US3686342A
Expired / Lapsed
US
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Aromatic hydrocarbon separation by adsorption
Assignee: Universal Oil Products Co
•
Filing: 1970-09-18
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Granted: 1972-08-22
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Expires: 1990-09-18
Abstract
Abstract An improved adsorptive separation process for the separating of at least one C8 aromatic hydrocarbon from a hydrocarbon feed containing a mixture of C8 aromatic hydrocarbons which process employs a crystalline aluminosilicate adsorbent to selectively adsorb one C8 aromatic from the feed. The improvement basically comprises employing a desorbent containing para-diethylbenzene to increase the selectivity of crystalline aluminosilicate for a given feed aromatic and thereby allowing a more efficient separation with a higher purity extract stream recovered from the process.
Inventors
- 👤 Richard W Neuzil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:03
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
38 words
The process of claim 1 further characterized in that said adsorbent contains at least one cation selected from the group consisting of lithium, sodium, potassium, beryllium, magnesium, calcium, strontium, barium, nickel, copper, silver, manganese, cadmium and combinations thereof.
Claim 2
Dependent Claim
23 words
The process of claim 2 further characterized in that said desorbent contains from about 10 vol. percent to about 60 vol. percent para-diethylbenzene.
Claim 3
Dependent Claim
43 words
The process of claim 2 further characterized in that said adsorbent contains pairs of cations selected from the group consisting of potassium and barium, potassium and beryllium, potassium and magnesium, rubidium and barium, cesium and barium, potassium and rubidium, and, potassium and cesium.
Claim 4
Dependent Claim
26 words
The process of claim 2 further characterized in that said adsorbent contains barium cations as the major cation at the cationic exchangeable sites within the adsorbent.
Claim 5
Dependent Claim
16 words
The process of claim 2 further characterized in that said feed comprises para-xylene, meta-xylene and ethylbenzene.
Claim 6
Dependent Claim
13 words
The process of claim 6 further characterized in that said feed comprises ortho-xylene.
Claim 7
Dependent Claim
16 words
The process of claim 2 further characterized in that said adsorbent contains barium and potassium cations.
Claim 8
Dependent Claim
26 words
The process of claim 8 further characterized in that said adsorbent contains a weight ratio of barium to potassium of from about 1 to about 30.
Claim 9
Dependent Claim
20 words
The process of claim 2 further characterized in that said desorbent material contains para-diethylbenzene in admixture with a saturated hydrocarbon.
Claim 10
Dependent Claim
15 words
The process of claim 10 further characterized in that said saturated hydrocarbon is a paraffin.
Claim 11
Dependent Claim
15 words
The process of claim 10 further characterized in that said saturated hydrocarbon is a cycloparaffin.
Claim 12
Dependent Claim
14 words
The process of claim 10 further characterized in that said saturated hydrocarbon is decahydronaphthalene.
Claim 13
Dependent Claim
26 words
The process of claim 10 further characterized in that said admixture contains from about 10 vol. percent to about 60 vol. percent para-diethylbenzene with said saturate.
Claim 14
Dependent Claim
172 words
In an adsorptive separation process for the separation of para-xylene from a hydrocarbon feed containing a mixture of C8 aromatic hydrocarbons wherein a desorbent is used which has a higher boiling point than the C8 aromatic hydrocarbons of said feed which process comprises the steps of: i. contacting said hydrocarbon feed with a crystalline aluminosilicate adsorbent selected from the group of Type X or Type Y zeolites containing a selected cation or cations at the exchangeable cationic sites within said zeolite in the presence of desorbent at less than equilibrium Adsorption conditions allowing a competitive but selective adsorption of para-xylene with respect to the desorbent for the adsorptive sites on the adsorbent; ii. removing a raffinate material from said adsorbent which contains the less selectively adsorbed components of the feed; iii. contacting said adsorbent with desorbent material at desorption conditions to effect displacing of said para-xylene from said adsorbent; and, iv. removing from said adsorbent an extract material comprising desorben material and para-xylene; the improvement which comprises employing a desorbent containing para-diethylbenzene.
Claim 15
Dependent Claim
16 words
The process of claim 15 further characterized in that said feed stock contains para-xylene and meta-xylene.
Claim 16
Dependent Claim
50 words
The process of claim 16 further characterized in that said adsorbent contains cations or cation pairs selected from the group consisting of potassium, rubidium, cesium, sodium, barium, silver, potassium and barium, potassium and beryllium, potassium and magnesium, rubidium and barium, cesium and barium, potassium and rubidium, and potassium and cesium.
Claim 17
Dependent Claim
20 words
The process of claim 17 further characterized in that said desorbent material comprises para-diethylbenzene in admixture with a saturated hydrocarbon.
Claim 18
Dependent Claim
14 words
The process of claim 18 further characterized in that said saturate is a paraffin.
Claim 19
Dependent Claim
14 words
The process of claim 18 further characterized in that said saturate is a cycloparaffin.
Claim 20
Dependent Claim
13 words
The process of claim 18 further characterized in that said saturate is decahydronaphthalene.
Claim 21
Dependent Claim
14 words
The process of claim 16 further characterized in that said feed stock contains ethylbenzene.
Claim 22
Dependent Claim
48 words
The process of claim 22 further characterized in that said adsorbent contains cation or cations pairs selected from the group consisting of potassium, sodium, barium, silver, potassium and barium, potassium and beryllium, potassium and magnesium, rubidium and barium, cesium and barium, potassium and rubidium, and potassium and cesium.
Claim 23
Dependent Claim
20 words
The process of claim 23 further characterized in that said desorbent material comprises para-diethylbenzene in admixture with a saturated hydrocarbon.
Claim 24
Dependent Claim
14 words
The process of claim 23 further characterized in that said saturate is a cycloparaffin.
Claim 25
Dependent Claim
13 words
The process of claim 23 further characterized in that said saturate is decahydronaphthalene.
Claim 26
Dependent Claim
25 words
The process of claim 23 further characterized in that said adsorbent contains barium at a major portion of the exchangeable cationic sites within the zeolite.
Claim 27
Dependent Claim
26 words
The process of claim 23 further characterized in that said adsorbent contains a weight ratio of barium to potassium of from about 1 to about 30.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |