US3914277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon recovery process
Assignee: Johnson Matthey Davy Technologies Ltd
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Filing: 1972-03-16
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Granted: 1975-10-21
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Expires: 1992-03-16
Abstract
Abstract Unconverted hydrocarbon, for example propane, in a gaseous mixture from a hydrocarbon oxidation reaction is absorbed in a liquid absorbent and recovered by stripping the absorbent with nitrogen or a mixture of nitrogen and oxygen. The recovered hydrocarbon in admixture with the stripping gas is then recycled to the reaction.
Inventors
- 👤 William Laurence Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
151 words
IN A PROCESS FOR THE AMMOXIDATION OF PROPANE OR ISOBUTANE IN WHICH THE EFFLUENT FRON THE REACTION CONTAINS UREACTED PROPANE OR ISOBUTANE, CARBON OXIDES, NITROGEN, AND ACRYLONITREILE OR METHACRYLONITRLE AS DESIRED PRODUCT, IN WHICH SAID DESIRED PRODUCT IS REMOVED FROM THE REACTION EFFLUENT, AND WHICH UNREACTED PROPANE OR ISOBUTANE IS SEPARATED FROM CARBON OXIDES AND NITROGEN IN THE REACTION EFFLUENT AND RECYCLED TO THE REACTION THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID REACTION EFFLUENT FROM WHICH SAID DESIRED PRODUCT HAS BEEN REMOVED WITH LIQUID ABSORBDENT TO ABSORBUNREACTED PROPANE OR ISOBUTANE AND NONE OR ONLY A MINOR PORTION OF SAID CARBON OXIDES AND NITROGEN, CONTACTING RESULTING LIQUID ABSORBENT CONTAINING PROPANE OR ISOBUTANE WITH NITROGEN OR MIXTURE OF OXYGEN AND NITROGEN AS A STRIPPING GAS TO STRIP PROPANE OR ISOBUTANE FROM SAID LIQUID ABSORBENT AND OBTAIN A GASEOUS EFFLUENT CONTAINING PROPANE OR ISOBUTANE AND TRIPPING GS, AND PASSING SAID GASEOUS EFFLUENT TO SAID REACTION.
Claim 2
Dependent Claim
151 words
IN A PROCESS FOR THE AMMOXIDATION OF PROPANE OR ISOBUTANE IN WHICH THE EFFLUENT FRON THE REACTION CONTAINS UREACTED PROPANE OR ISOBUTANE, CARBON OXIDES, NITROGEN, AND ACRYLONITREILE OR METHACRYLONITRLE AS DESIRED PRODUCT, IN WHICH SAID DESIRED PRODUCT IS REMOVED FROM THE REACTION EFFLUENT, AND WHICH UNREACTED PROPANE OR ISOBUTANE IS SEPARATED FROM CARBON OXIDES AND NITROGEN IN THE REACTION EFFLUENT AND RECYCLED TO THE REACTION THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID REACTION EFFLUENT FROM WHICH SAID DESIRED PRODUCT HAS BEEN REMOVED WITH LIQUID ABSORBDENT TO ABSORBUNREACTED PROPANE OR ISOBUTANE AND NONE OR ONLY A MINOR PORTION OF SAID CARBON OXIDES AND NITROGEN, CONTACTING RESULTING LIQUID ABSORBENT CONTAINING PROPANE OR ISOBUTANE WITH NITROGEN OR MIXTURE OF OXYGEN AND NITROGEN AS A STRIPPING GAS TO STRIP PROPANE OR ISOBUTANE FROM SAID LIQUID ABSORBENT AND OBTAIN A GASEOUS EFFLUENT CONTAINING PROPANE OR ISOBUTANE AND TRIPPING GS, AND PASSING SAID GASEOUS EFFLUENT TO SAID REACTION.
Claim 3
Dependent Claim
26 words
A process according to claim 1 in which the stripping gas is a mixture of nitrogen and oxygen containing at least 30 percent nitrogen by volume.
Claim 4
Dependent Claim
26 words
A process according to claim 2 in which the stripping gas is a mixture of nitrogen and oxygen containing at least 50 percent nitrogen by volume.
Claim 5
Dependent Claim
13 words
A process according to claim 3 in which the stripping gas is air.
Claim 6
Dependent Claim
21 words
A process according to claim 2 in which the absorbent liquid is a paraffinic oil containing 10 to 17 carbon atoms.
Claim 7
Dependent Claim
25 words
A process according to claim 5 in which the liquid absorbent is an oil selected from the group kerosene, heavy naphtha, and light gas oil.
Claim 8
Dependent Claim
29 words
A process according to claim 2 in which all of the gas from which desired product is removed is treated for said absorption and recovery of propane or isobutane.
Claim 9
Dependent Claim
31 words
A process according to claim 2 in which only a portion of the gas from which desired product is removed is treated for said absorption and recovery of propane or isobutane.
Claim 10
Dependent Claim
26 words
A process according to claim 2 in which the partial pressure of the propane or isobutanE in the ammoxidation reaction is at least 0.20 atmosphere absolute.
Claim 11
Dependent Claim
18 words
A process according to claim 9 in which the said partial pressure is at least 0.35 atmosphere absolute.
Claim 12
Dependent Claim
18 words
A process according to claim 10 in which the said partial pressure is at least 0.70 atmosphere absolute.
Claim 13
Dependent Claim
13 words
A process according to claim 10 in which the acyclic hydrocarbon is propane.
Claim 14
Dependent Claim
22 words
A process according to claim 10 in which the reaction is carried out at a pressure of 1 to 5 atmospheres absolute.
Claim 15
Dependent Claim
32 words
A process according to claim 2 in which the stripping is carried out in a stripping column operated under a pressure of 0.10 to 20 psi above the pressure of the reaction.
Claim 16
Dependent Claim
27 words
A process according to claim 14 in which the stripping column is operated under a pressure of less than 5 psi above the pressure of the reaction.
Claim 17
Dependent Claim
36 words
A process according to claim 2 in which the absorption is carried out in an absorption column which is operated at a pressure which is three to four times higher than the pressure of the reaction.
Claim 18
Dependent Claim
22 words
A process according to claim 14 in which the ratio of absorption column pressure to stripping column pressure is 2.5:1 to 4:1.
References Cited (Backward Citations)
US3594987A
Cited
US3686267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |