US3918935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-newtonian liquid and method for wet scrubbing stack gases
Assignee: Factory Mutual Research Corp
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Filing: 1973-08-13
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Granted: 1975-11-11
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Expires: 1993-08-13
Abstract
Abstract A non-Newtonian scrubbing liquid for use in wet scrubbing pollutants from flue gases. The liquid comprises water, a polymeric additive material, preferably one that will complex when contacted with a bi- or trivalent salt, and lime or limestone. The size and stability of droplets formed in spraying such a liquid may be controlled so that they will penetrate a countercurrent of effluent gases. In so doing, the droplets will entrain particulates, including fly ash or sulfides resulting from the reaction of sulfur dioxide gases in the effluent and the lime or limestone, and form a sludge at the bottom of an apparatus. When contacted with a complexing salt, such as borax, the polymeric material in the sludge forms a fishnet structure which entrains the solids but contracts and releases water therefrom.
Inventors
- 👤 William L Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D53/00; B01D53/14; B01D53/1493
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A PROCESS FOR REMOVING POLLUTANTS FROM A CURRENT OF GASEOUS WASTES WHICH COMPRISES, PROVIDING A NON-NEWTONIAN SCRUBBING LIQUID CONTAINING WATER, AN ALKALINE HYDROXIDE OR CARBONATE, AND A COMPLEXIBLE POLYMERIC MATERIAL, SPARYING SAID SCRUBBING LIQUID AGAINST SAID CURRENT OF GASEOUS WASTES AT AN INITIAL VELOCITY SUFFICIENT TO FORM DROPLETS WHICH WILL PENETRATE THE GASEOUS CURRENT AND REMOVE POLUTANTS THEREFROM, THEREBY FORMING A SLUDGE MATERIAL, AND CONTACTING THE SLUDGE MATERIAL WITH A BI-OR TRIVALENT SALT SO AS TO CAUSE SAID POLYMERIC MATERIAL TO FORM A COMPLEX STRUCTURE WHICH WILL ENTRAIN THE SOLIDS CONTENT OF THE SLUDGE BUT RELEASE A SUBSTANTIAL PORTION OF WATER THEREFROM.
Claim 2
Dependent Claim
102 words
A PROCESS FOR REMOVING POLLUTANTS FROM A CURRENT OF GASEOUS WASTES WHICH COMPRISES, PROVIDING A NON-NEWTONIAN SCRUBBING LIQUID CONTAINING WATER, AN ALKALINE HYDROXIDE OR CARBONATE, AND A COMPLEXIBLE POLYMERIC MATERIAL, SPARYING SAID SCRUBBING LIQUID AGAINST SAID CURRENT OF GASEOUS WASTES AT AN INITIAL VELOCITY SUFFICIENT TO FORM DROPLETS WHICH WILL PENETRATE THE GASEOUS CURRENT AND REMOVE POLUTANTS THEREFROM, THEREBY FORMING A SLUDGE MATERIAL, AND CONTACTING THE SLUDGE MATERIAL WITH A BI-OR TRIVALENT SALT SO AS TO CAUSE SAID POLYMERIC MATERIAL TO FORM A COMPLEX STRUCTURE WHICH WILL ENTRAIN THE SOLIDS CONTENT OF THE SLUDGE BUT RELEASE A SUBSTANTIAL PORTION OF WATER THEREFROM.
Claim 3
Dependent Claim
28 words
A process as defined in claim 1 wherein said scrubbing liquid contains polyvinyl alcohol in an amount of 2.0 percent by weight based on the liquid phase thereof.
Claim 4
Dependent Claim
27 words
A process as defined in claim 1 wherein said scrubbing liquid contains guar in an amount of 0.6 percent by weight based on the liquid phase thereof.
Claim 5
Dependent Claim
27 words
A process as defined in claim 1 where said Bi- or trivalent salt is selected from sodium sulfate or calcium chloride, alkali metal borates, and hydrates thereof.
Claim 6
Dependent Claim
71 words
A process for removing pollutants from a current of gaseous wastes which comprises, providing a non-Newtonian scrubbing liquid containing water, an alkaline hydroxide or carbonate and a polymeric additive material, spraying said scrubbing liquid against said current of gaseous wastes at an initial velocity sufficient to form droplets which will penetrate the gaseous current and remove pollutants therefrom, thereby forming a sludge material, and collecting and disposing of said sludge material.
Claim 7
Dependent Claim
71 words
A process for removing pollutants from a current of gaseous wastes which comprises, providing a non-Newtonian scrubbing liquid containing water, an alkaline hydroxide or carbonate and a polymeric additive material, spraying said scrubbing liquid against said current of gaseous wastes at an initial velocity sufficient to form droplets which will penetrate the gaseous current and remove pollutants therefrom, thereby forming a sludge material, and collecting and disposing of said sludge material.
Claim 8
Dependent Claim
13 words
A process as defined in claim 4 wherein said polymeric material is guar.
Claim 9
Dependent Claim
29 words
A process as defined in claim 5 wherein said scrubbing liquid contains guar in an amount between about 0.2 and 0.6 percent by weight of the liquid phase thereof.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |