultrasonic waves to an aqueous solution of at least one water soluble salt of a polyvalent metal in an inert gas atmosphere to disperse the aqueous solution into droplets; passing the droplets through an outlet aperture into a reaction zone where they are brought into contact with a gas containing ammonia to at least partially precipitate the hydroxide of the polyvalent metal in the form of gel spherules which contain metal hydroxide and water; and collecting the gel spherules; wherein an inert gas laminar flow oriented parallel to the outlet direction of the aqueous solution is generated radially symmetrically about the outlet aperture for the solution, and the gel spherules are dried and converted, by heating, into the metal oxide or metal mixed oxide.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the aqueous solution is divided into droplets by ultrasonic atomizers.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1, wherein the aqueous solution is divided into droplets by introduction into a standing ultrasonic wave.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 1, wherein the gel spherules are collected without interposition of a fluid phase.
Claim 6
Dependent Claim
36 words
The process as claimed in claim 2, wherein the droplets produced by the ultrasonic atomizer are permitted to fall downwards under the action of gravity, and are then brought into contact with the gas containing ammonia.
Claim 7
Dependent Claim
17 words
The process as claimed in claim 1, wherein the aqueous solution contains organic, water soluble polymeric compounds.
Claim 8
Dependent Claim
19 words
The process as claimed in claim 1, wherein the dried gel spherules are heated in an atmosphere containing oxygen.
Claim 9
Dependent Claim
16 words
The process as claimed in claim 1, wherein the gel spherules are washed with demineralized water.
Claim 10
Dependent Claim
16 words
The process as claimed in claim 6, wherein the gel spherules are dried at 70°-90° C.
Claim 11
Dependent Claim
16 words
The process as claimed in claim 14, wherein the walls of the reaction vessel are cooled.
Claim 12
Dependent Claim
16 words
The process as claimed in claim 14, wherein the walls of the reaction vessel are heated.
Claim 13
Dependent Claim
16 words
The process as claimed in claim 1, wherein the aqueous solution to be atomized is cooled.
Claim 14
Dependent Claim
16 words
The process as claimed in claim 1, wherein the aqueous solution to be atomized is heated.
Claim 15
Dependent Claim
19 words
The process as claimed in claim 1, wherein the process is carried out in a reaction vessel having wells.
Claim 16
Dependent Claim
13 words
The process as claimed in claim 1, consisting essentially of the recited steps.
Claim 17
Dependent Claim
18 words
The process as claimed in claim 1, wherein the aqueous solution consists essentially of the water soluble salt.
Claim 18
Dependent Claim
43 words
The process as claimed in claim 1, wherein the aqueous solution is heated so that a temperature exists in the reaction zone where the salt and the ammonia are in contact, that is higher than an equilibrium reaction temperature of about 50° C.
Claim 19
Dependent Claim
43 words
The process as claimed in claim 14, wherein the reactor walls are heated so that a temperature exists in the reaction zone where the salt and the ammonia are in contact, that is higher than an equilibrium reaction temperature of about 50° C.
Claim 20
Dependent Claim
43 words
The process as claimed in claim 1, wherein the aqueous solution is cooled so that a temperature exists in the reaction zone where the salt and the ammonia are in contact, that is lower than an equilibrium reaction temperature of about 50° C.
Claim 21
Dependent Claim
43 words
The process as claimed in claim 14, wherein the reactor walls are cooled so that a temperature exists in the reaction zone where the salt and the ammonia are in contact, that is lower than an equilibrium reaction temperature of about 50° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |