US4581474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon conversion process
Assignee: Phillips Petroleum Co
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Filing: 1985-03-11
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Granted: 1986-04-08
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Expires: 2005-03-11
Abstract
Abstract In a combination alkylation-methyltertiary butyl ether (MTBE) operation, the unreacted C 4 olefinic hydrocarbons produced by etherification are contacted with molecular sieves to absorb 2-butenes and the 1-butenes remaining in the stream are divided so that one portion is subjected to double bond isomerization to form 2-butenes for alkylation and another portion is subjected skeletal isomerization to form isobutene for etherification.
Inventors
- 👤 Thomas Hutson, Jr.
- 👤 Paul D. Hann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:21
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/05; C07C41/06; C07C9/00; C07C9/14; C07C9/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A combination process for producing high octane blending components for gasolines which comprises (a) contacting a mixture of methanol and an olefinic C 4 cut comprising isobutene, 1-butene, and 2-butenes under etherification conditions to produce methyltertiarybutyl ether and unreacted C 4 olefinic hydrocarbons, (b) contacting the unreacted C 4 olefinic hydrocarbons with a molecular sieve to selectively adsorb 2-butenes leaving a stream comprising 1-butene, (c) subjecting at least a portion of said 1-butene stream to skeletal isomerization to form isobutene, (d) subjecting the remainder of the 1-butene stream to double bond isomerization to form 2-butenes, and (e) passing the 2-butenes formed by isomerization and an isoparaffin to alkylation to form alkylate.
Claim 2
Dependent Claim
111 words
A combination process for producing high octane blending components for gasolines which comprises (a) contacting a mixture of methanol and an olefinic C 4 cut comprising isobutene, 1-butene, and 2-butenes under etherification conditions to produce methyltertiarybutyl ether and unreacted C 4 olefinic hydrocarbons, (b) contacting the unreacted C 4 olefinic hydrocarbons with a molecular sieve to selectively adsorb 2-butenes leaving a stream comprising 1-butene, (c) subjecting at least a portion of said 1-butene stream to skeletal isomerization to form isobutene, (d) subjecting the remainder of the 1-butene stream to double bond isomerization to form 2-butenes, and (e) passing the 2-butenes formed by isomerization and an isoparaffin to alkylation to form alkylate.
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein the 2-butenes formed in (d) are passed through a molecular sieve bed on desorption cycle to remove adsorbed 2-butenes for passing to alkylation in (e).
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein said alkylation is HF acid catalyzed and the isoparaffin is isobutane.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the isobutenes formed in (c) are passed to (a) as part of the feed.
Claim 6
Dependent Claim
51 words
A process according to claim 1 wherein the 2-butenes effluent from double bond isomerization is heated and then passed through a molecular sieve bed containing adsorbed 2-butenes under conditions to desorb 2-butenes therefrom, and passing double bond isomerization produced 2-butenes and desorbed 2-butenes and isobutane to an HF acid catalyzed alkylation.
Claim 7
Dependent Claim
25 words
A process according to claim 5 wherein isobutene produced by skeletal isomerization in (c) is recycled as part of the feed for etherification in (a).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |