US4777322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Obtaining but-2-enes from C4 -hydrocarbon mixtures which contain but-1-ene and may or may not contain but-2-enes
Assignee: BASF SE
•
Filing: 1985-07-26
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Granted: 1988-10-11
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Expires: 2005-07-26
Abstract
Abstract But-2-enes are obtained from C 4 -hydrocarbon mixtures which contain but-1-ene and may or may not contain but-2-enes by catalytic isomerization of the but-1-ene to but-2-enes in an isomerization zone at elevated temperatures by a process in which the isomerization is carried out in combination with a distillative separation zone, the said hydrocarbon mixture being fed to the isomerization zone and/or distillative separation zone, the isomerization mixture obtained from the isomerization zone is passed into the distillative separation zone, a but-1-ene-containing fraction is removed above the lower third of the distillative separation zone and passed into the isomerization zone, and the but-2-enes or a fraction containing these are or is removed in the lower third of the distillative separation zone.
Inventors
- 👤 Wolfgang Hoelderich
- 👤 Alfred Lindner
- 👤 Wolf D. Mross
- 👤 Max Strohmeyer
- 👤 Klaus Volkamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:03
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/08; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2518; C07C5/2525; C07C5/2537; C07C5/2556; C07C7/00; C07C7/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
A process for obtaining butenes-2 from a C 4 -hydrocarbon mixture which contains butene-1 and n-butane and may or may not contain butenes-2, comprising (a) feeding the starting C 4 -hydrocarbon mixture to the isomerization zone and/or distillative separation zone; (b) isomerizing the butene-1 in an isomerization zone in the presence of an acidic catalyst at from 100° to 350° C.; (c) passing the isomerization mixture obtained from the isomerization zone into a distillation separation zone; (d) removing a butene-1-containing fraction which additionally contains trans-butene-2 above the lower third of the distillative separation zone, and passing it to the isomerization zone; (e) removing at the same time an n-butane-containing fraction from the distillative separation section at a point above the lower third of the distillative separation zone; and (f) removing the butenes-2 or a fraction containing these in the lower third of the distillative separation zone.
Claim 2
Dependent Claim
146 words
A process for obtaining butenes-2 from a C 4 -hydrocarbon mixture which contains butene-1 and n-butane and may or may not contain butenes-2, comprising (a) feeding the starting C 4 -hydrocarbon mixture to the isomerization zone and/or distillative separation zone; (b) isomerizing the butene-1 in an isomerization zone in the presence of an acidic catalyst at from 100° to 350° C.; (c) passing the isomerization mixture obtained from the isomerization zone into a distillation separation zone; (d) removing a butene-1-containing fraction which additionally contains trans-butene-2 above the lower third of the distillative separation zone, and passing it to the isomerization zone; (e) removing at the same time an n-butane-containing fraction from the distillative separation section at a point above the lower third of the distillative separation zone; and (f) removing the butenes-2 or a fraction containing these in the lower third of the distillative separation zone.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, wherein an acidic catalyst is employed for the isomerization.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1, wherein phosphoric acids and/or phosphates-containing catalysts are used.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1, wherein the catalyst used is one which contains a zeolite of the pentasil type.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1, wherein a catalyst containing an aluminosilicate zeolite is used.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 1, wherein a catalyst containing a borosilicate zeolite is used.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1, wherein a catalyst containing an iron silicate zeolite is used.
Claim 9
Dependent Claim
18 words
A process as claimed in claim 1, wherein the catalyst used is a zeolite doped with transition metals.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 1, wherein the catalyst used is a zeolite doped with noble metals.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 1, wherein a catalyst doped with rare earth metals is used.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 9, wherein a palladium-doped zeolite is used as the catalyst.
Claim 13
Dependent Claim
18 words
A process as claimed in claim 1, wherein the isomerization is carried out in the presence of hydrogen.
Claim 14
Dependent Claim
44 words
A process as claimed in claim 1, wherein the amount of transbutene-2 recycled to the isomerization zone in step (d) is such that the weight ratio of trans-butene-2 recycled to the isomerization zone to n-butane removed in step (d) is from 100:1 to 1:100.
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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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |