Patent US4378235A successfully refreshed from Google Patents.
US4378235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scrubbing media for removing volatile organic material from paint spray booths
Assignee: Ecolab USA Inc
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Filing: 1981-10-05
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Granted: 1983-03-29
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Expires: 2001-10-05
Abstract
Abstract An improved method for recovering volatile organic paint carrier from paint spray booths of the type comprising a chamber, a duct system for passing air down through such chamber to remove volatile organic paint carrier and over-sprayed paint particles, a sump containing a circulating hydrophilic liquid located at the bottom of the chamber adapted to remove volatile organic paint carrier and paint particles from the air containing them, the improvement which comprises using as the hydrophilic liquid an oil-in-water emulsion which has the following composition: (a) 1-50% by weight of an organic liquid having a boiling point of at least 150°C.; (b) 0.1-30% by weight of the organic liquid of a sulfonate-free oil-in-water emulsifier; (c) balance, water, said emulsion having a pH within the range of 7.5-12.0 and being further characterized as being rapidly broken when the pH is reduced below 6.5.
Inventors
- 👤 David R. Cosper
- 👤 William H. Lindenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:27
CPC Classifications
B; B01; B01D; B01D47/00; C; C09; C09D; C09D7/00; C09D7/71
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
In an improved method for recovering volatile organic paint carrier from paint spray booths of the type comprising a chamber, a duct system for passing air down through such chamber to remove volatile organic paint carrier and over-sprayed particles, a sump containing a circulating hydrophilic liquid located at the bottom of the chamber removing volatile organic paint carrier and paint particles from the air containing them, the improvement which comprises using as the hydrophilic liquid in the sump of the spray booth an oil-in-water emulsion maintained at a pH value of from 7.5-12 which has the following composition: (a) 1-50% by weight of an organic liquid having a boiling point of at least 150° C.; (b) 0.1-30% by weight of the organic liquid of a sulfonate-free oil-in-water emulsifier; (c) balance, water, said emulsion being rapidly broken into a separate oil phase and a separate aqueous phase by adjusting the pH of the emulsion to below 6.5 and recovering the volatile organic paint carrier from the oil phase reforming the emulsion by the oil phase and aqueous phase combining at a pH of 7.5-12.
Claim 2
Dependent Claim
183 words
In an improved method for recovering volatile organic paint carrier from paint spray booths of the type comprising a chamber, a duct system for passing air down through such chamber to remove volatile organic paint carrier and over-sprayed particles, a sump containing a circulating hydrophilic liquid located at the bottom of the chamber removing volatile organic paint carrier and paint particles from the air containing them, the improvement which comprises using as the hydrophilic liquid in the sump of the spray booth an oil-in-water emulsion maintained at a pH value of from 7.5-12 which has the following composition: (a) 1-50% by weight of an organic liquid having a boiling point of at least 150° C.; (b) 0.1-30% by weight of the organic liquid of a sulfonate-free oil-in-water emulsifier; (c) balance, water, said emulsion being rapidly broken into a separate oil phase and a separate aqueous phase by adjusting the pH of the emulsion to below 6.5 and recovering the volatile organic paint carrier from the oil phase reforming the emulsion by the oil phase and aqueous phase combining at a pH of 7.5-12.
Claim 3
Dependent Claim
42 words
The oil-in-water emulsion of claim 1 wherein the oil-in-water emulsion comprises 4-30% by weight of an organic liquid having a boiling point of at least 300° C.; 1.5-10% by weight of the organic liquid of a sulfonate-free oil-in-water emulsifier; and balance, water.
Claim 4
Dependent Claim
25 words
The oil-in-water emulsion of claim 2, wherein the oil-in-water emulsifier is oleic acid and the organic liquid is a 100 SEC primarily aliphatic process oil.
Claim 5
Dependent Claim
19 words
The oil-in-water emulsion of claim 1, wherein the organic liquid has a boiling point of at least 300° C.
Claim 6
Dependent Claim
29 words
The oil-in-water emulsion of claim 1, wherein the emulsifier for the oil-in-water emulsion is selected from the group consisting of C 12 -C 30 saturated and unsaturated fatty acids.
Claim 7
Dependent Claim
36 words
The oil-in-water emulsion of claim 5, wherein the oil-in-water emulsion has a pH in the range of 8-11 and is rapidly broken when the pH of the emulsion is reduced to a value of from 3.0-6.
Claim 8
Dependent Claim
25 words
The oil-in-water emulsion of claim 6, wherein the oil-in-water emulsifier is oleic acid and the organic liquid is a 100 SEC primarily aliphatic process oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |