US4101598A
Expired / Lapsed
US
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Isomerization of alkyl benzenes using a nu-1 zeolite catalyst
Assignee: Imperial Chemical Industries Ltd
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Filing: 1977-08-29
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Granted: 1978-07-18
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Expires: 1997-08-29
Abstract
Abstract A process for the isomerization of xylenes using the hydrogen form of new zeolite "nu-1" having a silica to alumina ratio of 20 to 150 and a characteristic X-ray diffraction pattern and adsorption properties.
Inventors
- 👤 Thomas Vincent Whittam
- 👤 Barry Youll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; C01; C01B; C01B39/00; C01B39/02; C01B39/46; C01B39/48; C07C5/2767; C07C5/277; C07C5/2775; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A process for the isomerisation of alkyl benzenes which comprises contacting a feed of an alkyl benzene or a mixture of alkyl benzenes under isomerisation conditions in the liquid or vapour phase with a catalyst comprising zeolite nu-1 having a composition expressed by the formula 0.9 to 1.3 R.sub.2 O . Al.sub.2 O.sub.3 . 20 to 150 SiO.sub.2 . 0 to 40 H.sub.2 O where R is one or more of hydrogen, ammonium, phosphonium or 1/n of a cation having a valency n and having a X-ray diffraction pattern when R is H substantially as shown in Table 1.
Claim 2
Dependent Claim
99 words
A process for the isomerisation of alkyl benzenes which comprises contacting a feed of an alkyl benzene or a mixture of alkyl benzenes under isomerisation conditions in the liquid or vapour phase with a catalyst comprising zeolite nu-1 having a composition expressed by the formula 0.9 to 1.3 R.sub.2 O . Al.sub.2 O.sub.3 . 20 to 150 SiO.sub.2 . 0 to 40 H.sub.2 O where R is one or more of hydrogen, ammonium, phosphonium or 1/n of a cation having a valency n and having a X-ray diffraction pattern when R is H substantially as shown in Table 1.
Claim 3
Dependent Claim
47 words
A process according to claim 1 in which the reactants are present in the vapour phase, added free hydrogen is substantially absent, the temperature is in the range 200°-450° C, the pressure in the range 1 to 5 ata and the catalyst contains substantially no hydrogenation/dehydrogenation components.
Claim 4
Dependent Claim
26 words
A process according to claim 2 in which the starting materials include xylenes and ethylbenzene and the process conditions are chosen so that ethylbenzene is converted.
References Cited (Backward Citations)
US3948758A
Cited
US4060590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |