US3998901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of ethylbenzene with an adsorbent comprising sr and k exchanged x or y zeolite
Assignee: Universal Oil Products Co
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Filing: 1975-07-14
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Granted: 1976-12-21
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Expires: 1995-07-14
Abstract
Abstract An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which process comprises contacting the feed mixture with an adsorbent comprising strontium and potassium exchanged type X or type Y zeolite, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and thereafter recovering high-purity ethylbenzene. A desorption step may be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.
Inventors
- 👤 Richard W. Neuzil
- 👤 Donald H. Rosback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:21
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
60 words
A process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which comprises contacting at adsorption conditions said mixture with an adsorbent comprising type X or type Y zeolite essentially completely exchanged with strontium and potassium, selectively adsorbing substantially all of said xylene isomers to the substantial exclusion of ethylbenzene, and thereafter recovering ethylbenzene.
Claim 2
Dependent Claim
60 words
A process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which comprises contacting at adsorption conditions said mixture with an adsorbent comprising type X or type Y zeolite essentially completely exchanged with strontium and potassium, selectively adsorbing substantially all of said xylene isomers to the substantial exclusion of ethylbenzene, and thereafter recovering ethylbenzene.
Claim 3
Dependent Claim
30 words
The adsorbent of claim 1 further characterized in that the adsorbent contains strontium and potassium in a weight ratio of strontium to potassium of from about 1 to about 275.
Claim 4
Dependent Claim
29 words
The process of claim 1 further characterized in that said adsorbent contains from about 0 to about 2.0 wt. % water measured by loss on ignition at 500° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 further characterized in that said feed mixture contains para-xylene, meta-xylene, and ortho-xylene.
Claim 6
Dependent Claim
27 words
The process of claim 4 further characterized in that the concentration of ortho-xylene in said feed mixture is less than the concentration of either para-xylene or meta-xylene.
Claim 7
Dependent Claim
27 words
The process of claim 4 further characterized in that the concentration of para-xylene in said feed mixture is less than the concentrations of either ortho-xylene or meta-xylene.
Claim 8
Dependent Claim
27 words
The process of claim 4 further characterized in that the concentrations of ortho-xylene abd para-xylene in said feed mixture are each less than the concentration of meta-xylene.
Claim 9
Dependent Claim
16 words
The process of claim 1 further characterized in that said feed mixture contains two xylene isomers.
Claim 10
Dependent Claim
30 words
The process of claim 1 including the step of treating the adsorbent containing said isomers with a desorbent material to remove the adsorbed xylenes therefrom as a fluid extract stream.
Claim 11
Dependent Claim
25 words
The process of claim 9 further characterized in that said desorbent material has an average boiling point substantially different from that of the feed mixture.
Claim 12
Dependent Claim
14 words
The process of claim 9 further characterized in that said desorbent material comprises toluene.
Claim 13
Dependent Claim
42 words
The process of claim 1 further characterized in that said adsorption conditions include a temperature within the range of from about 70° F. to about 450° F. and at a pressure within the range of from about atmospheric to about 500 psig.
Claim 14
Dependent Claim
14 words
The process of claim 12 further characterized in being effected in the liquid phase.
Claim 15
Dependent Claim
115 words
A process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which process comprises the steps of: a. contacting at adsorption conditions said mixture with an adsorbent comprising type X or type Y zeolite essentially completely exchanged with strontium and potassium and adsorbing substantially all of said xylene isomers to the substantial exclusion of ethylbenzene; b. withdrawing from the adsorbent a raffinate stream comprising ethylbenzene; c. contacting the adsorbent at desorption conditions with a desorbent material having a boiling point substantially different from that of the feed mixture to effect the removal of the xylene isomers; and d. withdrawing from the adsorbent an extract stream comprising said xylene isomers.
Claim 16
Dependent Claim
115 words
A process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which process comprises the steps of: a. contacting at adsorption conditions said mixture with an adsorbent comprising type X or type Y zeolite essentially completely exchanged with strontium and potassium and adsorbing substantially all of said xylene isomers to the substantial exclusion of ethylbenzene; b. withdrawing from the adsorbent a raffinate stream comprising ethylbenzene; c. contacting the adsorbent at desorption conditions with a desorbent material having a boiling point substantially different from that of the feed mixture to effect the removal of the xylene isomers; and d. withdrawing from the adsorbent an extract stream comprising said xylene isomers.
Claim 17
Dependent Claim
30 words
The process of claim 14 further characterized in that said adsorbent contains strontium and potassium in a weight ratio of strontium to potassium of from about 1 to about 275.
Claim 18
Dependent Claim
29 words
The process of claim 14 further characterized in that said adsorbent contains from about 0 to about 2.0 wt. % water measured by loss on ignition at 500° C.
Claim 19
Dependent Claim
14 words
The process of claim 14 further characterized in that said feed mixture contains para-xylene.
Claim 20
Dependent Claim
22 words
The process of claim 17 further characterized in that the concentration of ethylbenzene is less than or equal to that of para-xylene.
Claim 21
Dependent Claim
19 words
The process of claim 17 further characterized in that the concentration of ethylbenzene is greater than that of para-xylene.
Claim 22
Dependent Claim
17 words
The process of claim 14 further characterized in that said feed mixture contains para-xylene, meta-xylene, and ortho-xylene.
Claim 23
Dependent Claim
27 words
The process of claim 20 further characterized in that the concentration of ortho-xylene in said feed mixture is less than the concentrations of either para-xylene or meta-xylene.
Claim 24
Dependent Claim
27 words
The process of claim 20 further characterized in that the concentration of para-xylene in said feed mixture is less than the concentrations of either ortho-xylene or meta-xylene.
Claim 25
Dependent Claim
27 words
The process of claim 20 further characterized in that the concentrations of ortho-xylene and para-xylene in said feed mixture are each less than the concentration of meta-xylene.
Claim 26
Dependent Claim
16 words
The process of claim 14 further characterized in that said feed mixture contains two xylene isomers.
Claim 27
Dependent Claim
14 words
The process of claim 14 further characterized in that said desorbent material comprises toluene.
Claim 28
Dependent Claim
44 words
The process of claim 14 further characterized in that said adsorption conditions and desorption conditions include a temperature within the range of from about 70° F. to about 450° F. and a pressure within the range of from about atmospheric to about 500 psig.
Claim 29
Dependent Claim
14 words
The process of claim 26 further characterized in being effected in the liquid phase.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |