US4387260A
Expired / Lapsed
US
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Alkylation of aromatic compounds with silicalite catalysts in the presence of steam
Assignee: Cosden Technology Inc
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Filing: 1981-12-07
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Granted: 1983-06-07
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Expires: 2001-12-07
Abstract
Abstract A process and apparatus for alkylating aromatic compounds with silicalite alkylation catalysts in the presence of an effective amount of water which extends the cycle length of the reaction by decreasing the rate of activity loss of the catalyst and decreases the production of unwanted by-products.
Inventors
- 👤 James M. Watson
- 👤 James R. Butler
- 👤 Cleve H. Forward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2529/00; C07C2529/03; C07C2529/035; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
51 words
A process for producing alkylaromatic compounds comprising passing an aromatic compound, a reactive alkene and an effective amount of water through a bed of a silicalite alkylation catalyst at alkylation conditions and recovering the resulting alkylaromatic compound, the presence of said water effecting enhanced catalytic conversion to the desired alkylaromatic compound.
Claim 2
Dependent Claim
51 words
A process for producing alkylaromatic compounds comprising passing an aromatic compound, a reactive alkene and an effective amount of water through a bed of a silicalite alkylation catalyst at alkylation conditions and recovering the resulting alkylaromatic compound, the presence of said water effecting enhanced catalytic conversion to the desired alkylaromatic compound.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein said water is introduced in the form of superheated steam.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein said aromatic compound, said reactive alkene and said water are admixed prior to introduction into a reaction zone containing the alkylation catalyst bed.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein a molar excess of aromatic compound is introduced into the reaction zone.
Claim 6
Dependent Claim
26 words
A process according to claim 4, wherein the mole ratio of aromatic compound to reactive alkene lies in the range from about 2 to about 20.
Claim 7
Dependent Claim
12 words
A process according to claim 1, wherein said reactive alkene is ethylene.
Claim 8
Dependent Claim
12 words
A process according to claim 6, wherein said aromatic compound is benzene.
Claim 9
Dependent Claim
12 words
A process according to claim 6, wherein said aromatic compound is toluene.
Claim 10
Dependent Claim
23 words
A process according to claim 1, wherein the temperature in the reaction zone is maintained between about 300° C. and about 600° C.
Claim 11
Dependent Claim
23 words
A process according to claim 9, wherein the temperature in the reaction zone is maintained between about 400° C. and about 460° C.
Claim 12
Dependent Claim
22 words
A process according to claim 1, wherein the pressure in the reaction zone is maintained between about 3 and about 25 atmospheres.
Claim 13
Dependent Claim
22 words
A process according to claim 11, wherein the pressure in the reaction zone is maintained between about 10 and about 15 atmospheres.
Claim 14
Dependent Claim
30 words
A process according to claim 1, wherein from about 20,000 ppm to about 100,000 ppm water based on the weight of the aromatic compound are introduced into the reaction zone.
Claim 15
Dependent Claim
25 words
A process according to claim 13, wherein about 40,000 ppm water based on the weight of the aromatic compound are introduced into the reaction zone.
Claim 16
Independent Claim
31 words
A method of reducing the loss of activity of silicalite catalyst materials employed in alkylation of aromatic substrates comprising introducing an effective amount of steam into the reaction zone during alkylation.
Claim 17
Independent Claim
31 words
A method of reducing the loss of activity of silicalite catalyst materials employed in alkylation of aromatic substrates comprising introducing an effective amount of steam into the reaction zone during alkylation.
Claim 18
Dependent Claim
31 words
The method of claim 15, wherein the amount of steam employed is in the range of from about 20,000 to about 60,000 ppm based on the weight of said aromatic substrate.
Claim 19
Dependent Claim
25 words
The method of claim 16, wherein said steam is introduced in an amount of about 40,000 ppm, based on the weight of said aromatic substrate.
Claim 20
Independent Claim
32 words
A method for reducing the production of undesired by-products during alkylation of aromatic substrates using silicalite catalysts comprising introducing an effective amount of steam into the reaction zone during the alkylation process.
Claim 21
Independent Claim
32 words
A method for reducing the production of undesired by-products during alkylation of aromatic substrates using silicalite catalysts comprising introducing an effective amount of steam into the reaction zone during the alkylation process.
Claim 22
Dependent Claim
13 words
The method of claim 18, wherein said undesired by-products comprise xylene or trimethylbenzene.
Claim 23
Dependent Claim
30 words
The method of claim 19, wherein the amount of steam employed is in the range of from about 20,000 to about 60,000 ppm, based on the weight of aromatic substrate.
Claim 24
Dependent Claim
21 words
The method of claim 20, wherein the amount of steam employed is 40,000 ppm, based on the weight of aromatic substrate.
References Cited (Backward Citations)
US4016218A
Cited
US4283306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |