US4000993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for scrubbing gas streams
Assignee: Micron Engineering Inc
•
Filing: 1975-11-10
•
Granted: 1977-01-04
•
Expires: 1995-11-10
Abstract
Abstract In a process for scrubbing contaminant gas and/or solids and/or liquids from a gas stream by diffusiophoretic action hydrogen chloride is used as the diffusiophoretic scrubbing component. The hydrogen chloride may be used per se, may be formed in situ, or may be obtained from fuming hydrochloric acid. Certain contaminants may require the use of formaldehyde to combine with them and produce an easily-removable compound. The scrubbing liquid is usually water, although an alkaline solution may be employed to neutralize the acid. The process has high efficiency with very fine particles (less than 1 micron), odours and sub-micron smokes.
Inventors
- 👤 Richard Adolf Holl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:32
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D47/00; B01D47/06
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
84 words
A process for the diffusiophoretic scrubbing of a carrier gas stream to remove contaminant material therefrom including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride, and thereafter passing the carrier gas stream and entrained scrubbing and contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the contaminant material from the gas stream.
Claim 2
Dependent Claim
84 words
A process for the diffusiophoretic scrubbing of a carrier gas stream to remove contaminant material therefrom including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride, and thereafter passing the carrier gas stream and entrained scrubbing and contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the contaminant material from the gas stream.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, wherein the hydrogen chloride is obtained from hydrochloric acid solution.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 2, wherein the partial pressure of the hydrogen chloride in the solution is above 10 mm mercury.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1, wherein the partial pressure of the hydrogen chloride in the scrubbing liquid after scrubbing is less than 0.1 mm mercury.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 2, wherein the hydrochloric acid is of concentration from 30% to 32% and is of the temperature from 80° C to 120° C.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1, wherein the hydrogen chloride is obtained by the combustion of hydrogen and chlorine.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 1, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times by weight of the contaminant material.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 1, wherein the scrubbing liquid is an alkaline solution for absorption of the hydrogen chloride.
Claim 10
Dependent Claim
56 words
A process for the removal of hydrocarbon vapours from a gas stream including the preliminary step of absorbing the bulk of the hydrocarbon vapours from the gas stream with a hydrocarbon solvent, and thereafter scrubbing the gas stream by the process of claim 1 for removal of the hydrocarbon tail gases and the entrained hydrocarbon solvent.
Claim 11
Dependent Claim
20 words
A process as claimed in claim 9, and including the step of recovering the hydrocarbon vapour from the hydrocarbon solvent.
Claim 12
Dependent Claim
90 words
A process for the diffusiophoretic scrubbing of a carrier gas stream containing finely-divided solid contaminant material to be removed therefrom, including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride, and thereafter passing the carrier gas stream and entrained scrubbing and solid contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the finely-divided contaminant material from the gas stream.
Claim 13
Dependent Claim
90 words
A process for the diffusiophoretic scrubbing of a carrier gas stream containing finely-divided solid contaminant material to be removed therefrom, including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride, and thereafter passing the carrier gas stream and entrained scrubbing and solid contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the finely-divided contaminant material from the gas stream.
Claim 14
Dependent Claim
17 words
A process as claimed in claim 11, wherein the hydrogen chloride is obtained from hydrochloric acid solution.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 12, wherein the partial pressure of the hydrogen chloride in the solution is above 10 mm mercury.
Claim 16
Dependent Claim
29 words
A process as claimed in claim 12, wherein the hydrochloric acid is of concentration from 30% to 32% and is of the temperature from 80° C to 120° C.
Claim 17
Dependent Claim
27 words
A process as claimed in claim 11, wherein the partial pressure of the hydrogen chloride in the scrubbing liquid after scrubbing is less than 0.1 mm mercury.
Claim 18
Dependent Claim
20 words
A process as claimed in claim 11, wherein the hydrogen chloride is obtained by the combustion of hydrogen and chlorine.
Claim 19
Dependent Claim
28 words
A process as claimed in claim 11, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times by weight of the contaminant material.
Claim 20
Dependent Claim
21 words
A process as claimed in claim 11, wherein the scrubbing liquid is an alkaline solution for absorption of the hydrogen chloride.
Claim 21
Dependent Claim
86 words
A process for the diffusiophoretic scrubbing of a carrier gas stream to remove contaminant material therefrom including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride and formaldehyde, and thereafter passing the carrier gas stream and entrained scrubbing and contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the contaminant material from the gas stream.
Claim 22
Dependent Claim
86 words
A process for the diffusiophoretic scrubbing of a carrier gas stream to remove contaminant material therefrom including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride and formaldehyde, and thereafter passing the carrier gas stream and entrained scrubbing and contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the contaminant material from the gas stream.
Claim 23
Dependent Claim
41 words
A process as claimed in claim 19, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times, and the formaldehyde is in the amount of 1.5 to 2 times, both by weight of the contaminant material.
Claim 24
Dependent Claim
17 words
A process as claimed in claim 19, wherein the hydrogen chloride is obtained from hydrochloric acid solution.
Claim 25
Dependent Claim
23 words
A process as claimed in claim 21, wherein the partial pressure of the hydrogen chloride in the solution is above 10 mm mercury.
Claim 26
Dependent Claim
29 words
A process as claimed in claim 21, wherein the hydrochloric acid is of concentration from 30% to 32% and is of the temperature from 80° C to 120° C.
Claim 27
Dependent Claim
27 words
A process as claimed in claim 19, wherein the partial pressure of the hydrogen chloride in the scrubbing liquid after scrubbing is less than 0.1 mm mercury.
Claim 28
Dependent Claim
20 words
A process as claimed in claim 19, wherein the hydrogen chloride is obtained by the combustion of hydrogen and chlorine.
Claim 29
Dependent Claim
28 words
A process as claimed in claim 19, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times by weight of the contaminant material.
Claim 30
Dependent Claim
21 words
A process as claimed in claim 19, wherein the scrubbing liquid is an alkaline solution for absorption of the hydrogen chloride.
Claim 31
Dependent Claim
56 words
A process for the removal of hydrocarbon vapours from a gas stream including the preliminary step of absorbing the bulk of the hydrocarbon vapours from the gas stream with a hydrocarbon solvent, and thereafter scrubbing the gas stream by the process of claim 21 for removal of the hydrocarbon tail gases and the entrained hydrocarbon solvent.
Claim 32
Dependent Claim
20 words
A process as claimed in claim 28, and including the step of recovering the hydrocarbon vapour from the hydrocarbon solvent.
Claim 33
Dependent Claim
92 words
A process for the diffusiophoretic scrubbing of a carrier gas stream containing finely-divided solid contaminant material to be removed therefrom, including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride and formaldehyde, and thereafter passing the carrier gas stream and entrained scrubbing and solid contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the finely-divided contaminant material from the gas stream.
Claim 34
Dependent Claim
92 words
A process for the diffusiophoretic scrubbing of a carrier gas stream containing finely-divided solid contaminant material to be removed therefrom, including the step of discharging into the gas stream a scrubbing material consisting of hydrogen chloride and formaldehyde, and thereafter passing the carrier gas stream and entrained scrubbing and solid contaminant materials through a space in which the gas stream is scrubbed with an aqueous scrubbing liquid such that diffusiophoretic absorption of the scrubbing material into the aqueous scrubbing liquid takes place to scrub the finely-divided contaminant material from the gas stream.
Claim 35
Dependent Claim
41 words
A process as claimed in claim 30, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times, and the formaldehyde is in the amount of 1.5 to 2 times, both by weight of the contaminant material.
Claim 36
Dependent Claim
17 words
A process as claimed in claim 30, wherein the hydrogen chloride is obtained from hydrochloric acid solution.
Claim 37
Dependent Claim
23 words
A process as claimed in claim 32, wherein the partial pressure of the hydrogen chloride in the solution is above 10 mm mercury.
Claim 38
Dependent Claim
29 words
A process as claimed in claim 32, wherein the hydrochloric acid is of concentration from 30% to 32% and is of the temperature from 80° C to 120° C.
Claim 39
Dependent Claim
27 words
A process as claimed in claim 30, wherein the partial pressure of the hydrogen chloride in the scrubbing liquid after scrubbing is less than 0.1 mm mercury.
Claim 40
Dependent Claim
20 words
A process as claimed in claim 30, wherein the hydrogen chloride is obtained by the combustion of hydrogen and chlorine.
Claim 41
Dependent Claim
28 words
A process as claimed in claim 30, wherein the available hydrogen chloride is in the amount of from 1.5 to 4 times by weight of the contaminant material.
Claim 42
Dependent Claim
21 words
A process as claimed in claim 30, wherein the scrubbing liquid is an alkaline solution for absorption of the hydrogen chloride.
References Cited (Backward Citations)
US2127571A
Cited
US3284992A
Cited
US3789109A
Cited
US3690041A
Cited
US3807139A
Cited
US3844879A
Cited
US3870082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |