Patent US4313016A successfully refreshed from Google Patents.
US4313016A
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US
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Isobutene removal from C4 streams
Assignee: PET5O-TEX CHEMICAL Corp
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Filing: 1980-10-23
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Granted: 1982-01-26
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Expires: 2000-10-23
Abstract
Abstract The isobutene in C4 hydrocarbon streams containing from 0.5 to 5% isobutene and n-butenes is reduced preferably to a level of 0.2 mole % or less by passing the feed stream at LHSV 2.5 to 12 in liquid phase through a fixed-bed cation exchange resin catalyst in a tubular reactor with a water heat exchange medium maintained at a temperature of 50 DEG to 80 DEG C., whereby the isobutene is oligomerized and easily separated from the remaining C4's by fractionation.
Inventors
- 👤 Harold E. Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:29
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/177; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A process for removing isobutene from a feed stream comprising predominately C 4 hydrocarbons and containing isobutene and n-butene, said isobutene being present in an amount of from about 0.5 to 5 mole percent comprising: (a) contacting said feed stream in liquid phase with a fixed bed of sulfonic acid group containing cation exchange resin in a reactor at a temperature of from 50° to 80° C., said feed stream being fed at a rate of a liquid hourly space velocity from about 2.5 to 12, (b) reacting the isobutene to form oligomers thereof having number average weight of C 16 hydrocarbons or less to form a product stream comprising said C 4 hydrocarbons and oligomers and having less than 0.2 vol. % isobutene therein, and (c) removing said product stream from said reactor.
Claim 2
Dependent Claim
134 words
A process for removing isobutene from a feed stream comprising predominately C 4 hydrocarbons and containing isobutene and n-butene, said isobutene being present in an amount of from about 0.5 to 5 mole percent comprising: (a) contacting said feed stream in liquid phase with a fixed bed of sulfonic acid group containing cation exchange resin in a reactor at a temperature of from 50° to 80° C., said feed stream being fed at a rate of a liquid hourly space velocity from about 2.5 to 12, (b) reacting the isobutene to form oligomers thereof having number average weight of C 16 hydrocarbons or less to form a product stream comprising said C 4 hydrocarbons and oligomers and having less than 0.2 vol. % isobutene therein, and (c) removing said product stream from said reactor.
Claim 3
Dependent Claim
38 words
The process according to claim 1 wherein said product stream is fractionated to recover an overhead C 4 fraction having an isobutene content substantially lower than said feed stream and a bottom fraction consisting essentially of said oligomers.
Claim 4
Dependent Claim
16 words
The process according to claim 1 wherein said reactor has a heat exchange medium associated therewith.
Claim 5
Dependent Claim
25 words
The process according to claim 3 wherein said reactor comprises one or more small diameter tubes containing said catalyst surrounded by said heat exchange medium.
Claim 6
Dependent Claim
27 words
The process according to claim 1 wherein said feed stream is fed to the reactor at a pressure in the range of about 35 to 300 psig.
Claim 7
Dependent Claim
25 words
A process according to claim 1 or 2 wherein said product stream contains at least 50 mole percent of the butene-1 of said feed stream.
Claim 8
Dependent Claim
23 words
The process according to claim 6 wherein said product stream contains at least 80 mole percent of the butene-1 of said feed stream.
Claim 9
Dependent Claim
28 words
The process according to claim 1 wherein said catalyst is in the form of granular particles having a surface area of 20 to 600 square meters per grams.
Claim 10
Dependent Claim
18 words
The process according to claim 4 wherein said tubes are from 1/8 inch to 2 inches outside diameter.
Claim 11
Dependent Claim
13 words
The process according to claim 9 wherein said heat exchange medium is water.
Claim 12
Dependent Claim
18 words
The process according to claim 10 wherein the temperature is in the range of 60° to 70° C.
References Cited (Backward Citations)
US3546317A
Cited
US3531539A
Cited
US3518323A
Cited
US3823198A
Cited
US3832418A
Cited
US4065512A
Cited
US4100220A
Cited
US4242530A
Cited
US4215011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |