US4075083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for destructive distillation of hydrocarbonaceous materials
Assignee: Individual
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Filing: 1976-06-11
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Granted: 1978-02-21
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Expires: 1996-06-11
Abstract
Abstract A method of retorting oil shale which comprises the steps of passing the material in particulate form downwardly as a continuous vertical column of solid material successively through a preheating zone, a distillation zone, a combustion zone, and a residue cooling zone. An improved method of product oil recovery is disclosed whereby the vapor product is subjected to sequential treatment with cyclone separators and an absorption column, with a portion of the resulting noncondensible gases being recycled to the retort.
Inventors
- 👤 Maurice W. Putman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:20
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
An improved method for recovering useful liquid products from distillation and combustion products produced by destructive distillation of oil shale and other particulate hydrocarbonaceous material within a gas combustion type of retort and recycling the product gases for use in the retort, the improvement comprising the steps of: a. removing the distillation and combustion products from the retort at a temperature in the range of 110° F to 200° F in the form of a stream containing oil mist, condensible oil vapors, combustible and noncombustible gases; b. recovering oil droplets from the oil mist containing stream by passing the stream removed in step a through at least one high velocity cyclone separator; c. removing condensible hydrocarbons from the stream from which the oil droplets were removed in step b by passage thereof through an absorption column countercurrent to the flow of an absorption oil therethrough; d. recovering the condensible hydrocarbons from said absorption oil by passage thereof through a desorber; e. adding a measured amount of air to a portion of the stream from which the condensible hydrocarbons were removed in step c; and f. directing the stream to which air was added in step e to one end of the retort for flow therethrough countercurrent to the flow of the oil shale and other particulate hydrocarbonaceous materials.
Claim 2
Dependent Claim
218 words
An improved method for recovering useful liquid products from distillation and combustion products produced by destructive distillation of oil shale and other particulate hydrocarbonaceous material within a gas combustion type of retort and recycling the product gases for use in the retort, the improvement comprising the steps of: a. removing the distillation and combustion products from the retort at a temperature in the range of 110° F to 200° F in the form of a stream containing oil mist, condensible oil vapors, combustible and noncombustible gases; b. recovering oil droplets from the oil mist containing stream by passing the stream removed in step a through at least one high velocity cyclone separator; c. removing condensible hydrocarbons from the stream from which the oil droplets were removed in step b by passage thereof through an absorption column countercurrent to the flow of an absorption oil therethrough; d. recovering the condensible hydrocarbons from said absorption oil by passage thereof through a desorber; e. adding a measured amount of air to a portion of the stream from which the condensible hydrocarbons were removed in step c; and f. directing the stream to which air was added in step e to one end of the retort for flow therethrough countercurrent to the flow of the oil shale and other particulate hydrocarbonaceous materials.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said stream emerging from said absorption column of step c contains a maximum of one gallon of normally liquid hydrocarbons per 20,000 SCF of said stream.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said stream emerging from said absorption column of step c contains a maximum of one gallon of normally liquid hydrocarbons per 40,000 SCF of said stream.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein said stream is removed from the retort in step a at a temperature ranging from 110° F to 130° F.
Claim 6
Dependent Claim
23 words
The method of claim 1 including the further step of recycling the absorption oil from said desorber for reuse in said absorption column.
Claim 7
Dependent Claim
23 words
The method of claim 1 including the further step of recovering the condensible hydrocarbons from said desorber by passage thereof through a condenser.
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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |