US4185960A
Expired / Lapsed
US
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Super-oxidized solid sodium perborate and processes for its manufacture
Assignee: Solvay Chimie SA
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Filing: 1978-04-10
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Granted: 1980-01-29
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Expires: 1998-04-10
Abstract
Abstract Superoxidized solid sodium perborate contains more than 17 wt.% active oxygen and less than 1.4 atoms hydrogen per active oxygen atom. The superoxidized solid sodium perborate in particle form is prepared by simultaneously introducing, into a fluidized bed dryer containing seeds of dimensions smaller than those of the perborate particles which are to be obtained, an aqueous solution containing hydrogen peroxide in concentrations above 30 wt.% and an aqueous solution containing sodium metaborate in such quantities that the molar ratio between the hydrogen peroxide and the sodium metaborate introduced into the fluidized bed is above 1.12. The water present in the aqueous solutions is evaporated by means of a fluidizing gas.
Inventors
- 👤 Jean Brichard
- 👤 Jean-Claude Colery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:53
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/055; C01B15/12; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; C11; C11D; C11D3/00; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
22 words
Superoxidized solid sodium perborate which contains more than 17 wt.% active oxgyen and less than 1.4 atoms hydrogen per active oxygen atom.
Claim 2
Dependent Claim
22 words
Superoxidized solid sodium perborate which contains more than 17 wt.% active oxgyen and less than 1.4 atoms hydrogen per active oxygen atom.
Claim 3
Dependent Claim
25 words
Sodium perborate according to claim 1 which contains between 17 and 32 wt.% active oxygen and 0.7 to 1.4 hydrogen atom per active oxygen atom.
Claim 4
Dependent Claim
25 words
Sodium perborate according to claim 2 which contains between 17 and 28 wt.% active oxygen and 0.9 to 1.3 hydrogen atom per active oxygen atom.
Claim 5
Dependent Claim
14 words
Sodium perborate according to claim 3 which contains 22 to 27 wt.% active oxygen.
Claim 6
Dependent Claim
91 words
Process for the production of superoxidized solid sodium perborate in particle form, comprising: simultaneously introducing into a fluidized bed dryer containing seeds of dimensions smaller than those of the perborate particles which are to be obtained, an aqueous solution containing hydrogen peroxide in concentrations above 30 wt.% and an aqueous solution containing sodium metaborate in such quantities that the molar ratio between the hydrogen peroxide and the sodium metaborate introduced into the fluidized bed is above 1.12, and evaporating the water present in the aqueous solutions by means of fluidizing gas.
Claim 7
Dependent Claim
91 words
Process for the production of superoxidized solid sodium perborate in particle form, comprising: simultaneously introducing into a fluidized bed dryer containing seeds of dimensions smaller than those of the perborate particles which are to be obtained, an aqueous solution containing hydrogen peroxide in concentrations above 30 wt.% and an aqueous solution containing sodium metaborate in such quantities that the molar ratio between the hydrogen peroxide and the sodium metaborate introduced into the fluidized bed is above 1.12, and evaporating the water present in the aqueous solutions by means of fluidizing gas.
Claim 8
Dependent Claim
18 words
Process according to claim 5 wherein the molar ratio of hydrogen peroxide to sodium metaborate is above 1.15.
Claim 9
Dependent Claim
20 words
Process according to claim 6 wherein the molar ratio of hydrogen peroxide to sodium metaborate is between 1.2 and 3.
Claim 10
Dependent Claim
20 words
Process according to claim 7 wherein the molar ratio of hydrogen peroxide to sodium metaborate is between 1.7 and 3.
Claim 11
Dependent Claim
19 words
Process according to claim 5 wherein the temperature of the fluidized bed is between ambient temperature and 95° C.
Claim 12
Dependent Claim
20 words
Process according to claim 5 wherein the aqueous solution containing hydrogen peroxide contains 30 to 90 wt.% of hydrogen peroxide.
Claim 13
Dependent Claim
19 words
Process according to claim 10 wherein the aqueous solution containing hydrogen peroxide contains 35 to 80 wt.% hydrogen peroxide.
Claim 14
Dependent Claim
19 words
Process according to claim 5 wherein the aqueous solution containing sodium metaborate contains 5 to 40 wt.% sodium metaborate.
Claim 15
Dependent Claim
19 words
Process according to claim 12 wherein the aqueous solution containing sodium metaborate contains 10 to 35 wt.% sodium metaborate.
Claim 16
Dependent Claim
33 words
Process according to claim 5 wherein the seeds of dimensions smaller than those of the granules which are to be obtained consist at least partly of fine recycled particles of superoxidized sodium perborate.
Claim 17
Dependent Claim
17 words
Bleaching process wherein superoxidized solid sodim perborate according to claim 1 is used as the bleaching agent.
References Cited (Backward Citations)
GB798217A
Cited
GB845846A
Cited
FR1590710A
Cited
US3598524A
Cited
US3661510A
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US3832447A
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US3985862A
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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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |