US3843739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for transalkylating diethyl benzene
Assignee: Gulf Research and Development Co
•
Filing: 1973-05-16
•
Granted: 1974-10-22
•
Expires: 1993-05-16
Abstract
Abstract Process for transalkylating diethyl benzene to ethyl benzene with involves reacting benzene with ethylene to obtain a reaction product predominating in ethyl benzene and containing lesser amounts of polyalkyl benzenes and then contacting the total alkylation product with a zeolitic molecular sieve catalyst to transalkylate the polyalkyl benzenes to ethyl benzene.
Inventors
- 👤 E Harper
- 👤 R Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:19
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/073
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A PROCESS FOR PREPARING ETHYL BENZENE WHICH CONSISTS ESSENTIALLY OF SUBJECTING BENZENE TO ALKYLATION WITH ETHYLENE TO OBTAIN IN ALKYLATION PRODUCT CONTAINING UNREACTED BENZENE, DIETHYL BENZENE AND POLYALKYL BENZENES AND THEN SUBJECTING SAID ALKYLATION PRODUCT, WHILE MAINTAINING THE BENZENE THEREIN IN THE VAPOR PHASE, TO CONTACT WITH A ZEOLITIC MOLECULAR SIEVE HAVING A PORE SIZE LARGE ENOUGH TO PERMIT THE INTERNAL ABSORPTION OF BENZENE, A SILICA TO ALUMINA MOLAR RATIO OF AT LEAST ABOUT 3.0 AND NO MORE THAN 90 PERCENT OF ALUMINUM ATOMS ASSOCIATED WITH MONOVALENT CATIONS, AT A TEMPERATURE OF ABOUT 100* TO ABOUT 500*C. AND A PRESSURE OF ABOUT 5 TO ABOUT 500 POUNDS PER SQUARE INCH GAUGE.
Claim 2
Dependent Claim
111 words
A PROCESS FOR PREPARING ETHYL BENZENE WHICH CONSISTS ESSENTIALLY OF SUBJECTING BENZENE TO ALKYLATION WITH ETHYLENE TO OBTAIN IN ALKYLATION PRODUCT CONTAINING UNREACTED BENZENE, DIETHYL BENZENE AND POLYALKYL BENZENES AND THEN SUBJECTING SAID ALKYLATION PRODUCT, WHILE MAINTAINING THE BENZENE THEREIN IN THE VAPOR PHASE, TO CONTACT WITH A ZEOLITIC MOLECULAR SIEVE HAVING A PORE SIZE LARGE ENOUGH TO PERMIT THE INTERNAL ABSORPTION OF BENZENE, A SILICA TO ALUMINA MOLAR RATIO OF AT LEAST ABOUT 3.0 AND NO MORE THAN 90 PERCENT OF ALUMINUM ATOMS ASSOCIATED WITH MONOVALENT CATIONS, AT A TEMPERATURE OF ABOUT 100* TO ABOUT 500*C. AND A PRESSURE OF ABOUT 5 TO ABOUT 500 POUNDS PER SQUARE INCH GAUGE.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the temperature is in the range of about 150* to about 270* C. and the pressure about 16 to about 300 pounds per square inch gauge.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the molar ratio of benzene to said polyalkyl benzenes in the alkylation product is from about 200:1 to about 10:1.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the molar ratio of benzene to said polyalkyl benzenes in the alkylation product is from about 120:1 to about 40:1.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the alkylation charge is passed through the zeolitic molecular sieve using a space velocity of about 0.1 to about 80.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the alkylation charge is passed through the zeolitic molecular sieve using a space velocity of about one to about 15.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the remainder of the cations associated with said aluminum atoms are rare earth metal cations.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the remainder of the cations associated with said aluminum atoms are lanthanum cations.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said alkylation is carried out with a zeolitic molecular sieve as defined in claim 1.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein the alkylation is carried out while maintaining benzene in the liquid phase.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |