Patent US4426292A successfully refreshed from Google Patents.
US4426292A
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Process for selective separation of molecular species from mixtures thereof using cyclodextrins
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-02-19
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Granted: 1984-01-17
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Expires: 2002-02-19
Abstract
Abstract A mixture of two or more fluid molecular species is resolved into its compartment parts by a selective separation process whereby the mixture is contacted with a solid particulate monomeric cyclodextrin. On contact, at least one of the molecular species is selectively sorbed onto the cyclodextrin, and thereafter the species is desorbed from the cyclodextrin. In a preferred aspect, the species to be separated are organic compounds.
Inventors
- 👤 David L. Wernick
- 👤 Stephen Scypinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:42
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D53/00; B01D53/02; B01D53/025; B01J; B01J20/00; B01J20/22; B01J20/24; B01J20/281; B01J20/282; B01J20/285; B01J20/30; B01J20/34; B01J20/3425; B01J20/3491; C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0012; C10; C10G; C10G25/00; C10G25/003; G; G01; G01N; G01N30/00; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
61 words
In a process for selectively separating two or more fluid molecular species from a mixture of the same wherein at least one molecular species is sorbed on a sorbent and the sorbed molecular species is then desorbed, thereby partially or fully regenerating the sorbent, the improvement which comprises employing as the sorbent an underivatized crystalline monomeric cyclodextrin containing 6-8 glucose units.
Claim 2
Dependent Claim
61 words
In a process for selectively separating two or more fluid molecular species from a mixture of the same wherein at least one molecular species is sorbed on a sorbent and the sorbed molecular species is then desorbed, thereby partially or fully regenerating the sorbent, the improvement which comprises employing as the sorbent an underivatized crystalline monomeric cyclodextrin containing 6-8 glucose units.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said molecular species are selected from the group consisting of organic compounds, inert gases, inorganic compounds, organometallic compounds, and mixtures thereof.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said molecular species are organic compounds.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein said molecular species are linear or branched alkanes, cycloalkanes, alkenes, dienes or benzenes.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said cyclodextrin has a cage lattice.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein said cyclodextrin contains complexed molecular species other than those in the mixture to be separated.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said complexed species is water.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein said cyclodextrin is free of complexed molecular species other than those in the mixture to be separated.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said cyclodextrin is dried before contacting said mixture therewith.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein said cyclodextrin is crystallized in a well-ordered lattice form.
Claim 12
Dependent Claim
31 words
The process of claim 1 wherein said cyclodextrin is crystallized in an ordered lattice form, dried, and passed through a sieve to reduce its particle size before contacting said mixture therewith.
Claim 13
Dependent Claim
17 words
The process of claim 1 wherein said sorption step is carried out in the absence of water.
Claim 14
Dependent Claim
25 words
The process of claim 1 wherein said sorption step is carried out in the presence of water at a concentration insufficient to dissolve the cyclodextrin.
Claim 15
Dependent Claim
42 words
The process of claim 1 wherein said desorption step takes place by reducing the partial pressure of the sorbed species, by increasing the temperature, by adding a desorbent species which displaces the sorbed molecular species, or by any combination of these techniques.
Claim 16
Dependent Claim
16 words
The process of claim 1 wherein said steps take place by chromatography or packed bed sorption.
Claim 17
Dependent Claim
13 words
The process of claim 1 wherein said steps take place by gas chromatography.
Claim 18
Dependent Claim
20 words
The process of claim 16 wherein said steps take place at a temperature of no greater than about 175° C.
Claim 19
Dependent Claim
72 words
A process for selectively separating two or more molecular species selected from the group consisting of linear or branched alkanes, cycloalkanes, alkenes, dienes and benzenes from mixtures thereof comprising (1) contacting said mixture with a dried and sieved underivatized crystalline monomeric cyclodextrin containing 6-8 glucose units, (2) sorbing at least one molecular species on said crystalline cyclodextrin, and (3) desorbing said sorbed molecular species, thereby partially or fully regenerating the crystalline cyclodextrin.
Claim 20
Dependent Claim
72 words
A process for selectively separating two or more molecular species selected from the group consisting of linear or branched alkanes, cycloalkanes, alkenes, dienes and benzenes from mixtures thereof comprising (1) contacting said mixture with a dried and sieved underivatized crystalline monomeric cyclodextrin containing 6-8 glucose units, (2) sorbing at least one molecular species on said crystalline cyclodextrin, and (3) desorbing said sorbed molecular species, thereby partially or fully regenerating the crystalline cyclodextrin.
Claim 21
Dependent Claim
25 words
The process of claims 1 or 18 wherein the regenerated cyclodextrin from the desorbing step is recycled for reuse in the contacting and sorbing steps.
References Cited (Backward Citations)
US3472835A
Cited
GB2030574B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |