Patent US3720729A successfully refreshed from Google Patents.
US3720729A
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Pyrolysis of hydrotreated feedstocks
Assignee: Lummus Technology LLC
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Filing: 1970-11-02
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Granted: 1973-03-13
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Expires: 1990-11-02
Abstract
Abstract Heavy hydrocarbon feedstocks are subjected to a hydrogenation pre-treatment prior to pyrolysis, said hydrogenation step being so controlled as to avoid hydrocracking and being carried out at a temperature of from about 640* to about 800* F and at a pressure of from about 750 to about 1,250 psig when a significantly increased yield of mononuclear aromatics is desired and at a pressure of from about 1,250 to about 3,000 psig when a significantly increased yield of 1,3-butadiene is desired.
Inventors
- 👤 M Sze
- 👤 N Kafes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:56
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/32; C10G45/34; C10G45/40; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/883; B01J37/00; B01J37/20; C10G2400/00; C10G2400/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
145 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to effect the production of pyrolysis products having varied aromatic content and 1,3-butadiene content by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof, at a temperature of from about 640* to 800*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and selectively at a pressure of from about 750 to about 1,250 psig where a pyrolysis product of increased aromatic content is desired and to a pressure of from about 1,250 to about 3,000 psig where a pyrolysis product of increased 1,3-butadiene content is desired.
Claim 2
Dependent Claim
145 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to effect the production of pyrolysis products having varied aromatic content and 1,3-butadiene content by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof, at a temperature of from about 640* to 800*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and selectively at a pressure of from about 750 to about 1,250 psig where a pyrolysis product of increased aromatic content is desired and to a pressure of from about 1,250 to about 3,000 psig where a pyrolysis product of increased 1,3-butadiene content is desired.
Claim 3
Dependent Claim
106 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to increase the yield of aromatic hydrocarbons by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at a temperature of from about 640* to about 740*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and a pressure of from about 750 to about 1,250 psig.
Claim 4
Dependent Claim
106 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to increase the yield of aromatic hydrocarbons by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at a temperature of from about 640* to about 740*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and a pressure of from about 750 to about 1,250 psig.
Claim 5
Dependent Claim
92 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to increase the yield of aromatic hydrocarbons by subjecting said feedstock to hydrogenating in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at an average temperature of 700*F, a pressure of about 1,000 psig and a liquid hourly space velocity of 1.6.
Claim 6
Dependent Claim
92 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis to increase the yield of aromatic hydrocarbons by subjecting said feedstock to hydrogenating in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at an average temperature of 700*F, a pressure of about 1,000 psig and a liquid hourly space velocity of 1.6.
Claim 7
Dependent Claim
105 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis thereof to increase the yield of 1,3-butadiene by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at a temperature of from about 640* to about 740*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and a pressure from about 1250 to about 3,000 psig.
Claim 8
Dependent Claim
105 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis thereof to increase the yield of 1,3-butadiene by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at a temperature of from about 640* to about 740*F and a liquid hourly space velocity of from about 0.5 to about 3.0 and a pressure from about 1250 to about 3,000 psig.
Claim 9
Dependent Claim
93 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis thereof to increase the yield of 1,3-butadiene by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at an average temperature of 700*F and a liquid hourly space velocity of 1.6 and a pressure of about 2,500 psig.
Claim 10
Dependent Claim
93 words
In a process for the pyrolysis of a heavy hydrocarbon feedstock having a boiling range within the range of from about 400*F to about 1,100*F, the improvement which comprises selectively hydrogenating said feedstock prior to pyrolysis thereof to increase the yield of 1,3-butadiene by subjecting said feedstock to hydrogenation in contact with a catalyst comprising a member selected from the group consisting of Group VIb metals, Group VIII metals and mixtures thereof at an average temperature of 700*F and a liquid hourly space velocity of 1.6 and a pressure of about 2,500 psig.
Claim 11
Dependent Claim
17 words
A process according to claim 2 wherein the catalyst is a sulfided nickel-molybdenum on an alumina support.
Claim 12
Dependent Claim
17 words
A process according to claim 2 wherein the catalyst is a sulfided cobalt-molybdenum on an alumina support.
Claim 13
Dependent Claim
15 words
A process according to claim 2 wherein the catalyst is palladium on an alumina support.
Claim 14
Dependent Claim
17 words
A process according to claim 2 wherein the catalyst is a sulfided nickel-tungsten on an alumina support.
Claim 15
Dependent Claim
51 words
A process according to claim 2 wherein the feedstock is a gas oil feedstock having a boiling range within the range of from about 400* to about 1,100*F, an API gravity of from about 18 to about 45 and a total aromatics content of from about 20 to about 60 percent.
Claim 16
Dependent Claim
38 words
A process according to claim 3 wherein the feedstock is a heavy vacuum gas oil having an API gravity at 60*F of 22.5, a boiling range of 630* to 1,080*F and a total aromatics content of 43 percent.
Claim 17
Dependent Claim
17 words
A process according to claim 4 wherein the catalyst is a sulfided nickel-molybdenum on an alumina support.
Claim 18
Dependent Claim
16 words
A process according to claim 4 wherein the catalyst is sulfided cobalt-molybdenum on an alumina support.
Claim 19
Dependent Claim
15 words
A process according to claim 4 wherein the catalyst is palladium on an alumina support.
Claim 20
Dependent Claim
17 words
A process according to claim 4 wherein the catalyst is a sulfided nickel-tungsten on an alumina support.
Claim 21
Dependent Claim
51 words
A process according to claim 4 wherein the feedstock is a gas oil feedstock having a boiling range within the range of from about 400* to about 1,100*F, an API gravity of from about 18 to about 45 and a total aromatics content of from about 20 to about 60 percent.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |