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US4233186A
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Catalysts for water dealkylation of aromatic hydrocarbons
Assignee: Elf Antar France
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Filing: 1979-03-16
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Granted: 1980-11-11
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Expires: 1999-03-16
Abstract
Abstract Water dealkylation catalysts of petroleum fractions containing monoalkylated or polyalkylated aromatic hydrocarbons including at least one metal of group VIII deposited in a proportion of from 0.1 to 5% by weight on a spinel, and having deposited in a proportion of from 0.1 to 5% by weight on a spinel, and having improved properties of activity, selectivity and stability, characterized in that the carrier is a mixed spinel of the formula (MxM'1-x)Al2O4 wherein M is a bivalent base metal of group VIII such as nickel, iron and cobalt and M' is a bivalent metal belonging to groups 2a, 7b, 1b or 2b such as magnesium, manganese, copper and zinc. The mol. ratio M/M' may vary from 0.5:1 to 50:1, preferably from 1:1 to 20:1.
Inventors
- 👤 Daniel Duprez
- 👤 Michel Grand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:20
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/20; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/76; C07C2521/00; C07C2521/10; C07C2523/00; C07C2523/06; C07C2523/16; C07C2523/32; C07C2523/34; C07C2523/38; C07C2523/40; C07C2523/42; C07C2523/44; C07C2523/46; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/75; C07C2523/755; Y; Y10; Y10S; Y10S502/00; Y10S502/524
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
In a water dealkylation catalyst for petroleum fractions containing monoalkylated or polyalkylated aromatic hydrocarbons including at least one metal of group VIII deposited in a proportion of from 0.1 to 5% by weight on a spinel having improved activity, selectivity and stability, the improvement which comprises a carrier of mixed spinel of the formula (M x M' 1-x )Al 2 O 4 wherein M is a bivalent base metal of group VIII of the Periodic Table, M' is a bivalent metal selected from groups 2a, 7b, 1b and 2b of the Periodic Table, wherein the molar ratio M/M' is from about 0.5:1 to 50:1 and wherein x is the molar fraction of M.
Claim 2
Dependent Claim
113 words
In a water dealkylation catalyst for petroleum fractions containing monoalkylated or polyalkylated aromatic hydrocarbons including at least one metal of group VIII deposited in a proportion of from 0.1 to 5% by weight on a spinel having improved activity, selectivity and stability, the improvement which comprises a carrier of mixed spinel of the formula (M x M' 1-x )Al 2 O 4 wherein M is a bivalent base metal of group VIII of the Periodic Table, M' is a bivalent metal selected from groups 2a, 7b, 1b and 2b of the Periodic Table, wherein the molar ratio M/M' is from about 0.5:1 to 50:1 and wherein x is the molar fraction of M.
Claim 3
Dependent Claim
20 words
A catalyst of claim 1, wherein M is selected from the group consisting of nickel, iron, cobalt and mixtures thereof.
Claim 4
Dependent Claim
21 words
A catalyst of claim 1, wherein M' is selected from the group consisting of magnesium, manganese, copper, zinc and mixtures thereof.
Claim 5
Dependent Claim
36 words
A catalyst of claim 1, wherein M is selected from the group consisting of nickel, iron, cobalt and mixtures thereof and M' is selected from the group consisting of magnesium, manganese, copper, zinc and mixtures thereof.
Claim 6
Dependent Claim
32 words
A catalyst of claims 1, 2 or 3, wherein the group VIII supported on said spinel is a metal selected from the group consisting of rhodium, platinum, palladium. iridium and mixtures thereof.
Claim 7
Dependent Claim
29 words
The catalyst of claim 1, 2 or 3, wherein the group VIII metal supported on said spinel is selected from the group consisting of rhodium, iridium and mixtures thereof.
Claim 8
Dependent Claim
28 words
The catalyst of claim 4, wherein the group VIII metal supported on the spinel is selected from the group consisting of rhodium, platinum, palladium, iridium and mixtures thereof.
Claim 9
Dependent Claim
85 words
A catalyst according to claim 1, 4 or 7, wherein at least one metal of group VIII is deposited on the mixed spinel by impregnation with aqueous solutions of salts of the metals selected, and the carrier thus impregnated is dried, calcined in the air, reduced prior to use in a current of hydrogen at a temperature of 400° to 550° C. and treated by a current of water vapor at a temperature of 400° to 600° C. for from 5 minutes to 15 hours.
Claim 10
Dependent Claim
33 words
A catalyst of claim 1, 4 or 7, wherein the mixed spinel is a spinel (Ni x Mg 1-x ) Al 2 O 4 wherein the Ni/Mg ratio is from 1:1 to 3:1.
Claim 11
Dependent Claim
23 words
A catalyst of claim 1, wherein the mixed spinel is a spinel (Ni 0 .75 Mg 0 .25) Al 2 O 4 .
Claim 12
Dependent Claim
47 words
A catalyst of claim 3, wherein the spinel is selected from the group consisting of (Ni 0 .75 Mn 0 .25) Al 2 O 4 --(Ni 0 .75 Cu 0 .25) Al 2 O 4 and (Ni 0 .75 Zn 0 .25) Al 2 O 4 .
Claim 13
Dependent Claim
30 words
A catalyst of claim 5 comprising a mixture of 2 metals of group VIII on a mixed spinel, the relative proportion of said 2 metals being from 1/10 to 10/1.
Claim 14
Dependent Claim
16 words
A catalyst according to claim 2 wherein the molar ratio M/M' is between 1 and 20.
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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |