US3849299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibiting the coke forming tendency of sorbents
Assignee: BP PLC
•
Filing: 1972-12-06
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Granted: 1974-11-19
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Expires: 1992-12-06
Abstract
Abstract In catalysis or sorption processes using a zeolite as a single refractory oxide of a Gp II, III or IV element, the catalyst or sorbent is treated with an atmosphere of hydrogen at at least 300*C, preferably at least 350*C after exposure to an oxygencontaining gas and before use or re-use. It has been found that oxygen is strongly held on the catalyst or sorbent and contributes to the formation of coke unless removed. A severe treatment is necessary to remove it. The process is particularly suitable for 5A zeolite sorbents used in n-paraffin separation, the decline in capacity of the zeolite with time being halved in one experiment.
Inventors
- 👤 K Bourne
- 👤 E Davies
- 👤 R Pitkethly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:36
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3408; B01J20/02; B01J20/06; B01J20/08; C; C10; C10G; C10G25/00; C10G25/02; C10G25/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
IN A SORPTION PROCESS FOR THE SEPARATION OF HYDROCARBON MIXTURES WHEREIN SOME OF THE ADSORBED COMPOUNDS FORM COKE BY REACTING WITH OXYGEN AND IN WHICH THE SORBENT AS USED INE ZEROLITE OF SUBSTANTIALLY UNIFORM PORE SIZE AND FREE OF HYDROGENATING METALLS AND IN WHICH THE ZEROLITE SORBENT AS USED IN THE SORPTION PROCESS HAS BEEN EXPOSED BEFORE SUCH USE TO AN OXYGEN-CONTAINING GAS, THE STEP OF TREATING THE ZEOLITE SORBENT WITH AN ATMOSPHERE OF HYDROGEN IN THE ABSENCE OF THE SORPTION FEEDSTOCK AT A TEMPERATURE OF AT LEAST 300*C AFTER ITS EXPOSED TO THE OXYGEN-CONTAINING GAS TO REMOVE SUBSTANTIALLY ALL OF THE OXYGEN RETAINED ON THE EXPOSED ZEOLITE SORBENT.
Claim 2
Dependent Claim
109 words
IN A SORPTION PROCESS FOR THE SEPARATION OF HYDROCARBON MIXTURES WHEREIN SOME OF THE ADSORBED COMPOUNDS FORM COKE BY REACTING WITH OXYGEN AND IN WHICH THE SORBENT AS USED INE ZEROLITE OF SUBSTANTIALLY UNIFORM PORE SIZE AND FREE OF HYDROGENATING METALLS AND IN WHICH THE ZEROLITE SORBENT AS USED IN THE SORPTION PROCESS HAS BEEN EXPOSED BEFORE SUCH USE TO AN OXYGEN-CONTAINING GAS, THE STEP OF TREATING THE ZEOLITE SORBENT WITH AN ATMOSPHERE OF HYDROGEN IN THE ABSENCE OF THE SORPTION FEEDSTOCK AT A TEMPERATURE OF AT LEAST 300*C AFTER ITS EXPOSED TO THE OXYGEN-CONTAINING GAS TO REMOVE SUBSTANTIALLY ALL OF THE OXYGEN RETAINED ON THE EXPOSED ZEOLITE SORBENT.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein the hydrogen treatment is carried out at 350*-650*C.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1 wherein the hydrogen treatment is carried out in a flowing stream of hydrogen at 50 to 200 v/v/hr and at 1 to 2,000 psia for 0.5 to 10 hours.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1 wherein the hydrogen treatment is given after regeneration of the sorbent with an oxygen-containing gas.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 1 wherein the sorbent is a 5A zeolite used for n-paraffin separation.
Claim 7
Dependent Claim
39 words
A process as claimed in claim 5 wherein the zeolite sorbent is used at an adsorption temperature of 50* - 450*C and a pressure of 15 - 500 psia to separate n-paraffins from a hydrocarbon mixture containing C4-C21 n-paraffins.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 6 wherein the zeolite sorbent is desorbed in a isobaric and isothermal process with a lower n-paraffin having fewer carbon atoms than the adsorbed n-paraffins.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 6 wherein the zeolite sorbent is desorbed in an isothermal process by pressure reduction to a pressure of from 5 to 0.05 psia.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |