US4100220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimerization of isobutene
Assignee: Texas Petrochemicals Corp
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Filing: 1977-06-27
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Granted: 1978-07-11
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Expires: 1997-06-27
Abstract
Abstract An improved process for the preparation of isobutene dimer comprising passing isobutene and a controlled amount of t-butanol and/or water (water reacts with isobutene under the conditions of the reaction to form t-butanol) through a fixed bed acidic cation exchange resin, producing only a hydrocarbon phase, removing the hydrocarbon phase, splitting the hydrocarbon phase, and recycling a portion thereof to the reaction. The recycle provides the means to control the temperature of the reaction by cooling the recycle and providing a heat sink. The controlled amount of t-butanol and/or water suppresses or inhibits the production of isobutene high polymers, e.g., trimers, tetramers and codimers (butene is also a common component of available C4 feed streams).
Inventors
- 👤 William G. Bowman
- 👤 William P. Stadig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:29
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/03; C07C29/04; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/28; C07C2531/00; C07C2531/02; C07C2531/06; C07C2531/08; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/934; Y10S585/949; Y10S585/952
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
A process for the preparation of isobutene dimer comprising passing isobutene and t-butanol, water or a mixture of t-butanol and water through a fixed bed of acidic cation exchange resin catalyst in liquid phase at a temperature in the range of 55° to 160° C for a sufficient time to react isobutene, the mol ratio of t-butanol to isobutene being in the range of 0.001 to 1.0:1 and the mol ratio of water to isobutene being less than 0.06: provided that the total amount of t-butanol including the equivalent represented by the reaction of water present with isobutene is within the mol ratio of t-butanol to isobutene range of 0.001 to 1.0:1, producing only a hydrocarbon phase, recovering said hydrocarbon phase, containing isobutene dimer, splitting said hydrocarbon phase, cooling one portion thereof to a temperature in the range of 15° to 110° C and recycling the cooled portion to the reaction.
Claim 2
Dependent Claim
151 words
A process for the preparation of isobutene dimer comprising passing isobutene and t-butanol, water or a mixture of t-butanol and water through a fixed bed of acidic cation exchange resin catalyst in liquid phase at a temperature in the range of 55° to 160° C for a sufficient time to react isobutene, the mol ratio of t-butanol to isobutene being in the range of 0.001 to 1.0:1 and the mol ratio of water to isobutene being less than 0.06: provided that the total amount of t-butanol including the equivalent represented by the reaction of water present with isobutene is within the mol ratio of t-butanol to isobutene range of 0.001 to 1.0:1, producing only a hydrocarbon phase, recovering said hydrocarbon phase, containing isobutene dimer, splitting said hydrocarbon phase, cooling one portion thereof to a temperature in the range of 15° to 110° C and recycling the cooled portion to the reaction.
Claim 3
Dependent Claim
131 words
A process for the preparation of isobutene dimer comprising: (a) feeding a stream containing isobutene and 0.001 to 1 mol of t-butanol per mol of isobutene; (b) contacting said stream with a granular fixed bed acidic cation exchange resin for a sufficient time to react isobutene at a temperature of reaction in the fixed bed in the range of 55° to 160° C; (c) producing only a hydrocarbon phase product stream containing isobutene dimer; (d) splitting the hydrocarbon phase product passing from said fixed bed into two portions; (e) recovering and removing one portion of said hydrocarbon phase product; (f) cooling one portion of said hydrocarbon phase product to a temperature in the range of 15° to 110° C; and, (g) recycling said cooled hydrocarbon phase product portion to step (a).
Claim 4
Dependent Claim
131 words
A process for the preparation of isobutene dimer comprising: (a) feeding a stream containing isobutene and 0.001 to 1 mol of t-butanol per mol of isobutene; (b) contacting said stream with a granular fixed bed acidic cation exchange resin for a sufficient time to react isobutene at a temperature of reaction in the fixed bed in the range of 55° to 160° C; (c) producing only a hydrocarbon phase product stream containing isobutene dimer; (d) splitting the hydrocarbon phase product passing from said fixed bed into two portions; (e) recovering and removing one portion of said hydrocarbon phase product; (f) cooling one portion of said hydrocarbon phase product to a temperature in the range of 15° to 110° C; and, (g) recycling said cooled hydrocarbon phase product portion to step (a).
Claim 5
Dependent Claim
20 words
The process according to claim 2 wherein the temperature in the reaction in the fixed bed is over 100° C.
Claim 6
Dependent Claim
20 words
The process according to claim 3 wherein the temperature gradient in the fixed bed is no greater than 25° C.
Claim 7
Dependent Claim
16 words
The process according to claim 2 wherein the acidic cation exchange resin contains sulfonic acid groups.
Claim 8
Dependent Claim
19 words
The process according to claim 2 wherein the resin has a granular size of about 0.15 to 1 mm.
Claim 9
Dependent Claim
19 words
The process according to claim 2 wherein said cooled hydrocarbon phase product portion is continuously recycled to step (a).
Claim 10
Dependent Claim
20 words
The process according to claim 2 wherein said isobutene is a component of a stream substantially comprising C 4 hydrocarbons.
Claim 11
Dependent Claim
19 words
The process according to claim 8 wherein said isobutene comprises 5 to 100 percent of said C 4 hydrocarbons.
Claim 12
Dependent Claim
16 words
The process according to claim 2 wherein said fixed bed is positioned in a vertical reactor.
Claim 13
Dependent Claim
31 words
The process according to claim 2 wherein the recycle hydrocarbon phase of step (g) is returned to step (a), in a volume ratio of 0.1 to 50:1, recycle:isobutene of step (a).
Claim 14
Dependent Claim
19 words
The process according to claim 2 wherein isobutene dimer is recovered from the hydrocarbon phase product of step (e).
Claim 15
Dependent Claim
25 words
The process according to claim 2 wherein up to 0.06 mol of water per mol of isobutene is added to said stream of step (a).
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |