Patent DE834016C successfully refreshed from Google Patents.
Patent US4000059A successfully refreshed from Google Patents.
US4000059A
Expired / Lapsed
US
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Hydrocarbon separation process
Assignee: BP PLC
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Filing: 1975-03-14
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Granted: 1976-12-28
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Expires: 1995-03-14
Abstract
Abstract In a 5A molecular sieve separation process for the production of n-paraffins the amount of feed required to produce a given amount of n-paraffins is reduced by recycling all of the effluent from the adsorber for a certain period during the adsorption stage.
Inventors
- 👤 Gordon James Wanless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/02; C10G25/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 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 at a temperature in the range 300° to 450° C. by means of a bed of 5A molecular sieve which process comprises i. an adsorption stage in which the feed mixture is passed into the bed to produce an effluent from the bed from which the n-paraffins have been at least partly removed, and recycling all of the effluent from the adsorption stage for a certain period of time during the adsorption stage, said period commencing when at least 70% of the total feed mixture has been passed into the bed and ending when not more than 140% of the total feed mixture has been passed into the bed; ii. a desorption stage which comprises desorbing the n-paraffins from the bed.
Claim 2
Dependent Claim
148 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 at a temperature in the range 300° to 450° C. by means of a bed of 5A molecular sieve which process comprises i. an adsorption stage in which the feed mixture is passed into the bed to produce an effluent from the bed from which the n-paraffins have been at least partly removed, and recycling all of the effluent from the adsorption stage for a certain period of time during the adsorption stage, said period commencing when at least 70% of the total feed mixture has been passed into the bed and ending when not more than 140% of the total feed mixture has been passed into the bed; ii. a desorption stage which comprises desorbing the n-paraffins from the bed.
Claim 3
Dependent Claim
31 words
A cyclic vapour phase process as claimed in claim 1 wherein the recycle is commenced when from 80 to 100% of the total feed mixture has been passed into the bed.
Claim 4
Dependent Claim
27 words
A cyclic vapour phase process as claimed in claim 1 wherein when the recycle has been commenced it is continued until the end of the adsorption stage.
Claim 5
Dependent Claim
28 words
A cyclic vapour phase process as claimed in claim 1 wherein the recycled effluent is passed to the feed mixture in a reservoir and allowed to blend therewith.
Claim 6
Dependent Claim
47 words
A cyclic vapour phase process as claimed in claim 1 wherein when the feed mixture is a kerosine or gas oil, at least part of the first 20% of the effluent from the bed after the commencement of the adsorption stage is recycled to the feed mixture.
Claim 7
Dependent Claim
27 words
A cyclic vapour phase process as claimed in claim 5 wherein at least part of the first 10% of the effluent is recycled to the feed mixture.
Claim 8
Dependent Claim
54 words
A cyclic vapour process as claimed in claim 6 in which desorption is effected by pressure reduction and at the commencement of the adsorption stage the bed is pressurised up to a pressure which is maintained for the remainder of the stage and the recycle is started at the end of the pressuring up.
References Cited (Backward Citations)
US3227647A
Cited
US3753895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |