US4324935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special conditions for the hydrogenation of heavy hydrocarbons
Assignee: Linde GmbH
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Filing: 1980-10-16
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Granted: 1982-04-13
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Expires: 2000-10-16
Abstract
Abstract For thermally cracking heavy liquid hydrocarbons to produce gaseous olefins comprising a catalytic hydrogenating pretreatment, a separation of the hydrogenation product into a lighter fraction and a heavier fraction; passing the heavier fraction at least in part to a thermal cracking step to produce normally gaseous olefins; and withdrawing the lighter fraction, the improvement wherein the hydrogenation is conducted within the shaded area of FIG. 2, whereby said lighter fraction has a higher octane number.
Inventors
- 👤 Hans J. Wernicke
- 👤 Claus Schliebener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:03
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
In a process for the cracking of heavy liquid hydrocarbons comprising monoaromatics and polyaromatics, said process comprising a catalytic hydrogenating pretreatment of said heavy hydrocarbons, separating hydrogenation product into a lighter fraction containing the major portion of the monoaromatics and a heavier fraction; passing the heavier fraction at least in part to a thermal cracking step to produce normally gaseous olefins; and withdrawing the lighter fraction, the improvement wherein hydrogenation is conducted within the shaded area of FIG. 2, wherein at temperatures of between 350° and 450° C., the hydrogen partial pressure and the hydrogenation temperature are selected so that their values in a hydrogen partial pressure-temperature diagram lie within the area bounded by the curve having the corner coordinates 350° C./5 bar; 350° C./15 bar; 400° C./40 bar; 450° C./100 bar; 450° C./20 bar; and 400° C./10 bar, whereby said lighter fraction has a higher octane number.
Claim 2
Dependent Claim
148 words
In a process for the cracking of heavy liquid hydrocarbons comprising monoaromatics and polyaromatics, said process comprising a catalytic hydrogenating pretreatment of said heavy hydrocarbons, separating hydrogenation product into a lighter fraction containing the major portion of the monoaromatics and a heavier fraction; passing the heavier fraction at least in part to a thermal cracking step to produce normally gaseous olefins; and withdrawing the lighter fraction, the improvement wherein hydrogenation is conducted within the shaded area of FIG. 2, wherein at temperatures of between 350° and 450° C., the hydrogen partial pressure and the hydrogenation temperature are selected so that their values in a hydrogen partial pressure-temperature diagram lie within the area bounded by the curve having the corner coordinates 350° C./5 bar; 350° C./15 bar; 400° C./40 bar; 450° C./100 bar; 450° C./20 bar; and 400° C./10 bar, whereby said lighter fraction has a higher octane number.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the hydrogenation is conducted at between 380° and 420° C.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein the heavier fraction consists of the components of the hydrogenation product boiling above 200° C.
Claim 5
Dependent Claim
36 words
A process according to claim 1, wherein the heavier fraction of the hydrogenation product is fractionated into an intermediate distillate fraction fed to the thermal cracking stage, and into a hydrogenation residue recycled into the hydrogenation.
Claim 6
Dependent Claim
22 words
A process according to claim 4, wherein the hydrogenation residue consists of the components of the hydrogenation product boiling above 340° C.
Claim 7
Dependent Claim
59 words
A process according to claim 1, wherein the hydrogenation products are fractionated into a lighter fraction being a gasoline boiling below about 180° C.; a kerosine fraction boiling between about 180° and about 230° C.; an intermediate distillate fraction; and a residue fraction, wherein the intermediate distillate fraction and/or the residue fraction are fed to the thermal cracking stage.
Claim 8
Dependent Claim
28 words
A process according to claim 1, wherein the lighter fraction is a gasoline fraction boiling below 200° C. and having a research octane number of at least 85.
Claim 9
Dependent Claim
28 words
A process according to claim 1, wherein the lighter fraction is a gasoline fraction boiling below 180° C. and having a research octane number of at least 85.
Claim 10
Dependent Claim
21 words
A process according to claim 1, wherein the heavy liquid hydrocarbons subjected to the hydrogenating treatment comprise a vacuum gas oil.
Claim 11
Dependent Claim
23 words
A process according to claim 9, wherein less than 25% by weight of the vacuum gas oil feed is formed into pyrolysis oil.
Claim 12
Dependent Claim
105 words
A process for catalytically hydrogenating heavy liquid hydrocarbon boiling above 200° C. comprising conducting the hydrogenation within the shaded area of FIG. 2, wherein at temperatures of between 350° and 450° C., the hydrogen partial pressure and the hydrogenation temperature are selected so that their values in a hydrogen partial pressure-temperature diagram lie within the area bounded by the curve having the corner coordinates 350° C./5 bar; 350° C./15 bar; 400° C./40 bar; 450° C./100 bar; 450° C./20 bar; and 400° C./10 bar, the resultant product containing a gasoline cut having a research octane number of at least 85 for direct use as motor fuel.
Claim 13
Dependent Claim
105 words
A process for catalytically hydrogenating heavy liquid hydrocarbon boiling above 200° C. comprising conducting the hydrogenation within the shaded area of FIG. 2, wherein at temperatures of between 350° and 450° C., the hydrogen partial pressure and the hydrogenation temperature are selected so that their values in a hydrogen partial pressure-temperature diagram lie within the area bounded by the curve having the corner coordinates 350° C./5 bar; 350° C./15 bar; 400° C./40 bar; 450° C./100 bar; 450° C./20 bar; and 400° C./10 bar, the resultant product containing a gasoline cut having a research octane number of at least 85 for direct use as motor fuel.
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 |