US4257871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of vacuum residue in thermal cracking
Assignee: Linde GmbH
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Filing: 1979-10-09
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Granted: 1981-03-24
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Expires: 1999-10-09
Abstract
Abstract Vacuum residue is used for production of olefins by first separating, preferably by solvent extraction, the asphalt therein, blending resultant asphalt depleted fraction with a lighter fraction, e.g., a vacuum gas oil, and then subjecting the blend to a conventional catalytic hydrogenation step prior to thermal cracking. The hydrogenate may be separated into fractions with the heavy fraction only being thermally cracked.
Inventors
- 👤 Hans J. Wernicke
- 👤 Klaus D. Mikulla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:41
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
In a process comprising subjecting a normally liquid hydrocarbon mixture to a hydrogenation treatment and to a subsequent thermal cracking step to produce normally gaseous olefins, the improvement which comprises employing as said normally liquid hydrocarbon mixture a blend of substantially asphalt-free vacuum residue having an initial boiling point of at least about 520° C. with a hydrocarbon blending agent having a lower initial boiling point than said substantially asphalt-free vacuum residue, both said substantially asphalt-free vacuum residue and said hydrocarbon blending agent being derived from an atmospheric residue.
Claim 2
Dependent Claim
89 words
In a process comprising subjecting a normally liquid hydrocarbon mixture to a hydrogenation treatment and to a subsequent thermal cracking step to produce normally gaseous olefins, the improvement which comprises employing as said normally liquid hydrocarbon mixture a blend of substantially asphalt-free vacuum residue having an initial boiling point of at least about 520° C. with a hydrocarbon blending agent having a lower initial boiling point than said substantially asphalt-free vacuum residue, both said substantially asphalt-free vacuum residue and said hydrocarbon blending agent being derived from an atmospheric residue.
Claim 3
Dependent Claim
40 words
A process according to claim 1, wherein the substantially asphalt-free vacuum residue is produced by solvent extracting a vacuum residue with a nonpolar solvent made up of C 3 -, C 4 -, C 5 -, or C 6 -hydrocarbons.
Claim 4
Dependent Claim
29 words
A process according to claim 2, wherein in case of high concentrations of heavy metals and/or asphalt components in the vacuum residue, a C 3 -hydrocarbon solvent is employed.
Claim 5
Dependent Claim
23 words
A process according to claim 2, wherein at low concentrations of heavy metals and/or asphalt components, a C 6 -hydrocarbon solvent is employed.
Claim 6
Dependent Claim
39 words
A process according to claim 2, wherein at medium concentrations of heavy metals and/or asphaltic components, a C 4 - or C 5 -hydrocarbon or mixtures of C 3 - to C 6 -hydrocarbons are utilized as the solvent.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the hydrocarbon blending agent is a vacuum gas oil.
Claim 8
Dependent Claim
29 words
A process according to claim 1, wherein the blend contains not more than about 0.05% by weight of asphaltic materials and not more than about 3 ppm of vanadium.
Claim 9
Dependent Claim
16 words
A process according to claim 7, wherein the hydrocarbon blending agent is a vacuum gas oil.
Claim 10
Dependent Claim
25 words
A process according to claim 1, wherein the weight ratio of said blending agent to said substantially asphalt-free vacuum residue is 2:1 to 4:1, respectively.
Claim 11
Dependent Claim
25 words
A process according to claim 6, wherein the weight ratio of said blending agent to said substantially asphalt-free vacuum residue is 2:1 to 4:1, respectively.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |