US4849569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of organic aromatic compounds
Assignee: Catalytic Distillation Technologies
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Filing: 1988-10-17
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Granted: 1989-07-18
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Expires: 2008-10-17
Abstract
Abstract Aromatic compounds are alkylated in a catalytic distillation, wherein the catalyst structure also serves as a distillation component by contacting the aromatic compound with a C 2 to C 10 olefin in the catalyst bed under 0.25 to 50 atmospheres of pressure and at temperatures in the range of 80° C. to 500° C., using as the catalyst a mole sieve characterized as acidic or an acidic cation exchange resin. For example, ethyl benzene is produced by feeding ethylene below the catalyst bed while benzene is conveniently added through the reflux in molar excess to that required to react with ethylene, thereby reacting substantially all of the ethylene and recovering benzene as the principal overhead and ethyl benzene in the bottoms.
Inventors
- 👤 Lawrence A. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:10
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14; B; B01; B01D; B01D3/00; B01D3/009; C07C2/00; C07C2/54; C07C2/64; C07C2/66; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y10; Y10S; Y10S203/00; Y10S203/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
196 words
A method for controlling the concentration of olefin in the alkylation of organic aromatic compounds comprising: (a) concurrently (i) feeding a C 2 to C 20 olefin into a fixed bed acidic catalytic distillation structure in a distillation reaction zone located in a distillation column reactor and having process flow rates (ii) contacting said olefin with an organic aromatic compound having a boiling point higher than said olefin thereby catalytically reacting said organic aromatic compound and said olefin to form an alkylation product there being a temperature depression in said distillation column reactor at a point immediately above the point at which said olefin is fed thereto, (iii) determining the concentration of said olefin in said reactor at a given temperature depression at a given pressure, (iv) adjusting the process flows rate in the distillation column reactor to maintain a selected temperature at said depression point whereby a specific mole ratio of organic aromatic compound to olefin is maintained and (v) fractionating the resultant alkylation product and the unreacted organic aromatic compound and olefin in said fixed bed, and (b) withdrawing said alkylation product from said distillation column reactor at a point below said fixed bed.
Claim 2
Independent Claim
196 words
A method for controlling the concentration of olefin in the alkylation of organic aromatic compounds comprising: (a) concurrently (i) feeding a C 2 to C 20 olefin into a fixed bed acidic catalytic distillation structure in a distillation reaction zone located in a distillation column reactor and having process flow rates (ii) contacting said olefin with an organic aromatic compound having a boiling point higher than said olefin thereby catalytically reacting said organic aromatic compound and said olefin to form an alkylation product there being a temperature depression in said distillation column reactor at a point immediately above the point at which said olefin is fed thereto, (iii) determining the concentration of said olefin in said reactor at a given temperature depression at a given pressure, (iv) adjusting the process flows rate in the distillation column reactor to maintain a selected temperature at said depression point whereby a specific mole ratio of organic aromatic compound to olefin is maintained and (v) fractionating the resultant alkylation product and the unreacted organic aromatic compound and olefin in said fixed bed, and (b) withdrawing said alkylation product from said distillation column reactor at a point below said fixed bed.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein a molar excess of organic aromatic compound to olefin is present.
Claim 4
Dependent Claim
22 words
The process according to claim 2 wherein from 2 to 100 moles of organic aromatic compound per mole of olefin are present.
Claim 5
Dependent Claim
22 words
The process according to claim 3 wherein from 2 to 50 moles of organic aromatic compound per mole of olefin are present.
Claim 6
Dependent Claim
22 words
The process according to claim 4 wherein from 2 to 10 moles of organic aromatic compound per mole of olefin are Present.
Claim 7
Dependent Claim
26 words
The process according to claim 2 wherein unreacted organic aromatic compound is recovered as an overhead and a portion thereof returned to said distillation column reactor.
Claim 8
Dependent Claim
17 words
The process according to claim 1 wherein said organic aromatic compound has 6 to 20 carbon atoms.
Claim 9
Dependent Claim
29 words
The process according to claim 1 wherein said organic aromatic compound has a boiling point of 250° C. or less under the pressure conditions in said distillation column reactor.
Claim 10
Dependent Claim
23 words
The process according to claim 1 wherein said pressure in said distillation column reactor is in the range of 0.25 to 40 atmospheres.
Claim 11
Dependent Claim
19 words
The process according to claim 9 wherein the temperature is in the range of 50° C. to 500° C.
Claim 12
Dependent Claim
18 words
The process according to claim 9 wherein said pressure is in the range of 0.5 to 20 atmospheres.
Claim 13
Dependent Claim
19 words
The process according to claim 11 wherein the temperature is in the range of 50° C. to 300° C.
Claim 14
Dependent Claim
17 words
The process according to claim 7 wherein said olefin is a C 2 to C 7 olefin.
Claim 15
Dependent Claim
17 words
The process according to claim 7 wherein said olefin is a C 8 to C 20 olefin.
Claim 16
Dependent Claim
18 words
The process according to claim 7 wherein said organic aromatic compound is benzene, xylene, toluene, phenol or cresol.
Claim 17
Dependent Claim
13 words
The process according to claim 15 wherein said organic aromatic compound is benzene.
Claim 18
Dependent Claim
13 words
The process according to claim 15 wherein said organic aromatic compound is phenol.
Claim 19
Dependent Claim
17 words
The process according to claim 15 wherein said olefin is a C 2 to C 4 olefin.
Claim 20
Dependent Claim
11 words
The process according to claim 16 wherein said olefin is ethylene.
Claim 21
Dependent Claim
11 words
The process according to claim 16 wherein said olefin is propylene.
Claim 22
Dependent Claim
30 words
The process according to claim 1 wherein process flow rates comprise olefin feed, organic aromatic compound feed, organic aromatic compound overhead, organic aromatic compound reflux, olefin overhead, alkylation product withdrawal.
Claim 23
Dependent Claim
13 words
The process according to claim 1 wherein said olefin feed rate is adjusted.
Claim 24
Dependent Claim
11 words
The process according to claim 16 wherein said olefin is isopropylene.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |