US4304657A
Expired / Lapsed
US
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Aromatization process
Assignee: Chevron USA Inc
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Filing: 1980-07-03
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Granted: 1981-12-08
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Expires: 2000-07-03
Abstract
Abstract An improved aromatization process is disclosed for upgrading the octane of an aliphatic feedstream, increasing the hydrogen to methane mol ratio of the product and decreasing the C 10 + aromatics production. In the process the feed is diluted with CO, CO 2 or N 2 at a mol ratio in the range of 1:1 to 1:20 of feed to diluent, and passed over a ZSM-5-type of aluminosilicate zeolite catalyst.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:48
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
A process for converting a feedstock selected from the group consisting of light straight run naphthas, coker gasolines, FCC gasolines, and pyrolysis gasolines to a product stream comprising aromatic hydrocarbons, hydrogen and methane comprising contacting said feedstock with an aromatization catalyst comprising a zinc HZSM-5 catalyst at a temperature in the range of 340° C. to 815° C. and a pressure in the range from 1 atmosphere to 35 atmospheres in the presence of a diluent essentially free of molecular oxygen, said diluent selected from the group consisting of CO 2 and N 2 at a mol ratio of feedstock to diluent ranging from 1:1 to 1:20.
Claim 2
Dependent Claim
107 words
A process for converting a feedstock selected from the group consisting of light straight run naphthas, coker gasolines, FCC gasolines, and pyrolysis gasolines to a product stream comprising aromatic hydrocarbons, hydrogen and methane comprising contacting said feedstock with an aromatization catalyst comprising a zinc HZSM-5 catalyst at a temperature in the range of 340° C. to 815° C. and a pressure in the range from 1 atmosphere to 35 atmospheres in the presence of a diluent essentially free of molecular oxygen, said diluent selected from the group consisting of CO 2 and N 2 at a mol ratio of feedstock to diluent ranging from 1:1 to 1:20.
Claim 3
Dependent Claim
20 words
A process as recited in claim 1 wherein said mol ratio of feedstock to diluent ranges from 1:5 to 1:10.
Claim 4
Dependent Claim
18 words
A process as recited in claim 1 wherein said mol ratio of feedstock to diluent is approximately 1:6.
Claim 5
Dependent Claim
20 words
A process as recited in claim 1 wherein said temperature is in the range from 480° C. to 540° C.
Claim 6
Dependent Claim
19 words
A process as recited in claim 1 wherein said process is conducted at a pressure of approximately one atmosphere.
Claim 7
Dependent Claim
71 words
A process for converting an aliphatic feedstock to a product stream comprising aromatic hydrocarbons, hydrogen, and methane comprising contacting said feedstock with an aromatization catalyst at a temperature in the range of 340° C. to 815° C. and a pressure in the range from 1 atmosphere to 35 atmospheres, in the presence of a diluent comprising CO 2 at a mol ratio of feedstock to diluent ranging from 1:1 to 1:20.
Claim 8
Dependent Claim
71 words
A process for converting an aliphatic feedstock to a product stream comprising aromatic hydrocarbons, hydrogen, and methane comprising contacting said feedstock with an aromatization catalyst at a temperature in the range of 340° C. to 815° C. and a pressure in the range from 1 atmosphere to 35 atmospheres, in the presence of a diluent comprising CO 2 at a mol ratio of feedstock to diluent ranging from 1:1 to 1:20.
Claim 9
Dependent Claim
16 words
A process as recited in claim 6 wherein said aromatization catalyst comprises a zinc HZSM-5 catalyst.
Claim 10
Dependent Claim
16 words
A process as recited in claim 6, wherein the diluent consists essentially of CO 2 .
Claim 11
Dependent Claim
14 words
A process as recited in claim 1, wherein the diluent is CO 2 .
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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |