Patent US3878293A successfully refreshed from Google Patents.
US3878293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of finely powdered aluminum trichloride of uniform particle size
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1973-06-12
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Granted: 1975-04-15
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Expires: 1993-06-12
Abstract
Abstract Process for the production of aluminum trichloride from aluminium trichloride vapour which essentially comprises contacting in a sublimate precipitator the hot stream of aluminium trichloride vapour or a hot stream of aluminium trichloride vapour mixed with other gases with a cold stream of an inert gas under conditions that lead to solidification of aluminium trichloride and recovering the solidified aluminum trichloride from the gaseous products. In this process finely powdered aluminium trichloride having a uniform particle size is obtained.
Inventors
- 👤 Luigi Piccolo
- 👤 Antonio Paolinelli
- 👤 Marcello Ghirga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:12
CPC Classifications
C; C01; C01G; C01G1/00; C01G1/06; C01F; C01F7/00; C01F7/48; C01F7/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
PROCESS FOR THE PRODUCTION OF FINELY POWDERED ALUMINUM TRICHLORIDE OF UNIFORM PARTICLE SIZE OF AT MOST ABOUT 1 MICRON AND HAVING A BULK DENSITY OF 0.35 TO 0.55 KG/DM3 FROM ALUMINUM TRICHLORIDE VAPOUR, CHARACTERIZED IN THAT A. A GAS STREAM COMPRISING ALUMINUM TRICHLORIDE VAPOUR WITH A VELOXITY OF AT LEAST 0.5 M/SEC, AND B. A COLD STREAM OF INERT GAS WITH A VELOCITY OF AT LEAST 2 M/SEC ARE INTRODUCED INTO A SUBLIMATE PRECIPITOR, THE RATIO OF THE ENTRY FLOW VELOCITIES OF GAS STREAM COMPRISING ALUMINUM TRICHLORIDE VAPOR: INERT GAS BEING IN THE RANGE BETWEEN 1:2 AND 1:10, THE TWO GAS STREAMS MEETING AT AN ANGLE OF 20* TO 50*, AND THE TEMPERATURE OF THE COMBINED GAS MIXTURE IS KEPT AT 30* TO 70*C TO PRODUCE SAID FINELY POWDERED ALUMINUM TRICHLORIDE AND THE SAID SOLID ALUMINUM TRICHLORIDE FORMED IS SEPARATED FROM THE GASEOUS PRODUCTS.
Claim 2
Dependent Claim
144 words
PROCESS FOR THE PRODUCTION OF FINELY POWDERED ALUMINUM TRICHLORIDE OF UNIFORM PARTICLE SIZE OF AT MOST ABOUT 1 MICRON AND HAVING A BULK DENSITY OF 0.35 TO 0.55 KG/DM3 FROM ALUMINUM TRICHLORIDE VAPOUR, CHARACTERIZED IN THAT A. A GAS STREAM COMPRISING ALUMINUM TRICHLORIDE VAPOUR WITH A VELOXITY OF AT LEAST 0.5 M/SEC, AND B. A COLD STREAM OF INERT GAS WITH A VELOCITY OF AT LEAST 2 M/SEC ARE INTRODUCED INTO A SUBLIMATE PRECIPITOR, THE RATIO OF THE ENTRY FLOW VELOCITIES OF GAS STREAM COMPRISING ALUMINUM TRICHLORIDE VAPOR: INERT GAS BEING IN THE RANGE BETWEEN 1:2 AND 1:10, THE TWO GAS STREAMS MEETING AT AN ANGLE OF 20* TO 50*, AND THE TEMPERATURE OF THE COMBINED GAS MIXTURE IS KEPT AT 30* TO 70*C TO PRODUCE SAID FINELY POWDERED ALUMINUM TRICHLORIDE AND THE SAID SOLID ALUMINUM TRICHLORIDE FORMED IS SEPARATED FROM THE GASEOUS PRODUCTS.
Claim 3
Dependent Claim
29 words
Process in accordance with claim 1, characterized in that the gas stream comprising aluminum trichloride vapour is introduced into the sublimate precipitator at a temperature of 200* to 800*C.
Claim 4
Dependent Claim
30 words
Process in accordance with claim 1, characterized in that the gas stream comprising aluminum trichloride vapour is introduced into the sublimate precipitator with a velocity of 0.5 to 7.5 m/sec.
Claim 5
Dependent Claim
26 words
Process in accordance with claim 1, characterized in that the inert gas stream is introduced into the sublimate precipitator at a temperature of 5* to 35*C.
Claim 6
Dependent Claim
27 words
Process in accordance with claim 1, characterized in that the inert gas stream is introduced into the sublimate precipitator with a velocity of 2 to 20 m/sec.
Claim 7
Dependent Claim
18 words
Process in accordance with claim 1, characterized in that air or nitrogen is used as the inert gas.
Claim 8
Dependent Claim
23 words
Process in accordance with claim 1, characterized in that the two gas streams meet with an angle of 30* to 40* between them.
Claim 9
Dependent Claim
20 words
Process in accordance with claim 3, wherein the velocity of the gas stream comprising aluminum trichloride vapor is 1-3 m/sec.
Claim 10
Dependent Claim
19 words
Process in accordance with claim 5 wherein the velocity of the inert gas stream is 3 to 9 m/sec.
Claim 11
Dependent Claim
13 words
Process in accordance with claim 6 wherein the inert gas is dry air.
References Cited (Backward Citations)
US3078145A
Cited
US3694170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |