US4427644A
Expired / Lapsed
US
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Process for the preparation of bivalent metal peroxides
Assignee: Solvay Interox GmbH
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Filing: 1981-07-06
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Granted: 1984-01-24
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Expires: 2001-07-06
Abstract
Abstract Disclosed is a continuous process for the production of bivalent metal peroxides, comprising the steps of introducing into an intensive mixing apparatus a solid, anhydrous or hydrated oxide or hydroxide of a bivalent metal; simultaneously introducing into the intensive mixing apparatus a solution of hydrogen peroxide, whereby the solid bivalent metal compound and the peroxide are intensively mixed and react to produce a reaction mixture containing bivalent metal peroxide; transporting the reaction mixture directly to a rapid dryer; and rapidly drying the reaction mixture to produce the bivalent metal peroxide in solid form.
Inventors
- 👤 Werner Doetsch
- 👤 Helmut Dillenburg
- 👤 Paul-Wilhelm Fuchs
- 👤 Helmut Honig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:58
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
91 words
A continuous process for the production of bivalent metal peroxides, comprising the steps of: introducing into an intensive mixing apparatus a solid, anhydrous or hydrated oxide or hydroxide of a bivalent metal; simultaneously introducing into the intensive mixing apparatus a solution of hydrogen peroxide, whereby the solid bivalent metal compound and the peroxide are intensively mixed and react to produce a reaction mixture containing bivalent metal peroxide; transporting the reaction mixture directly to a rapid dryer; and rapidly drying the reaction mixture to produce the bivalent metal peroxide in solid form.
Claim 2
Dependent Claim
91 words
A continuous process for the production of bivalent metal peroxides, comprising the steps of: introducing into an intensive mixing apparatus a solid, anhydrous or hydrated oxide or hydroxide of a bivalent metal; simultaneously introducing into the intensive mixing apparatus a solution of hydrogen peroxide, whereby the solid bivalent metal compound and the peroxide are intensively mixed and react to produce a reaction mixture containing bivalent metal peroxide; transporting the reaction mixture directly to a rapid dryer; and rapidly drying the reaction mixture to produce the bivalent metal peroxide in solid form.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the bivalent metal comprises a metal of Group II of the Periodic System.
Claim 4
Dependent Claim
15 words
A process according to claim 2, wherein the bivalent metal comprises an alkaline earth metal.
Claim 5
Dependent Claim
12 words
A process according to claim 2, wherein the bivalent metal comprises zinc.
Claim 6
Dependent Claim
34 words
A process according to claim 1, wherein the average residence time for the reactants between entry into the intensive mixing apparatus and entry into the rapid dryer is between about 0.1 and 15 minutes.
Claim 7
Dependent Claim
18 words
A process according to claim 5, wherein said average residence time is between about 0.5 and 5 minutes.
Claim 8
Dependent Claim
31 words
A process according to claim 1, wherein the hydrogen peroxide comprises an aqueous solution having a content of from about 30 to 70% by weight of H 2 O 2 .
Claim 9
Dependent Claim
28 words
A process according to claim 1, wherein the metal oxide and/or hydroxide is introduced in an approximately stoichiometric proportion with respect to the H 2 O 2 .
Claim 10
Dependent Claim
14 words
A process according to claim 1, wherein the rapid dryer comprises a spray dryer.
Claim 11
Dependent Claim
14 words
A process according to claim 9, wherein the spray drier includes a centrifugal atomizer.
Claim 12
Dependent Claim
14 words
A process according to claim 1, wherein the rapid dryer comprises a flash dryer.
Claim 13
Dependent Claim
20 words
A process according to claim 1, further comprising the step of cooling the reaction mixture in the intensive mixing apparatus.
Claim 14
Dependent Claim
36 words
A process according to claim 1, wherein the rapid dryer comprises a dryer capable of essentially instantaneously drying the reaction mixture and the drying step comprises essentially instantaneously drying the reaction mixture in the rapid dryer.
Claim 15
Dependent Claim
28 words
A process according to claim 1, wherein the drying step comprises dividing the reaction mixture up into fine particles and drying the reaction mixture in fine particulate form.
Claim 16
Dependent Claim
16 words
A process according to claim 14, wherein the drying step comprises spray drying the reaction mixture.
Claim 17
Dependent Claim
12 words
A process according to claim 1, consisting essentially of the recited steps.
Claim 18
Dependent Claim
22 words
A process according to claim 1, wherein said introducing step comprises introducing a solid, anhydrous oxide or hydroxide of a bivalent metal.
References Cited (Backward Citations)
US2563442A
Cited
CA736415A
Cited
CA778323A
Cited
US2415443A
Cited
GB898058A
Cited
US3134646A
Cited
US3176444A
Cited
US3430418A
Cited
SU367050A1
Cited
US3801706A
Cited
US3986849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |