US4469806A
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Organophosphorus-treated zeolite catalysts for para-selective aromatics conversion
Assignee: Mobil Oil AS
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Filing: 1983-04-28
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Granted: 1984-09-04
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Expires: 2003-04-28
Abstract
Abstract A method is provided for treating modified ZSM-5 type zeolite catalysts with a vapor phase organophosphorus reagent such as trimethylphosphite or dimethylmethylphosphonate in order to improve the para-selective properties of such catalysts for the conversion of aromatic materials. The modified zeolites so treated are those which contain a minor proportion of a difficultly reducible oxide such as magnesium oxide, calcium oxide and/or phosphorus oxide. Such catalyst compositions can be used in alkylation, transalkylation or disproportionation processes to provide alkylated aromatic product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.
Inventors
- 👤 Nancy P. Forbus
- 👤 Warren W. Kaeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:43
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/861; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C07C2/54; C07C2/64; C07C2/66; C07C2/862; C07C2/864; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/24; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; B01J29/65; B01J29/70; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A method for treating a chemically modified zeolite catalyst useful for promoting the para-selective conversion of aromatic compounds to dialkyl substituted benzene materials, said catalyst comprising both a crystalline zeolite material having a constraint index within the approximate range of 1 to 12 and a silica/alumina mole ratio of at least 12 and a minor proportion of one or more difficultly reducible oxides, said method comprising contacting said catalyst with a vapor phase organophosphorus reagent selected from C 1-4 alkyl phosphite esters, C 1-4 alkyl phosphate esters and dimethylmethylphosphonate, at a temperature of 100° C. to 300° C. and for a period of time and under conditions sufficient to either enhance para-selectivity of said catalyst or to reduce the susceptibility of said catalyst to deselectivation by contact with moisture or halogen.
Claim 2
Independent Claim
131 words
A method for treating a chemically modified zeolite catalyst useful for promoting the para-selective conversion of aromatic compounds to dialkyl substituted benzene materials, said catalyst comprising both a crystalline zeolite material having a constraint index within the approximate range of 1 to 12 and a silica/alumina mole ratio of at least 12 and a minor proportion of one or more difficultly reducible oxides, said method comprising contacting said catalyst with a vapor phase organophosphorus reagent selected from C 1-4 alkyl phosphite esters, C 1-4 alkyl phosphate esters and dimethylmethylphosphonate, at a temperature of 100° C. to 300° C. and for a period of time and under conditions sufficient to either enhance para-selectivity of said catalyst or to reduce the susceptibility of said catalyst to deselectivation by contact with moisture or halogen.
Claim 3
Dependent Claim
35 words
A method according to claim 1 wherein said difficultly reducible oxide is selected from magnesium oxide, calcium oxide, phosphorus oxide, combinations of magnesium oxide and phosphorus oxide and combinations of calcium oxide and phosphorus oxide.
Claim 4
Dependent Claim
62 words
A method according to claim 1 wherein contact between catalyst and organophosphorus reagent occurs at a temperature of from about 150° C. to 250° C., wherein organophosphorus reagent is contacted with catalyst for a period of fro about 0.2 to 1.0 hour; and wherein catalyst is contacted with at least about 0.5 gram of organophosphorus reagent per gram of catalyst per hour.
Claim 5
Dependent Claim
27 words
A method according to claim 1 wherein said catalyst is contacted with organophosphorus reagent admixed with an inert gaseous diluent selected from nitrogen, carbon dioxide and helium.
Claim 6
Dependent Claim
20 words
A method according to claim 1 wherein said zeolite is selected from ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 7
Dependent Claim
17 words
A method according to claim 1 wherein the organophosphorus reagent is trimethylphosphite, tributylphosphite, trimethylphosphate, tributylphosphate, or dimethylmethylphosphonate.
Claim 8
Dependent Claim
12 words
A catalyst composition prepared in accordance with the method of claim 1.
Claim 9
Dependent Claim
31 words
A catalyst composition according to claim 7 comprising from about 1 to 99% by weight of zeolite material with the balance of said composition comprising a binder for said zeolite material.
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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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |