Patent US3723564A successfully refreshed from Google Patents.
US3723564A
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Isomerization of butene-1 to cis-butene-2
Assignee: Texas Petrochemicals Corp
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Filing: 1969-11-24
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Granted: 1973-03-27
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Expires: 1989-11-24
Abstract
Abstract Butene-1 is isomerized principally to cis-butene-2 by contacting butene-1 in liquid phase with a molecular sieve having an effective pore size of greater than 5 and less than 10 A. at e.g. 100*C. Prior to use the molecular sieve was activated at a temperature of 400*-450*C. in a stream of nitrogen and 3 percent oxygen. Conversion to butene-2 was 32 mole percent of which 51.3 percent was the cis form. The cis-butene-2 is a useful feed for oxidative dehydrogenation to butadiene.
Inventors
- 👤 C Tidwell
- 👤 V Henneberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:59
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; C; C07; C07C; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2518; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
The process according to claim 1 wherein the activation is at a temperature in the range of 320* - 500*C.
Claim 2
Dependent Claim
24 words
The process according to claim 2 wherein the activation is carried out in a non-reactive gas of air, nitrogen, helium, argon or mixtures thereof.
Claim 3
Dependent Claim
22 words
The process according to claim 3 wherein the contacting is carried out at a temperature in the range of 50* to 150*C.
Claim 4
Dependent Claim
18 words
The process according to claim 4 wherein the pressure is sufficient to maintain the butene-1 in liquid phase.
Claim 5
Dependent Claim
19 words
The process according to claim 5 wherein the pressure is in the range of over 1 to 50 atmospheres.
Claim 6
Dependent Claim
13 words
The process according to claim 1 wherein the molecular sieve is type X.
Claim 7
Dependent Claim
35 words
The process according to claim 7 wherein the feed comprises 40 to 60 mole percent butene-1, 6 to 10 mole percent n-butane, 0 to 4 mole percent isobutylene and 30 to 50 mole percent butene-2.
Claim 8
Dependent Claim
43 words
The process according to claim 1 wherein the process is cyclic comprising alternating regenerating and contacting cycles, provided that the regenerating cycle is carried out at a temperature of at least 400*C. up to the temperature at which the molecular sieve is deactivated.
Claim 9
Dependent Claim
18 words
The process according to claim 9 wherein the regeneration temperature is in the range of 400* to 600*C.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |