US3726784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated coal liquefaction and hydrotreating process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-02-18
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Granted: 1973-04-10
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Expires: 1991-02-18
Abstract
Abstract A hydrotreated liquid product from coal is obtained by a process in which liquefaction and hydrotreating zones are operated at essentially the same moderate pressures (1000-2000 psig). Without prior cooling, all the overhead vapor from the liquefaction reactor is admixed with a portion of a light liquid fraction (700* F.) recovered from the liquefaction liquid product, giving a hydrotreating feed having a temperature within a predetermined range. The remaining portion of the light liquid fraction of the liquefaction product is fed to the hydrotreating zone at quench points in the hydrotreating zone downstream from the point of introduction for the admixture, thus utilizing the heats of reaction in the hydrotreating zone to heat the remaining liquid portions (which provide quench to the hydrotreating zone).
Inventors
- 👤 J Correa
- 👤 J Hochman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/042; C10G1/002; C10G1/06; C10G1/065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
The process of claim 1 in which said predetermined range is within the range from about 550* F. to about 750* F. and said specified minimum is within the range from about 5* F. to about 75* F.
Claim 2
Dependent Claim
19 words
The process of claim 2 in which said predetermined range is from about 650* F. to about 700* F.
Claim 3
Dependent Claim
27 words
The process of claim 1 in which the pressure in said liquefaction and hydrogenation zones is within the range from about 1000 psig to about 2000 psig.
Claim 4
Dependent Claim
46 words
The process of claim 1 in which all of said vaporous product is admixed with a stream of hydrogen treat gas and a portion of said liquid product, without prior cooling of said vaporous product, to obtain an admixture having a temperature within said predetermined range.
Claim 5
Dependent Claim
263 words
A process for producing a hydrogenated liquid product from coal, which comprises: in a coal liquefaction zone, liquefying coal slurried in a hydrogen-donor solvent in admixture with from about 1 to about 6 weight percent hydrogen, under liquefaction conditions, to produce a vaporous product, containing from about 1 to about 12 weight percent hydrogen, and a liquid product, including a fraction boiling within the range from about 300* F. to about 700* F.; removing said vaporous product and said liquid product separately from said liquefaction zone; recovering said fraction from said liquid product and splitting said fraction into a plurality of portions; admixing all of said vaporous product with a first portion of said fraction without prior cooling of said vaporous product, to produce an admixture having a temperature in a predetermined range within the range from about 550* F. to about 750* F.; introducing said admixture at said temperature into a hydrogenation zone having essentially the same pressure as said liquefaction zone; introducing a second portion of said fraction into said hydrogenation zone at a location downstream from the inlet for said admixture where the temperaTure of the hydrogenation zone exceeds said temperature within said predetermined range by a specified temperature within the range from about 5* F. to about 75* F., the quantity and temperature of said second portion being correlated with the temperature at said location so as to cool the hydrogenation zone downstream from said location to a temperature within said predetermined range; removing the effluent from said hydrogenation zone; and recovering the hydrotreated liquid product from said effluent.
Claim 6
Dependent Claim
50 words
The process of claim 6 further comprising: recovering a hydrogen treat gas from said effluent, and admixing said vaporous product with said hydrogen treat gas and said first portion of said fraction, without prior cooling of said vaporous product, to obtain said admixture having a temperature within said predetermined range.
Claim 7
Dependent Claim
27 words
The process of claim 6 in which the pressure in said liquefaction and hydrogenation zones is within the range from about 1000 psig to about 2000 psig.
Claim 8
Dependent Claim
38 words
The process of claim 8 in which said liquefaction conditions further include a temperature within the range from about 750* F. to about 850* F. and a liquid residence time of from about 5 to about 60 minutes.
Claim 9
Dependent Claim
19 words
The process of claim 5 in which said predetermined range is from about 650* F. to about 700* F.
Claim 10
Dependent Claim
325 words
A process for producing a hydrogenated liquid product from coal, which comprises: in a coal liquefaction zone, liquefying coal slurried in a hydrogen-donor solvent in admixture from about 1 to about 6 weight percent hydrogen, under liquefaction conditions including a pressure within the range from about 1000 psig to about 2000 psig, a temperature within the range from about 750* F. to about 850* F., and a liquid residence time of from about 5 to about 60 minutes, to produce a vaporous product containing from about 1 to about 12 weight percent hydrogen, and a liquid product including a fraction boiling within the range from about 300* F. to about 700* F.; removing said vaporous product and said liquid product separately from said liquefaction zone, recovering said fraction from said liquid product and splitting said fraction into a plurality of portions; admixing all of said vaporous product with a recycle stream of hydrogen treat gas and a first portion of said fraction, without prior cooling of said vaporous product, to obtain an admixture having a temperature within a predetermined range from about 650* F. to about 700* F.; introducing said admixture at said temperature into a hydrogenation zone having essentially the same pressure as said liquefaction zone; introducing a second portion of said fraction into said hydrogenation zone at a location downstream from the point of introduction of said admixture where the temperature of the hydrogenation zone exceeds said temperature within said predetermined range by a specified maximum within the range from about 5* F. to about 75* F., the quantity and temperature of said second portion being correlated with the temperature at said location so as to cool the hydrogenation zone downstream from said location to a temperature within said predetermined range; removing the effluent from said hydrogenation zone; recovering the hydrotreated liquid product and the hydrogen treat gas from said effluent; and recycling the hydrogen treat gas for admixture with said vaporous product.
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |