US4235983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of olefin recycle to polymerization
Assignee: BP Corp North America Inc
•
Filing: 1978-10-04
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Granted: 1980-11-25
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Expires: 1998-10-04
Abstract
Abstract Disclosed is a process for the polymerization of olefins wherein olefinic compounds are separated from mixtures containing them with resulting improved utilization of olefinic compounds. Such olefinic compounds are separated by use of membrane separation units and can be recycled to a polymerization zone.
Inventors
- 👤 Edward F. Steigelmann
- 👤 Robert L. Yahnke
- 👤 Alistair S. Couper
- 👤 Chand Deepak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:16
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/24; B; B01; B01J; B01J19/00; B01J19/24; B01J19/2455; B01J19/2465; B01J19/2475; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00121; B01J2219/00123; B01J2219/00184
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
An improved process for the manufacture of polymer comprising passing olefinic compound into a reaction zone; polymerizing a substantial portion of the olefinic compound so as to form a reaction mixture containing polymer and olefinic compound; passing a stream comprising reaction mixture to a separation zone wherein the stream is separated into a polymer fraction and a fraction comprising a mixture of olefinic compound and saturated material; recovering polymer; passing at least a portion of the mixture comprising olefinic compound and saturated material to a membrane separator which substantially separates olefinic compound from saturated material; removing olefinic compound which has been separated in the membrane separation zone by use of saturated hydrocarbon sweep fluid; and recycling the recovered olefinic compound and sweep fluid to the reaction zone.
Claim 2
Dependent Claim
127 words
An improved process for the manufacture of polymer comprising passing olefinic compound into a reaction zone; polymerizing a substantial portion of the olefinic compound so as to form a reaction mixture containing polymer and olefinic compound; passing a stream comprising reaction mixture to a separation zone wherein the stream is separated into a polymer fraction and a fraction comprising a mixture of olefinic compound and saturated material; recovering polymer; passing at least a portion of the mixture comprising olefinic compound and saturated material to a membrane separator which substantially separates olefinic compound from saturated material; removing olefinic compound which has been separated in the membrane separation zone by use of saturated hydrocarbon sweep fluid; and recycling the recovered olefinic compound and sweep fluid to the reaction zone.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said membrane separator comprises a semipermeable membrane.
Claim 4
Dependent Claim
47 words
The process of claim 2 wherein the semipermeable membrane is used in conjunction with a liquid barrier comprising aqueous metal containing ions capable of forming soluble-reversible complexes with the olefin to be separated, and a partial pressure differential of the olefinic compound is maintained across the membrane.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said partial pressure differential is maintained by removing olefinic compound which has passed through the semipermeable membrane with a liquid sweep comprising saturated hydrocarbon.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the olefinic compound comprises an olefin containing two to about eight carbon atoms.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein the olefin comprises ethylene or propylene.
Claim 8
Dependent Claim
15 words
The process of claim 3 wherein the metal containing ions comprise silver or cuprous ions.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the saturated material comprises hydrocarbon containing about two to about eight carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |