Patent US3856658A successfully refreshed from Google Patents.
US3856658A
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Slurried solids handling for coal hydrogenation
Assignee: HRI Inc
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Filing: 1973-10-09
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Granted: 1974-12-24
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Expires: 1993-10-09
Abstract
Abstract In the H-Coal process for coal hydrogenation, an initial step is the preparation of a coal slurry for transfer by suitable means into the pressurized reactor. This invention provides an improved method for facilitating such slurry transfer by pumping, and uses a recycled carried liquid to help provide a dilute easily pumpable coal slurry which is pressurized to above reactor pressure and then concentrated in solids content to a desired extent by centrifugal separation means before passing the concentrated slurry to the reaction zone. A clarified liquid stream withdrawn from the slurry concentration step is recirculated back to the mixing step to facilitate the pumping step.
Inventors
- 👤 R Wolk
- 👤 M Chervenak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:14
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A METHOD FOR INTRODUCING PARTICULATE COAL IN LIQUID PHASE SLURRY FORM INTO A HIGH PRESSURE REATION ZONE WHICH COMPRISES: A. MIXING SAID PARTICULATE COAL WITH A HYDROCARBON LIQUID TO PRODUCE A DILUTE SLURRY; B. PRESSURIZING EAID DILUTE SLURRY TO A PRESSURE ABOVE THE REACTION ZONE PRESSURE; C. PASSING SAID PRESSURIZED SLURRY THROUGH LIQUID-SOLID CENTRIFUGAL TYPE SEPARATOR MEANS WITHOUT SUBSTANTIAL LOSS OF PRESSURE TO PRODUCE A CLARIFIED LIQUID PORTION AND A CONCENTRATED SLURRY PORTION; D. RETURNING THE CLARIFIED LIQUID PORTION FROM (C) THROUGH PRESSURE REDUCING MEANS TO THE MIXING STEP (A); AND E. PASSING THE CONCENTRATED SLURRY PORTION OF (C) TO THE HIGH PRESSURE REACTION ZONE.
Claim 2
Independent Claim
105 words
A METHOD FOR INTRODUCING PARTICULATE COAL IN LIQUID PHASE SLURRY FORM INTO A HIGH PRESSURE REATION ZONE WHICH COMPRISES: A. MIXING SAID PARTICULATE COAL WITH A HYDROCARBON LIQUID TO PRODUCE A DILUTE SLURRY; B. PRESSURIZING EAID DILUTE SLURRY TO A PRESSURE ABOVE THE REACTION ZONE PRESSURE; C. PASSING SAID PRESSURIZED SLURRY THROUGH LIQUID-SOLID CENTRIFUGAL TYPE SEPARATOR MEANS WITHOUT SUBSTANTIAL LOSS OF PRESSURE TO PRODUCE A CLARIFIED LIQUID PORTION AND A CONCENTRATED SLURRY PORTION; D. RETURNING THE CLARIFIED LIQUID PORTION FROM (C) THROUGH PRESSURE REDUCING MEANS TO THE MIXING STEP (A); AND E. PASSING THE CONCENTRATED SLURRY PORTION OF (C) TO THE HIGH PRESSURE REACTION ZONE.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the particulate coal solids are smaller than 20 mesh and the slurrying liquid is a light hydrocarbon oil.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the particulate solids are a mixture of coal and catalyst and the liquid is oil.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein the initial slurry is formed under ambient conditions and is pressurized to at least 500 psig and the concentrated slurry is then heated to a temperature of at least 500*F.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the pressure drop across the centrifugal separator means to effect the liquid-solids separation is 50-200 psi.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the slurry of step (b) has a viscosity less than about 10 poise.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the slurry pressurizing means is a positive displacement reciprocating plunger type pump.
Claim 9
Dependent Claim
145 words
A liquid phase catalytic hydroconversion process for converting coal to liquid hydrocarbons and gas which comprises: a. slurry said coal with a hydrocarbon oil boiling above 400*F recovered from the process in a ratio of from 0.5 part of coal per part of oil to 3 parts coal per part of oil at substantially ambient conditions; b. pressurizing said slurry by positive displacement pumping means to a pressure of 1,000-3,000 psig; c. centrifugally separating at least a substantial part of the liquid portion from the coal slurry by centrifugal force means to provide a more concentrated solids slurry portion; d. returning the clarified liquid from step (c) through pressure reducing means to step (a); e. heating the concentrated coal slurry to 600*-950*F; and f. discharging said concentrated heat slurry to a high pressure reaction zone wherein it is converted to hydrocarbon liquid and gas products.
Claim 10
Dependent Claim
145 words
A liquid phase catalytic hydroconversion process for converting coal to liquid hydrocarbons and gas which comprises: a. slurry said coal with a hydrocarbon oil boiling above 400*F recovered from the process in a ratio of from 0.5 part of coal per part of oil to 3 parts coal per part of oil at substantially ambient conditions; b. pressurizing said slurry by positive displacement pumping means to a pressure of 1,000-3,000 psig; c. centrifugally separating at least a substantial part of the liquid portion from the coal slurry by centrifugal force means to provide a more concentrated solids slurry portion; d. returning the clarified liquid from step (c) through pressure reducing means to step (a); e. heating the concentrated coal slurry to 600*-950*F; and f. discharging said concentrated heat slurry to a high pressure reaction zone wherein it is converted to hydrocarbon liquid and gas products.
Claim 11
Dependent Claim
25 words
The process of claim 8 wherein said slurry liquid is a hydrocarbon oil recovered from the process and having a nominal boiling range above 400*F.
Claim 12
Dependent Claim
17 words
The process of claim 8 wherein the pressure reducing means to step (d) is a hydraulic turbine.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |