US4115519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing process for sodium perborate monohydrate and product obtained according to the process
Assignee: Solvay Chimie SA
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Filing: 1976-11-01
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Granted: 1978-09-19
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Expires: 1996-11-01
Abstract
Abstract Abrasion resistant granules of sodium perborate monohydrate are made by introducing an aqueous solution containing hydrogen peroxide and an aqueous solution containing sodium metaborate simultaneously into a fluidized bed dryer which contains seeds of a size smaller than that of the desired granules. Water present in the aqueous solutions is evaporated by fluidization gas which is introduced into the fluidized bed dryer. The process products, in one stage, granules of sodium perborate monohydrate having good flavorability, abrasion resistance, and other desirable properties.
Inventors
- 👤 Jean Brichard
- 👤 Jean-Claude Colery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:44
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/055; C01B15/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A process for the manufacture of sodium perborate monohydrate in the form of abrasion resistant granules, comprising introducing an aqueous solution containing hydroen peroxide and an aqueous solution containing sodium metaborate simultaneously into a fluidized bed dryer which contains seeds of a size which is smaller than that of the granules one wishes to obtain, and evaporating the water present in the said aqueous solutions by inroducing fluidization gas into the fluidized bed dryer.
Claim 2
Dependent Claim
74 words
A process for the manufacture of sodium perborate monohydrate in the form of abrasion resistant granules, comprising introducing an aqueous solution containing hydroen peroxide and an aqueous solution containing sodium metaborate simultaneously into a fluidized bed dryer which contains seeds of a size which is smaller than that of the granules one wishes to obtain, and evaporating the water present in the said aqueous solutions by inroducing fluidization gas into the fluidized bed dryer.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the temperature of the fluid bed is between the ambient temperature of 100 ° C.
Claim 4
Dependent Claim
19 words
A process according to claim 1, wherein the temperature of the fluid bed is between 35° and 95° C.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the temperature of the fluid bed is between 45°and 85° C.
Claim 6
Dependent Claim
22 words
A process according to claim 1, wherein the solution containing hydrogen peroxide contains from 5 to 75% by weight of hydrogen peroxide.
Claim 7
Dependent Claim
22 words
A process accoding to claim 1, wherein the solution containing hydrogen peroxide contains from 15 to 70% by weight of hydrogen peroxide.
Claim 8
Dependent Claim
22 words
A process according to claim 1, wherein the solution containing sodium metaborate contains from 5 to 40% by weight of sodium metaborate.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein the solution containing sodium metaborate contains from 10 to 35% by weight of sodium metaborate.
Claim 10
Dependent Claim
24 words
A process according to claim 1, wherein the molar ratio hydrogen peroxide:sodium metaborate introduced into the fluid bed dryer is between 1 and 1.12.
Claim 11
Dependent Claim
34 words
A process according to claim 1, wherein the seeds whose size is smaller than that of the granules one wishes to obtain and which are present in the fluid bed contain sodium perborate monohydrate.
Claim 12
Dependent Claim
28 words
A process according to claim 10, wherein the seeds of sodium perborate monohydrate are made up at least partially of fine sodium perborate monohydrate produced in the process.
Claim 13
Dependent Claim
79 words
Granules containing sodium perborate monohydrate of an apparent specific gravity when free flowing between 0.40 and 1.00 kg/dm 3 , of a flowability expressed by the time taken for a quantity of granules weighing 250 g to pass through the 16 mm diameter orifice of a short stemmed analysis funnel not exceeding 10 seconds, and of an abrasion index not exceeding 10%, as determined by the method described in the standard ISO/TC 47/WG11 (secretariat-86) 167 of British Standards Institution.
Claim 14
Dependent Claim
79 words
Granules containing sodium perborate monohydrate of an apparent specific gravity when free flowing between 0.40 and 1.00 kg/dm 3 , of a flowability expressed by the time taken for a quantity of granules weighing 250 g to pass through the 16 mm diameter orifice of a short stemmed analysis funnel not exceeding 10 seconds, and of an abrasion index not exceeding 10%, as determined by the method described in the standard ISO/TC 47/WG11 (secretariat-86) 167 of British Standards Institution.
References Cited (Backward Citations)
GB911640A
Cited
US3131995A
Cited
US3623836A
Cited
US3917663A
Cited
US4002434A
Cited
US3914380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |