US4188501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of monoolefin-containing hydrocarbon stream
Assignee: Phillips Petroleum Co
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Filing: 1978-08-25
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Granted: 1980-02-12
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Expires: 1998-08-25
Abstract
Abstract Purity of hydrocarbon streams is increased by contacting with stable oxides of calcium, titanium, zinc, or zirconium prior to passage to a catalytic conversion process. In one embodiment, the stable metal oxides are preactivated by heating with vaporous hydrocarbon at an elevated temperature which is effective in extending the temperature at which metal oxides are subsequently effective for purification of hydrocarbon streams.
Inventors
- 👤 Mark R. Rycheck
- 👤 Filippo Pennella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:43
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C7/00; C07C7/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A process for the removal of catalyst poisons from hydrocarbons which comprises contacting under vapor phase conditions a monoolefin-containing hydrocarbon stream contaminated with catalyst poisons with a solid adsorbent selected from the group consisting of the stable oxides of calcium, titanium, zinc and zirconium at a temperature not exceeding about 300° C. and for a period of time sufficient to yield an olefin-containing stream substantially free of said catalyst poisons.
Claim 2
Dependent Claim
70 words
A process for the removal of catalyst poisons from hydrocarbons which comprises contacting under vapor phase conditions a monoolefin-containing hydrocarbon stream contaminated with catalyst poisons with a solid adsorbent selected from the group consisting of the stable oxides of calcium, titanium, zinc and zirconium at a temperature not exceeding about 300° C. and for a period of time sufficient to yield an olefin-containing stream substantially free of said catalyst poisons.
Claim 3
Dependent Claim
47 words
A process according to claim 1 wherein said olefin stream freed of catalyst poisons is passed directly to an olefin disproportionation process wherein said stream is contacted with a disproportionation catalyst under disproportionation conditions to produce an increased yield of higher and lower boiling disproportionated olefin products.
Claim 4
Dependent Claim
54 words
A process according to claim 1 wherein the effectiveness of said solid adsorbent for removing catalyst poisons is increased for said contacting by pretreating with vapors of said olefin-containing stream at a temperature in the range of about 200°-300° C., and allowing said heated adsorbent to cool to ambient conditions before initiating said contacting.
Claim 5
Dependent Claim
75 words
A process according to claim 1 for increasing the effectiveness of said adsorbent by heating with an inert gas at an elevated temperature, discontinuing heating with said gas and allowing said adsorbent to cool to ambient conditions, heating said cooled adsorbent with vapor of said olefin-containing stream at a temperature in the range of 200°-300° C., and discontinuing heating with said vapor and allowing said adsorbent to cool to ambient conditions before initiating said contacting.
Claim 6
Dependent Claim
29 words
A process according to claim 1 wherein said monoolefin-containing stream is propylene and the temperature of said contacting is in the range of about 150° to about 250° C.
Claim 7
Dependent Claim
44 words
A process according to claim 5 wherein the propylene stream substantially free of catalyst poisons removed from said contacting is passed directly to a disproportionation zone and therein contacted with a disproportionation catalyst under disproportionation conditions to produce increased yields of ethylene and butene.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein the temperature of said contacting is in the range of about 100° to about 300° C.
Claim 9
Dependent Claim
71 words
A process according to claim 1 wherein said monoolefin-containing stream is polymerization grade propylene, the temperature of said contacting is in the range of about 100° to about 300° C., and the propylene stream substantially free of catalyst poisons removed from said contacting is passed directly to a disproportionation zone and therein contacted with a disproportionation catalyst comprising tungsten oxide-silica under reaction conditions which produce increased yields of ethylene and butenes.
Claim 10
Dependent Claim
19 words
A process according to claim 1 wherein said hydrocarbon stream consists essentially of a mixture of monoolefins and paraffins.
Claim 11
Dependent Claim
34 words
A process according to claim 3 wherein said adsorbent is activated by heating with air at a temperature in the range of about 450°-550° C. to dry said adsorbent prior to said pretreating step.
References Cited (Backward Citations)
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Cited
US2413871A
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US3660506A
Cited
US3784676A
Cited
US3883566A
Cited
US3998902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |