US4453029A
Expired / Lapsed
US
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Selective sorption by zeolites
Assignee: Mobil Oil AS
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Filing: 1981-09-30
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Granted: 1984-06-05
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Expires: 2001-09-30
Abstract
Abstract An improved adsorptive separation process by the selective sorption properties of certain members of a novel class of zeolites is provided. The zeolites are characterized by a silica to alumina mole ratio greater than 12 and a Constraint Index within the approximate range of greater than 2 to about 12. The process of this invention involves selective separation of aromatic compounds selected from the group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted pyridine ring compounds in admixture with aromatic compounds selected from the group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted benzene ring compounds and poly-substituted pyridine ring compounds by contacting the mixture with said zeolite to effect the selective sorption of said aromatic compounds selected from the group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted pyridine ring compounds by said zeolite.
Inventors
- 👤 Ralph M. Dessau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:48
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/02; C10G25/03; C07; C07C; C07C17/00; C07C17/38; C07C17/389; C07C37/00; C07C37/68; C07C37/70; C07C37/82; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A process for the selective separation of aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted and para-disubstituted pyridine ring compounds in admixture with aromatic compounds selected from the second group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted benzene ring compounds and ortho-disubstituted, meta-disubstituted and more highly substituted pyridine ring compounds which comprises contacting the mixture with a cesium-exchange ZSM-5 zeolite characterized by a SiO 2 /Al 2 O 3 mole ratio of at least about 12 and a Constraint Index in the approximate range of greater than 2 to about 12 to effect the selective sorption of said aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted and para-disubstituted pyridine ring compounds by said zeolite.
Claim 2
Dependent Claim
133 words
A process for the selective separation of aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted and para-disubstituted pyridine ring compounds in admixture with aromatic compounds selected from the second group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted benzene ring compounds and ortho-disubstituted, meta-disubstituted and more highly substituted pyridine ring compounds which comprises contacting the mixture with a cesium-exchange ZSM-5 zeolite characterized by a SiO 2 /Al 2 O 3 mole ratio of at least about 12 and a Constraint Index in the approximate range of greater than 2 to about 12 to effect the selective sorption of said aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted benzene ring compounds and mono-substituted and para-disubstituted pyridine ring compounds by said zeolite.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said zeolite has been calcined in an inert atmosphere.
Claim 4
Dependent Claim
35 words
The process of clam 1 wherein said substituents of said aromatic compounds are selected from the group consisting of alkyl of from 1 to 10 carbon atoms, halogen, sulfur-containing groups, oxygen-containing groups and nitrogen-containing groups.
Claim 5
Dependent Claim
35 words
The process of clam 1 wherein said substituents of said aromatic compounds are selected from the group consisting of alkyl of from 1 to 10 carbon atoms, halogen, sulfur-containing groups, oxygen-containing groups and nitrogen-containing groups.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein said substituents of said aromatic compounds are alkyl of from 1 to 10 carbon atoms.
Claim 7
Dependent Claim
40 words
The process of claim 1 wherein said first group of aromatic compounds is para-disubstituted benzene ring compounds and said second group of aromatic compounds is selected from the group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted benzene ring compounds.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein said first group of aromatic compounds is para-xylene and said second group of aromatic compounds is selected from the group consisting of ortho-xylene and meta-xylene.
Claim 9
Dependent Claim
13 words
The process of claim 1 conducted at a temperature below about 150° C.
Claim 10
Dependent Claim
87 words
A process for selective separation of aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted pyridine ring compounds in admixture with compounds selected from the second group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted pyridine ring compounds which comprises contacting the mixture with a zeolite characterized by a SiO 2 /Al 2 O 3 mole ratio of at least about 12 and a Constraint Index in the approximate range of greater than 2 to about 12 to effect selective sorption by said zeolite.
Claim 11
Dependent Claim
87 words
A process for selective separation of aromatic compounds selected from the first group consisting of mono-substituted and para-disubstituted pyridine ring compounds in admixture with compounds selected from the second group consisting of ortho-disubstituted, meta-disubstituted and more highly substituted pyridine ring compounds which comprises contacting the mixture with a zeolite characterized by a SiO 2 /Al 2 O 3 mole ratio of at least about 12 and a Constraint Index in the approximate range of greater than 2 to about 12 to effect selective sorption by said zeolite.
Claim 12
Dependent Claim
35 words
The process of claim 8 wherein said zeolite has had its original cations replaced, at least in part, by ion exchange with a cation selected from the group consisting of tetramethylammonium and rare earth metal.
Claim 13
Dependent Claim
21 words
The process of claim 8 wherein said zeolite consists essentially of HZSM-5 having a crystal size greater than about 0.5 micron.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |