US4499201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing alumina or silica substrate from carbonaceous pyropolymers
Assignee: Honeywell UOP LLC
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Filing: 1983-05-19
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Granted: 1985-02-12
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Expires: 2003-05-19
Abstract
Abstract Carbonaceous pyropolymers possessing recurring units containing at least carbon and hydrogen atoms may be obtained from compositions of matter comprising carbonaceous pyropolymers possessing recurring units containing at least carbon and hydrogen atoms composited on an inorganic metal oxide support or substrate by treating the composition of matter with a chloride-containing compound at an elevated temperature in the range of from about 400° to about 1000° C. in the vapor phase. The resulting metal chloride such as aluminum chloride is continuously removed from the composite, leaving only the carbonaceous pyropolymer.
Inventors
- 👤 Richard W. Leyerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:52
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J37/0018; B01J21/00; B01J21/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A process for the removal of alumina or silica from a composition of matter comprising a carbonaceous pyropolymer possessing recurring units containing at least carbon and hydrogen atoms composited on an alumina or silica substrate, which process comprises contacting said composition of matter at a temperature of from about 400° C. to about 1000° C. with the vapors of an organic chloride-containing compound reactable with the alumina or silica content of the substrate to form aluminum chloride or silicon chloride, removing the resultant aluminum or silicon chloride vapor, and recovering the remaining carbonaceous pyropolymer possessing recurring units containing at least carbon and hydrogen atoms.
Claim 2
Dependent Claim
104 words
A process for the removal of alumina or silica from a composition of matter comprising a carbonaceous pyropolymer possessing recurring units containing at least carbon and hydrogen atoms composited on an alumina or silica substrate, which process comprises contacting said composition of matter at a temperature of from about 400° C. to about 1000° C. with the vapors of an organic chloride-containing compound reactable with the alumina or silica content of the substrate to form aluminum chloride or silicon chloride, removing the resultant aluminum or silicon chloride vapor, and recovering the remaining carbonaceous pyropolymer possessing recurring units containing at least carbon and hydrogen atoms.
Claim 3
Dependent Claim
18 words
The process as set forth in claim 1 in which said substrate comprises a high surface area alumina.
Claim 4
Dependent Claim
17 words
The process as set forth in claim 2 in which said high surface area alumina is gamma-alumina.
Claim 5
Dependent Claim
14 words
The process as set forth in claim 1 in which said substrate comprises silica.
Claim 6
Dependent Claim
16 words
The process as set forth in claim 1 in which said organic chloride-containing compound comprises 1,1,2,2-tetrachloroethylene.
Claim 7
Dependent Claim
17 words
The process as set forth in claim 1 in which said organic chloride-containing compound comprises carbon tetrachloride.
Claim 8
Dependent Claim
16 words
The process as set forth in claim 1 in which said organic chloride-containing compound comprises phosgene.
Claim 9
Dependent Claim
16 words
The process as set forth in claim 1 in which said organic chloride-containing compound comprises chloroform.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |