US4444573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrotropes and uses thereof
Assignee: ChampionX LLC
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Filing: 1982-06-21
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Granted: 1984-04-24
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Expires: 2002-06-21
Abstract
Abstract A method for using an aqueous hydrotrope solution to remove at least a portion of a solvent from a stream of air containing the solvent, wherein the method comprises introducing the stream of air containing the solvent into a scrubber containing an effective amount of the aqueous hydrotrope solution, and contacting of the stream of air containing the solvent with the aqueous hydrotrope solution thereby producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous hydrotrope solution and the solvent.
Inventors
- 👤 David R. Cosper
- 👤 Gretchen L. McKay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
A method for using an aqueous hydrotrope solution to recover continuously at least a portion of an organic solvent from a stream of air containing the solvent, the method comprising the steps of: (a) continuously introducing the stream of air containing the solvent into a scrubber and simultaneously adding thereinto the aqueous hydrotrope solution while simultaneously contacting the stream of air containing the solvent with the aqueous hydrotrope solution, thereby continuously producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous hydrotrope solution and the solvent; (b) then continuously introducing the second scrubber product stream into an extractor while simultaneously adding thereinto an organic oil, thereby producing a first extractor product stream containing a recovered form of the aqueous hydrotrope solution, the solvent thereby having been removed substantially from the first extractor product stream, and a second extractor product stream containing the organic oil and the solvent; and (c) then continuously introducing the second extractor product stream into a stripper while simultaneously adding thereinto a sufficient amount of steam for producing a first stripper product stream containing a recovered form of the organic oil, the solvent thereby having been removed substantially from the first stripper product stream, and a second stripper product stream containing the solvent.
Claim 2
Independent Claim
214 words
A method for using an aqueous hydrotrope solution to recover continuously at least a portion of an organic solvent from a stream of air containing the solvent, the method comprising the steps of: (a) continuously introducing the stream of air containing the solvent into a scrubber and simultaneously adding thereinto the aqueous hydrotrope solution while simultaneously contacting the stream of air containing the solvent with the aqueous hydrotrope solution, thereby continuously producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous hydrotrope solution and the solvent; (b) then continuously introducing the second scrubber product stream into an extractor while simultaneously adding thereinto an organic oil, thereby producing a first extractor product stream containing a recovered form of the aqueous hydrotrope solution, the solvent thereby having been removed substantially from the first extractor product stream, and a second extractor product stream containing the organic oil and the solvent; and (c) then continuously introducing the second extractor product stream into a stripper while simultaneously adding thereinto a sufficient amount of steam for producing a first stripper product stream containing a recovered form of the organic oil, the solvent thereby having been removed substantially from the first stripper product stream, and a second stripper product stream containing the solvent.
Claim 3
Dependent Claim
23 words
The method of claim 1 including the step of recovering at least a portion of said solvent from said second stripper product stream.
Claim 4
Independent Claim
239 words
A method for using an aqueous hydrotrope solution to reduce continuously an organic solvent vapor emission from a paint spray booth, the method comprising the steps of: (a) introducing a stream of air containing the solvent vapor emission into a scrubber and simultaneously adding thereinto an effective amount of the aqueous hydrotrope solution while contacting the stream of air with the aqueous hydrotrope solution, thereby producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous-hydrotrope solution and the solvent; (b) then introducing the second scrubber product stream into a liquid-liquid extractor while simultaneously adding an effective amount of an organic oil, thereby producing a first extractor product stream containing a recovered form of the aqueous hydrotrope solution, the solvent thereby having been removed substantially from the first extractor product stream, and a second extractor product stream containing the organic oil and the solvent; (c) then introducing the second extractor product stream into a steam stripper while simultaneously adding thereinto a sufficient amount of steam for producing a first stripper product stream containing a recovered form of the organic oil, the solvent thereby having been removed substantially from the first stripper product stream, and a second stripper product stream containing the steam and the solvent; and, (d) then introducing the steam of the second stripper product stream into a condenser, thereby producing a first condenser product stream containing water and the solvent.
Claim 5
Independent Claim
239 words
A method for using an aqueous hydrotrope solution to reduce continuously an organic solvent vapor emission from a paint spray booth, the method comprising the steps of: (a) introducing a stream of air containing the solvent vapor emission into a scrubber and simultaneously adding thereinto an effective amount of the aqueous hydrotrope solution while contacting the stream of air with the aqueous hydrotrope solution, thereby producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous-hydrotrope solution and the solvent; (b) then introducing the second scrubber product stream into a liquid-liquid extractor while simultaneously adding an effective amount of an organic oil, thereby producing a first extractor product stream containing a recovered form of the aqueous hydrotrope solution, the solvent thereby having been removed substantially from the first extractor product stream, and a second extractor product stream containing the organic oil and the solvent; (c) then introducing the second extractor product stream into a steam stripper while simultaneously adding thereinto a sufficient amount of steam for producing a first stripper product stream containing a recovered form of the organic oil, the solvent thereby having been removed substantially from the first stripper product stream, and a second stripper product stream containing the steam and the solvent; and, (d) then introducing the steam of the second stripper product stream into a condenser, thereby producing a first condenser product stream containing water and the solvent.
Claim 6
Dependent Claim
67 words
The method of claim 3 wherein said organic oil has a density at about 25 degrees Centigrade of between about 0.829 and about 0.839 grams per cubic centimeter, a flash point of no less than 177 degrees Centigrade, a pour point of no more than negative 7 degrees Centigrade, and a viscosity at about 100 degrees Fahrenheit of between about 62 and about 68 Saybolt Universal Seconds.
Claim 7
Dependent Claim
63 words
The method of claim 4 wherein said organic oil has a density at about 15 degrees Centigrade of about 0.907 grams per cubic centimeter, a flash point of no less than 160 degrees Centigrade, a pour point of no more than negative 18 degrees Centigrade, and a viscosity at about 100 degrees Fahrenheit of between about 105 and about 115 Saybolt Universal Seconds.
Claim 8
Dependent Claim
53 words
The method of claim 4 wherein said organic oil has a density at about 25 degrees Centigrade of about 0.846 grams per cubic centimeter, a flash point of about 360 degrees Fahrenheit, a pour point of 15 degrees Fahrenheit, and a viscosity at about 100 degrees Fahrenheit of about 89 Saybolt Universal Seconds.
Claim 9
Dependent Claim
17 words
The method of claim 5 or claim 6 or claim 4 wherein said organic oil is emulsified.
Claim 10
Dependent Claim
32 words
The method of claim 5 or claim 6 or claim 4 wherein said hydrotropic substance is selected from the group consisting of sodium octanoate, sodium hexanoate, sodium cumenesulfonate, and sodium xylenesulfonate polar.
Claim 11
Dependent Claim
10 words
The method of claim 8 wherein said solvent is toluene.
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |