US4059505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating hydrocarbons
Assignee: BP PLC
•
Filing: 1976-03-22
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Granted: 1977-11-22
•
Expires: 1996-03-22
Abstract
Abstract Molecular sieve pressure swing separating process is modified by stopping the feed before the end of the adsorption stage and passing a mixture richer in n-paraffins than the feed through the sieve bed. Suitable mixtures include purge effluent and desorpting effluent. This enhances the purity of the product.
Inventors
- 👤 Colin William Cartwright
- 👤 Donald Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:00
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/12; C10G25/02; C10G25/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A cyclic vapour phase process for separating n-paraffins boiling in the gasoline, kerosine or gas oil ranges from a feed mixture thereof with non-straight chain hydrocarbons by means of a bed of a 5A molecular sieve comprising: i. an adsorption stage in which the feed mixture is passed into the bed under conditions of increasing pressure and an effluent produced from which the n-paraffins have been at least partly removed, and ii. a desorption stage in which the n-paraffins are desorbed from the bed by pressure reduction wherein the feed is stopped to the adsorption stage when at least 50% of the breakthrough volume has been passed and then a mixture richer in n-paraffins than the feed is passed through the bed, while the pressure is still rising.
Claim 2
Dependent Claim
128 words
A cyclic vapour phase process for separating n-paraffins boiling in the gasoline, kerosine or gas oil ranges from a feed mixture thereof with non-straight chain hydrocarbons by means of a bed of a 5A molecular sieve comprising: i. an adsorption stage in which the feed mixture is passed into the bed under conditions of increasing pressure and an effluent produced from which the n-paraffins have been at least partly removed, and ii. a desorption stage in which the n-paraffins are desorbed from the bed by pressure reduction wherein the feed is stopped to the adsorption stage when at least 50% of the breakthrough volume has been passed and then a mixture richer in n-paraffins than the feed is passed through the bed, while the pressure is still rising.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein a purge stage effected by pressure reduction is interposed between the adsorption and desorption stages.
Claim 4
Dependent Claim
25 words
A process according to claim 1 wherein the mixture richer in n-paraffins than the feedstock is n-paraffin product obtained as effluent from the desorption stage.
Claim 5
Dependent Claim
22 words
A process according to claim 2 wherein the mixture richer in n-paraffins than the feedstock is effluent obtained from the purge stage.
Claim 6
Dependent Claim
34 words
A process according to claim 1 wherein 50-150% of the breakthrough volume of feed is passed through the bed in the adsorption stage before introduction of the mixture richer in n-paraffins than the feed.
Claim 7
Dependent Claim
34 words
A process according to claim 5 wherein 90-110% of the breakthrough volume of feed is passed through the bed in the adsorption stage before introduction of the mixture richer in n-paraffins than the feed.
Claim 8
Dependent Claim
32 words
A process according to claim 1 wherein the mixture richer in n-paraffins than the feed is passed into the bed until 20-100% of the adsorber volume has been passed into the bed.
Claim 9
Dependent Claim
20 words
A process according to claim 7 wherein the mixture is passed until 40-80% of the adsorber volume has been passed.
References Cited (Backward Citations)
US2901519A
Cited
US2912473A
Cited
US3422003A
Cited
US3244619A
Cited
US3373103A
Cited
US3428552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |