US3832416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of cyclopentadiene from hydrocarbon mixtures
Assignee: Shell USA Inc
•
Filing: 1973-07-16
•
Granted: 1974-08-27
•
Expires: 1993-07-16
Abstract
Abstract A process for the removal of cyclopentadiene from a hydrocarbon mixture containing isoprene comprising contacting said hydrocarbon mixture with dehydrated molecular sieve material containing at least one alkali metal and having a pore diameter of more than 0.6 nanometers (nm).
Inventors
- 👤 Grinsven P Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:31
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
A process as in claim 1 wherein the molecular sieve material contains only alkali metals in addition to aluminum.
Claim 2
Dependent Claim
15 words
A process as in claim 1 wherein the molecular sieve material is loaded with cesium.
Claim 3
Dependent Claim
37 words
A process as in claim 3, wherein the molecular sieve material is loaded with cesium to an extent of at least 25 atomic percent, based on the number of aluminum atoms present in the molecular sieve material.
Claim 4
Dependent Claim
24 words
A process as in claim 1 wherein the molar ratio of SiO2 : Al2O3 in the molecular sieve material is from 2 to 6.
Claim 5
Dependent Claim
13 words
A process as in claim 1 wherein the molecular sieve material is faujasite.
Claim 6
Dependent Claim
41 words
A process as in claim 1 wherein the molecular sieve material loaded with at least one alkali metals is dehydrated by heating to temperatures between 200* and 500*C in an inert gas atmosphere for a period of 4 to 8 hours.
Claim 7
Dependent Claim
25 words
A process as in claim 1 wherein the hydrocarbon mixture is contacted with the molecular sieve material at a temperature between 0* and 100* C.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |