US4376226A
Expired / Lapsed
US
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Process for the separation of ortho aromatic isomers by selective adsorption
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-02-05
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Granted: 1983-03-08
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Expires: 2002-02-05
Abstract
Abstract An improved process for separating ortho aromatic isomers from a feed stream containing a mixture of aromatics by contacting the feed stream with a bed of the crystalline aluminosilicate adsorbent CSZ-1. The adsorbed ortho aromatic isomer is removed from the adsorbent by desorption.
Inventors
- 👤 Daniel D. Rosenfeld
- 👤 David E. W. Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:21
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
86 words
An adsorptive separation process for separating the ortho aromatic isomers from a hydrocarbon feed stream containing a mixture of aromatics comprising: (a) contacting said hydrocarbon feed stream with a bed of a crystalline aluminosilicate adsorbent of CSZ-1; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho aromatic isomer of the feed stream; (c) desorbing the adsorbed ortho aromatic isomer to effect displacement thereof; and (d) withdrawing from the adsorbent bed an extract stream containing the ortho aromatic isomer.
Claim 2
Dependent Claim
86 words
An adsorptive separation process for separating the ortho aromatic isomers from a hydrocarbon feed stream containing a mixture of aromatics comprising: (a) contacting said hydrocarbon feed stream with a bed of a crystalline aluminosilicate adsorbent of CSZ-1; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho aromatic isomer of the feed stream; (c) desorbing the adsorbed ortho aromatic isomer to effect displacement thereof; and (d) withdrawing from the adsorbent bed an extract stream containing the ortho aromatic isomer.
Claim 3
Dependent Claim
36 words
Process of claim 1 further characterized in that said adsorbent contains at least one cation selected from the group consisting of potassium, lead, barium, lithium, cadmium, ammonium, sodium, copper, rubidium, nickel, strontium, cobalt, cesium and calcium.
Claim 4
Dependent Claim
25 words
Process of claim 2 wherein the adsorbent has at least one cation chosen from the group consisting of potassium, lead, barium, lithium, ammonium and cadmium.
Claim 5
Dependent Claim
25 words
Process of claim 3 wherein the adsorbent has a cation of potassium combined with a cation chosen from the group consisting of barium and lead.
Claim 6
Dependent Claim
19 words
Process of claim 2 wherein the adsorbed aromatic components are desorbed by passing a desorbent material through said bed.
Claim 7
Dependent Claim
35 words
Process of claims 2, 3, 4, or 5 wherein the hydrocarbon feed stream contains a mixture of ortho-xylene and at least one of the aromatics selected from the group consisting of para-xylene, meta-xylene and ethylbenzene.
Claim 8
Dependent Claim
21 words
Process of claims 1, 2, 3, 4, or 5 wherein the hydrocarbon feed stream contains a mixture of C 9 aromatics.
Claim 9
Dependent Claim
21 words
Process of claims 1, 2 3, 4 or 5 wherein the hydrocarbon feed stream contains a mixture of C 10 aromatics.
Claim 10
Dependent Claim
45 words
Process of claims 1 or 2 further characterized in that said adsorbent contains at least one cation which imparts an (α) separation factor of at least 2.0 of the ortho aromatic isomer over at least one of the other components of the hydrocarbon feed stream.
Claim 11
Dependent Claim
21 words
Process of claim 5 wherein the desorbent is selected from the group consisting of toluene, benzene, paraffin, diethylbenzene and mixtures thereof.
Claim 12
Dependent Claim
47 words
Process of claim 1 wherein the adsorbent has a formula in terms of mole ratios of oxides of 0.05-0.55 M 2 O:0.45 to 0.95 Na 2 O:Al 2 O 3 :3-7SiO 2 :XH 2 O where M is cesium or thallium and X is 0 to 10.
Claim 13
Dependent Claim
21 words
Process of claim 11 wherein the adsorbent has a reduced sodium ion content as a result of having been cation exchanged.
Claim 14
Dependent Claim
32 words
Process of claim 1 wherein the separation is carried out at a temperature within the range of ambient to 450° F. and a pressure within the rante of atmospheric to 500 psig.
Claim 15
Dependent Claim
14 words
Process of claim 13 wherein the process is caried out in the liquid phase.
Claim 16
Dependent Claim
14 words
Process of claim 1 wherein the process is carried out in the vapor phase.
Claim 17
Dependent Claim
12 words
Process of claim 1 wherein the adsorbent is combined with a binder.
Claim 18
Dependent Claim
22 words
Process of claim 16 wherein the binder is selected from the group consisting of natural and synthetic clays, inorganic oxides, and lubricants.
Claim 19
Dependent Claim
23 words
Process of claim 9 further characterized in that said adsorbent has a capacity of at least 5% of hydrocarbon by weight of adsorbent.
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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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |