US4339248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of gaseous effluent from industrial processes
Assignee: PPG Industries Ohio Inc
•
Filing: 1979-11-19
•
Granted: 1982-07-13
•
Expires: 1999-11-19
Abstract
Abstract Described is a process for the purification of gaseous effluent of industrial processes by providing a gas containing at least a hydrocarbon solvent and/or an oxygenated solvent and passing said gas into a gas absorbing means comprised of a nonreactive liquid solvent for said gas, said liquid solvent being liquid and substantially nonvolatile at ambient temperatures and pressures. Preferably, the liquid absorbing solvent is reclaimed by separating the gaseous effluent therefrom. The gaseous effluent is preferably that resulting from the application of paint.
Inventors
- 👤 James W. Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:02
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B05; B05B; B05B14/00; B05B14/40; B05B14/49; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y10; Y10S; Y10S55/00; Y10S55/46
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
130 words
A process for the purification of gaseous effluent resulting from the application of liquid paint comprising the steps: 1. spraying a liquid paint onto a substrate thereby forming a gaseous effluent containing pollutants, said gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent; and 2. in a zone spaced from that in which step 1 is performed, absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-volatile at ambient temperature and pressure, is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen and wherein the liquid absorber is comprised of a polyoxyalkylene glycol.
Claim 2
Dependent Claim
130 words
A process for the purification of gaseous effluent resulting from the application of liquid paint comprising the steps: 1. spraying a liquid paint onto a substrate thereby forming a gaseous effluent containing pollutants, said gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent; and 2. in a zone spaced from that in which step 1 is performed, absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-volatile at ambient temperature and pressure, is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen and wherein the liquid absorber is comprised of a polyoxyalkylene glycol.
Claim 3
Dependent Claim
18 words
The process of claim 2 further comprising re-claiming said gas absorbing means by separating said gaseous effluent therefrom.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein the gaseous effluent contains entrained atomized droplets of a hydrocarbon solvent and an oxygenated solvent, said solvents being solvents for liquid paint.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein 1 liquid absorber has a vapor pressure of less than 1 mm Hg pressure @ 68° F. (20° C.).
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the liquid absorber has a vapor pressure af less than 0.01 mm Hg pressure @ 68° F. (20° C.).
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the liquid absorber is a mixture of a polyoxyalkylene glycol and a dialkyl phthalate.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein the passing of the gas into the gas absorbing means is performed by finely dividing the gas absorbing means and contacting the gaseous effluent with the finely divided gas absorbing means.
Claim 9
Dependent Claim
193 words
A process for the purification of gaseous effluent resulting from the application of liquid paint comprising the steps: 1. spraying a liquid paint onto a substrate thereby forming a gaseous effluent containing pollutants, said gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent; 2. prior to passing the gaseous effluent to the atmosphere, in a zone spaced from that in which step 1 is performed, absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-volatile at ambient temperature and pressure, is substantially water immiscible and contains only the elements carbon, hydrogen oxygen; and 3. thereafter passing the gaseous effluent without the pollutants to the atmosphere, wherein the gaseous effluent pollutants are desorbed from the non-reactive liquid solvent by reclaiming said liquid solvent by separating the abosrbed pollutants therefrom, wherein the pollutant in the gaseous effluent is an oxygenated solvent for the liquid paint and wherein the non-reactive liquid solvent has a vapor pressure of less than 1 mm Hg pressure at 68° F. (20° C.) and is comprised of a polyoxyalkylene glycol.
Claim 10
Dependent Claim
120 words
In a process for the purification of gaseous effluent resulting from the application of liquid paint, wherein liquid paint is applied to a substrate, thereby forming a gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent and prior to passing effluent to the atmosphere, removing the pollutants from the gaseious effluent, the improvement comprising; in a zone spaced from that in which the spraying of the substrate takes place, absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen, wherein the liquid solvent is comprised of a polyoxyalkylene glycol.
Claim 11
Dependent Claim
120 words
In a process for the purification of gaseous effluent resulting from the application of liquid paint, wherein liquid paint is applied to a substrate, thereby forming a gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent and prior to passing effluent to the atmosphere, removing the pollutants from the gaseious effluent, the improvement comprising; in a zone spaced from that in which the spraying of the substrate takes place, absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen, wherein the liquid solvent is comprised of a polyoxyalkylene glycol.
Claim 12
Dependent Claim
18 words
The process of claim 9 further comprising reclaiming said non-reactive liquid solvent by separating said gaseous effluent therefrom.
Claim 13
Dependent Claim
28 words
The process of claim 9 wherein the gaseous effluent contains entrained atomized droplets of a hydrocarbon solvent and an oxygenated solvent, said solvents being solvents for liquid paint.
Claim 14
Dependent Claim
24 words
The process of claim 9 wherein the liquid solvent has a vapor pressure of less than 1 mm Hg at 68° F. (20° C.).
Claim 15
Dependent Claim
24 words
The process of claim 9 wherein the liquid solvent has a vapor pressure of less than 0.01 mm Hg at 68° F. (20° C.).
Claim 16
Dependent Claim
35 words
The process of claim 9 wherein the passing of the gas into the non-reactive liquid solvent is performed by finely dividing the liquid solvent and contacting the gaseous effluent with the finely divided liquid solvent.
Claim 17
Dependent Claim
20 words
The process of claim 9 wherein the liquid solvent is comprised of the reaction product of butanol and propylene oxide.
Claim 18
Dependent Claim
121 words
In a process for the purification of gaseous effluent resulting from the application of liquid paint, wherein liquid paint is applied to a substrate, thereby forming a gaseous effluent containing pollutants, said gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent and prior to passing the effluent to the atmosphere, removing the pollutants from the gaseous effluent, the improvement comprising; absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-volatile at ambient temperature and pressure, is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen, and is a mixture of a polyoxyalkylene glycol and a dialkyl phthalate.
Claim 19
Dependent Claim
121 words
In a process for the purification of gaseous effluent resulting from the application of liquid paint, wherein liquid paint is applied to a substrate, thereby forming a gaseous effluent containing pollutants, said gaseous effluent containing at least a hydrocarbon solvent or an oxygenated solvent and prior to passing the effluent to the atmosphere, removing the pollutants from the gaseous effluent, the improvement comprising; absorbing the pollutants in the gaseous effluent by passing the gaseous effluent into a non-reactive liquid solvent for said gaseous pollutants, wherein said liquid solvent is substantially non-volatile at ambient temperature and pressure, is substantially water immiscible and contains only the elements carbon, hydrogen and oxygen, and is a mixture of a polyoxyalkylene glycol and a dialkyl phthalate.
References Cited (Backward Citations)
DE207554C
Cited
NL15448C
Cited
NL8600C
Cited
US1138081A
Cited
GB129024A
Cited
GB262404A
Cited
US1749920A
Cited
US1966280A
Cited
US2086514A
Cited
US2066913A
Cited
US2188439A
Cited
US2232561A
Cited
DE726287C
Cited
US2289537A
Cited
US2407255A
Cited
US2372085A
Cited
US2395960A
Cited
US2604185A
Cited
US2593548A
Cited
US2575276A
Cited
US2618133A
Cited
US2668150A
Cited
US2694466A
Cited
US3173879A
Cited
US2928498A
Cited
US3170384A
Cited
US3429823A
Cited
US3353800A
Cited
US3551189A
Cited
US3440803A
Cited
US3475202A
Cited
US3599399A
Cited
US3635827A
Cited
SU391842A1
Cited
US3671465A
Cited
US3633340A
Cited
US3667191A
Cited
US3884654A
Cited
US3750622A
Cited
US3985922A
Cited
US3967942A
Cited
US3807291A
Cited
US3873363A
Cited
US3888641A
Cited
US3932151A
Cited
US3867112A
Cited
US3914115A
Cited
US3861887A
Cited
SU498956A1
Cited
US3876399A
Cited
US3880620A
Cited
JPS5110610A
Cited
US3926592A
Cited
FR2289593A1
Cited
DE2451157A1
Cited
US4102303A
Cited
US3985692A
Cited
US4002490A
Cited
US4005997A
Cited
DE2511181C3
Cited
US3965805A
Cited
US4102983A
Cited
US4054429A
Cited
US4067806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |