Patent US4324941A successfully refreshed from Google Patents.
US4324941A
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Process for the production of cumene
Assignee: Euteco Impianti SpA
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Filing: 1981-01-15
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Granted: 1982-04-13
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Expires: 2001-01-15
Abstract
Abstract Cumene is prepared by alkylation of benzene with propylene in the presence of a solid phosphoric acid catalyst in a continuous process by delivering liquid benzene and liquid propylene in a molar ratio lower than 6:1, to a liquid reaction medium consisting essentially of benzene and cumene and containing the catalyst, while maintaining the temperature and composition of said medium substantially uniform in each point, operating at 170°-280° C. and in the liquid phase, and with a contact time higher than about 0.4 hours, expressed as the ratio between volume of catalyst and hourly volume of reagents fed in.
Inventors
- 👤 Marcello Ghirga
- 👤 Luigi Valtorta
- 👤 Benedetto Calcagno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:04
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/70; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
A process for producing cumene by alkylation of benzene with propylene in the presence of a solid phosphoric acid catalyst, which comprises: continuously delivering liquid benzene and liquid propylene in a benzene/propylene molar ratio lower than 6:1, to a liquid reaction medium consisting essentially of benzene and cumene and containing the solid phosphoric acid catalyst, the temperature and composition of said medium being maintained substantially uniform in each point by means of an efficient agitation; operating at a temperature of from 170° to 280° C., under a pressure such as to maintain propylene in the liquid phase, with a contact time higher than about 0.4 hours, expressed as the ratio between volume of catalyst and hourly volume of benzene and propylene fed in, and with a propylene conversion of at least about 60%; and discharging continuously a stream of liquid reaction medium and recovering cumene present in said stream.
Claim 2
Dependent Claim
149 words
A process for producing cumene by alkylation of benzene with propylene in the presence of a solid phosphoric acid catalyst, which comprises: continuously delivering liquid benzene and liquid propylene in a benzene/propylene molar ratio lower than 6:1, to a liquid reaction medium consisting essentially of benzene and cumene and containing the solid phosphoric acid catalyst, the temperature and composition of said medium being maintained substantially uniform in each point by means of an efficient agitation; operating at a temperature of from 170° to 280° C., under a pressure such as to maintain propylene in the liquid phase, with a contact time higher than about 0.4 hours, expressed as the ratio between volume of catalyst and hourly volume of benzene and propylene fed in, and with a propylene conversion of at least about 60%; and discharging continuously a stream of liquid reaction medium and recovering cumene present in said stream.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said benzene/propylene molar ratio is from 2:1 to 4:1.
Claim 4
Dependent Claim
30 words
The process of claim 1, wherein the catalyst is in the form of particles with a size of from 20 to 300 microns in suspension in the liquid reaction medium.
Claim 5
Dependent Claim
17 words
The process of claim 3, wherein said particles have a size of from 50 to 250 microns.
Claim 6
Dependent Claim
18 words
The process of claim 1, wherein the reaction medium contains from 1 to 30% by weight of catalyst.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein the reaction medium contains from 10 to 20% by weight of catalyst.
Claim 8
Dependent Claim
20 words
The process of claim 1, wherein the alkylation is carried out at a temperature of from 200° to 250° C.
Claim 9
Dependent Claim
17 words
The process of claim 1, wherein the operating pressure is from 15 to 50 Kg/cm 2 .
Claim 10
Dependent Claim
15 words
The process of claim 1, wherein said contact time is from 0.4 to 3 hours.
Claim 11
Dependent Claim
15 words
The process of claim 1, wherein said contact time is from 0.5 to 1 hour.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |