US3977846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-pollution method
Assignee: Alcoa Corp
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Filing: 1973-08-20
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Granted: 1976-08-31
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Expires: 1993-08-20
Abstract
Abstract Use of a temperature-controlled heat-exchanger comprising fluidized particles to remove hydrocarbons from gas contaminated therewith and prevent hydrocarbon pollution of the atmosphere.
Inventors
- 👤 Allen S. Russell
- 👤 Noel Jarrett
- 👤 Marshall J. Bruno
- 👤 John A. Remper
- 👤 Larry K. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:57
CPC Classifications
B; B01; B01D; B01D57/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A process for the prevention of pollution by the removal of undesirable hydrocarbons from a gas which comprises: a. fluidizing solid particles with a fluidizing medium substantially free of hydrocarbons depositable on the particles; b. cooling the particles to a temperature not exceeding the condensation temperature of said hydrocarbons; c. introducing said hydrocarbon-contaminated gas at a point spaced from the entry point of said fluidizing medium and at a temperature exceeding the condensation temperature of said hydrocarbons; and d. removing said hydrocarbons from said contaminated gas through deposition on said particles.
Claim 2
Dependent Claim
91 words
A process for the prevention of pollution by the removal of undesirable hydrocarbons from a gas which comprises: a. fluidizing solid particles with a fluidizing medium substantially free of hydrocarbons depositable on the particles; b. cooling the particles to a temperature not exceeding the condensation temperature of said hydrocarbons; c. introducing said hydrocarbon-contaminated gas at a point spaced from the entry point of said fluidizing medium and at a temperature exceeding the condensation temperature of said hydrocarbons; and d. removing said hydrocarbons from said contaminated gas through deposition on said particles.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the solid particles are selected from the group consisting of alumina, carbon and sand.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the solid particles comprise alumina.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the fluidized particles are maintained at a temperature of less than about 125°C.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the fluidized particles are maintained at a temperature of from about 35°C to about 80°C.
Claim 7
Dependent Claim
49 words
The process of claim 1 wherein said hydrocarbon-contaminated gas is introduced through a nozzle having an outlet spaced from the wall of the heat exchanger chamber containing said fluidized particles and is maintained at a temperature above the condensation temperature of said hydrocarbons by heating or insulating said nozzle.
Claim 8
Dependent Claim
39 words
The process of claim 1 wherein said particles are fluidized by passing said fluidizing medium through openings in a distribution plate beneath the solid particles and said fluidizing medium is essentially free of material condensable on said distribution plate.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said contaminated gas is introduced into the zone of fluidized particles at a velocity sufficient to prevent counterflow of the particles.
Claim 10
Dependent Claim
118 words
A process for the removal of undesirable hydrocarbons from a gas contaminated therewith comprising: a. fluidizing a bed of alumina particles with a substantially hydrocarbon-free gas introduced into said bed through a distribution plate at a predetermined fluidizing velocity; b. cooling the bed to a temperature of less than about 125°C; c. introducing said hydrocarbon-contaminated gas at a point spaced from said distribution plate through a nozzle maintained at a temperature above the condensation temperature of said hydrocarbons by heating or insulating said nozzle, said gas being introduced into the zone of fluidized particles at a velocity sufficient to prevent counterflow of the particles; d. removing said hydrocarbons from said contaminated gas through deposition on said alumina particles.
Claim 11
Dependent Claim
118 words
A process for the removal of undesirable hydrocarbons from a gas contaminated therewith comprising: a. fluidizing a bed of alumina particles with a substantially hydrocarbon-free gas introduced into said bed through a distribution plate at a predetermined fluidizing velocity; b. cooling the bed to a temperature of less than about 125°C; c. introducing said hydrocarbon-contaminated gas at a point spaced from said distribution plate through a nozzle maintained at a temperature above the condensation temperature of said hydrocarbons by heating or insulating said nozzle, said gas being introduced into the zone of fluidized particles at a velocity sufficient to prevent counterflow of the particles; d. removing said hydrocarbons from said contaminated gas through deposition on said alumina particles.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |