EP0064046A1
Expired / Lapsed
EP
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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: 1982-04-19
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Granted: —
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Expires: 2002-04-19
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
- 👤 Cleve H. Forward
- 👤 James R. Butler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:11
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: 28
Claim 1
Independent Claim
37 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.
Claim 2
Dependent Claim
37 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.
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
21 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
22 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
Dependent Claim
85 words
Apparatus for producing alkylaromatic compounds comprising: reaction zone means; a bed of silicalite alkylation catalyst in said reaction zone means; means for introducing an aromatic substrate compound feed into contact with said catalyst bed in said reaction zone means; means for introducing a reactive alkene feed into contact with said catalyst bed in said reaction zone means; means for introducing a controlled amount of steam into said reaction zone means; and means for withdrawing an alkylaromatic compound containing product stream from said reaction zone means.
Claim 17
Dependent Claim
85 words
Apparatus for producing alkylaromatic compounds comprising: reaction zone means; a bed of silicalite alkylation catalyst in said reaction zone means; means for introducing an aromatic substrate compound feed into contact with said catalyst bed in said reaction zone means; means for introducing a reactive alkene feed into contact with said catalyst bed in said reaction zone means; means for introducing a controlled amount of steam into said reaction zone means; and means for withdrawing an alkylaromatic compound containing product stream from said reaction zone means.
Claim 18
Dependent Claim
21 words
Apparatus according to Claim 15, further comprising means for separating excess aromatic substrate compound from the alkylaromatic compound containing product stream.
Claim 19
Dependent Claim
21 words
Apparatus according to Claim 16, further comprising means for recycling separated aromatic substrate compound back to said aromatic substrate feed means.
Claim 20
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 21
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 22
Dependent Claim
31 words
The method of Claim 18, 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 23
Dependent Claim
25 words
The method of Claim 19, wherein said steam is introduced in an amount of about 40,000 ppm, based on the weight of said aromatic substrate.
Claim 24
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 25
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 26
Dependent Claim
13 words
The method of Claim 21, werein said undesired by-products comprise xylene or trimethylbenzene.
Claim 27
Dependent Claim
30 words
The method of Claim 22, 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 28
Dependent Claim
21 words
The method of Claim 23, wherein the amount of steam employed is 40,000 ppm, based on the weight of aromatic substrate.
References Cited (Backward Citations)
GB778014A
Cited
NL8001342A
Cited
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