Patent US3888017A successfully refreshed from Google Patents.
US3888017A
Expired / Lapsed
US
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Method for preparation of fine particle size inorganic oxidizers
Assignee: Hercules LLC
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Filing: 1974-03-25
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Granted: 1975-06-10
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Expires: 1994-03-25
Abstract
Abstract Inorganic oxidizers are prepared in the form of minute particles by a process in which an aqueous solution of the oxidizer is centrifugally dispersed by the action of a disc spinning at a high velocity. The aqueous solution of oxidizer is dispersed as tiny droplets having a high radial velocity. The droplets are quenched by a cold liquid at temperatures of about -20*C., at which temperature the inorganic oxidizers crystallize from solution. The resulting mixture of oxidizer particles, water and quenching liquid is freeze dried to remove water and quenching liquid from the tiny oxidizer particles by sublimation.
Inventors
- 👤 David A Mcbride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:58
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; F26B5/065; C; C06; C06B; C06B21/00; C06B21/0091
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
175 words
A PROCESS FOR PREPARATION OF FINE PARTICLE SIZE INORGANIC OXIDIZERS COMPRISING: A. FORMING AN AQUEOUS SOLUTION OF AN INORGANIC OXIDIZER SELECTED FROM THE GROUP CONSISTING OF AMMONIUM PERCHLORATE, SODIUM PERCHLORATE, POTASSIUM PERCHLORATE, AMMONIUM, NITRATE, SODIUM NITRATE AND POTASSIUM NITRATE, B. CENTRIFUGALLY DISPERSING SAID SOLUTION INTO A SPRAY OF FINE DROPLETS HAVING A HIGH RADICAL VELOCITY, C. FORMING A FILM OF QUENCHING LIQUID, SAID QUENCHING LIQUID BEING A NONSOLVENT FOR THE INORGANIC OXIDIZER IN SOLUTION, SAID QUENCHING LIQUID BEING AT A TEMPERATURE AT WHICH CRYSTALLIZATION OF THE FINE DROPLETS OF INORGANIC OXIDIZER SOLUTION WILL OCCUR SUBSTANTIALLY INSTANTANEOUSLY UPON PENETRATION OF SAID FILM BY SAID DROPLETS, D. IMPINGING THE FINE DROPLETS OF STEP (B) ON THE FILM OF QUENCHING LIQUID AT A VELOCITY SUFFICIENT FOR THE DROPLETS TO PENETRATE THE SURFACE OF THE QUENCHING LIQUID WHEREBY THE INORGANIC OXIDIZER CRYSTALLIZES FROM SAID DROPLETS FORMING THE FINE INORGANIC OXIDIZER PARTICLES, E. SUBLIMING WATER AND QUENCHING LIQUID FROM THE CRYSTALLIZED INORGANIC OXIDIZER PARTICLES, AND F. RECOVERING INORGANIC OXIDIZERS HAVING A WEIGHT MEDIUM DIAMETER OF LESS THAN ABOUT ONE MICRON.
Claim 2
Dependent Claim
175 words
A PROCESS FOR PREPARATION OF FINE PARTICLE SIZE INORGANIC OXIDIZERS COMPRISING: A. FORMING AN AQUEOUS SOLUTION OF AN INORGANIC OXIDIZER SELECTED FROM THE GROUP CONSISTING OF AMMONIUM PERCHLORATE, SODIUM PERCHLORATE, POTASSIUM PERCHLORATE, AMMONIUM, NITRATE, SODIUM NITRATE AND POTASSIUM NITRATE, B. CENTRIFUGALLY DISPERSING SAID SOLUTION INTO A SPRAY OF FINE DROPLETS HAVING A HIGH RADICAL VELOCITY, C. FORMING A FILM OF QUENCHING LIQUID, SAID QUENCHING LIQUID BEING A NONSOLVENT FOR THE INORGANIC OXIDIZER IN SOLUTION, SAID QUENCHING LIQUID BEING AT A TEMPERATURE AT WHICH CRYSTALLIZATION OF THE FINE DROPLETS OF INORGANIC OXIDIZER SOLUTION WILL OCCUR SUBSTANTIALLY INSTANTANEOUSLY UPON PENETRATION OF SAID FILM BY SAID DROPLETS, D. IMPINGING THE FINE DROPLETS OF STEP (B) ON THE FILM OF QUENCHING LIQUID AT A VELOCITY SUFFICIENT FOR THE DROPLETS TO PENETRATE THE SURFACE OF THE QUENCHING LIQUID WHEREBY THE INORGANIC OXIDIZER CRYSTALLIZES FROM SAID DROPLETS FORMING THE FINE INORGANIC OXIDIZER PARTICLES, E. SUBLIMING WATER AND QUENCHING LIQUID FROM THE CRYSTALLIZED INORGANIC OXIDIZER PARTICLES, AND F. RECOVERING INORGANIC OXIDIZERS HAVING A WEIGHT MEDIUM DIAMETER OF LESS THAN ABOUT ONE MICRON.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which the quenching liquid is maintained at a temperature of below about -20*C.
Claim 4
Dependent Claim
31 words
The process of claim 2 in which the inorganic oxidizer solution comprises, by weight, from about 85% to about 95% of water and from about 15% to about 5% inorganic oxidizer.
Claim 5
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is ammonium perchlorate.
Claim 6
Dependent Claim
13 words
The process of claim 4 in which the quenching liquid is liquid nitrogen.
Claim 7
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is sodium perchlorate.
Claim 8
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is potassium perchlorate.
Claim 9
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is ammonium nitrate.
Claim 10
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is sodium nitrate.
Claim 11
Dependent Claim
13 words
The process of claim 2 in which the inorganic oxidizer is potassium nitrate.
Claim 12
Dependent Claim
41 words
The process of claim 1 in which the spray of fine droplets of high radial velocity is formed by centrifugally dispersing the oxidizer solution from the surface of a disc spinning at a rate of at least 4,000 revolutions per minute.
Claim 13
Dependent Claim
43 words
The process of claim 1 in which the spray of fine droplets of high radial velocity is formed by centrifugally dispersing the oxidizer solution from the surface of a cup shaped member spinning at a rate of at least 4,000 revolutions per minute.
References Cited (Backward Citations)
US3228838A
Cited
US3755530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |