US4404118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of adsorbents by low temperature hydrogen stripping
Assignee: Honeywell UOP LLC
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Filing: 1981-12-28
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Granted: 1983-09-13
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Expires: 2001-12-28
Abstract
Abstract A method is disclosed for regenerating a solid adsorbent which has been used to remove oxygen-containing hydrocarbonaceous compounds, water or sulfur-containing compounds from a hydrocarbon stream. The method is preferably applied to molecular sieves which have been used to remove ethers, alcohols and/or water from a light liquid phase hydrocarbon stream such as a stream which is rich in C 4 hydrocarbons. The regeneration method includes stripping the adsorbent with a low temperature hydrogen-rich gas stream, which preferably has a temperature below about 200° F., and then gradually increasing the temperature of the gas stream to customary regeneration temperatures.
Inventors
- 👤 Lily E. Herskovits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:32
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/12; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J20/10; B01J20/16; B01J20/18; B01J20/30; B01J20/34; B01J20/3408; B01J20/3433; B01J20/345; B01J20/3458; B01J20/3483
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A method of regenerating a solid adsorbent containing oxygenated hydrocarbonaceous impurities, said impurities being existent as a result of treating a process stream comprising a hydrocarbon having less than 12 carbon atoms per molecule with said adsorbent which comprises: (a) contacting said solid adsorbent with a hydrogen-rich stream for at least one hour at a low temperature below about 200° F. to hydrogenate at least a portion of said oxygenated hydrocarbonaceous impurities at said low temperature; and then (b) increasing said low temperature to a high temperature above 400° F. at a uniform rate less than 50° F. per hour to complete regeneration of said solid adsorbent without loss of adsorption capacity.
Claim 2
Independent Claim
112 words
A method of regenerating a solid adsorbent containing oxygenated hydrocarbonaceous impurities, said impurities being existent as a result of treating a process stream comprising a hydrocarbon having less than 12 carbon atoms per molecule with said adsorbent which comprises: (a) contacting said solid adsorbent with a hydrogen-rich stream for at least one hour at a low temperature below about 200° F. to hydrogenate at least a portion of said oxygenated hydrocarbonaceous impurities at said low temperature; and then (b) increasing said low temperature to a high temperature above 400° F. at a uniform rate less than 50° F. per hour to complete regeneration of said solid adsorbent without loss of adsorption capacity.
Claim 3
Dependent Claim
28 words
The method of claim 1 further characterized in that the average temperature of the adsorbent before being contacted with the hydrogen-rich gas stream is less than 200° F.
Claim 4
Dependent Claim
14 words
The method of claim 2 further characterized in that the adsorbent comprises an alumina.
Claim 5
Dependent Claim
15 words
The method of claim 2 further characterized in that the adsorbent comprises a zeolitic material.
Claim 6
Dependent Claim
21 words
The method of claim 4 further characterized in that the adsorbent is a type 5A or a type 13X molecular sieve.
Claim 7
Dependent Claim
25 words
The method of claim 1 further characterized in that the process stream comprises olefinic and diolefinic hydrocarbons having less than 6 carbon atoms per molecule.
Claim 8
Dependent Claim
16 words
The method of claim 1 further characterized in that the adsorbent is a naturally occurring material.
Claim 9
Dependent Claim
15 words
The method of claim 1 further characterized in that the process stream comprises diolefinic hydrocarbons.
Claim 10
Dependent Claim
19 words
The method of claim 1 further characterized in that the process stream comprises 50 mole percent C 4 hydrocarbons.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |