US4284513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preventing encrustations on surfaces which are in constant contact with aqueous solutions containing matter prone to crystallize
Assignee: Saarberg-Hoelter Umwelttechnik GmbH
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Filing: 1979-07-20
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Granted: 1981-08-18
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Expires: 1999-07-20
Abstract
Abstract The present invention is a process for preventing incrustations of surfaces which are in contact with aqueous solutions containing material prone to crystallize by forming a thin, protective film on the surface to be protected.
Inventors
- 👤 Gerhardt Scholl
- 👤 Friedrich Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; C; C23; C23F; C23F15/00; C23F15/005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
Method for preventing the deposit of precipitated crystalline materials on the surface of measuring equipment receivers for equipment in power plant gas desulfurizing installations, whose measuring cell is flowed through by a material tending to crystallize out containing aqueous liquid for measuring the physical or chemical properties of this liquid, characterized by the fact that the liquid flowing to the measuring receiver has a chemical substance conducted into it which forms a thin protective film on the surface to be protected, and further characterized by feeding solution from a container to an electrode in the measuring cell and pumping the chemical substance by a proportioning pump into the liquid immediately before it flows into the measuring cell, and flowing liquid and the chemical substance in the measuring cell through small openings in a glass tube surrounding a second electrode in the measuring cell, said glass tube constituting a surface upon which the thin film is formed.
Claim 2
Dependent Claim
156 words
Method for preventing the deposit of precipitated crystalline materials on the surface of measuring equipment receivers for equipment in power plant gas desulfurizing installations, whose measuring cell is flowed through by a material tending to crystallize out containing aqueous liquid for measuring the physical or chemical properties of this liquid, characterized by the fact that the liquid flowing to the measuring receiver has a chemical substance conducted into it which forms a thin protective film on the surface to be protected, and further characterized by feeding solution from a container to an electrode in the measuring cell and pumping the chemical substance by a proportioning pump into the liquid immediately before it flows into the measuring cell, and flowing liquid and the chemical substance in the measuring cell through small openings in a glass tube surrounding a second electrode in the measuring cell, said glass tube constituting a surface upon which the thin film is formed.
Claim 3
Dependent Claim
65 words
Method according to claim 1, characterized by pumping aqueous solution with dissolved chemical substance from a container into the aqueous liquid before it flows into the measuring cell, the dissolved chemical substance spreading in the aqueous liquid and a portion of that substance forming a thin protective film on the glass tube with small openings, preventing the small openings from being clogged by precipitated crystals.
Claim 4
Dependent Claim
57 words
Method according to claim 1 characterized by the fact that a dissolved chemical substance is upstreamly added to the aqueous liquid before that aqueous liquid reaches the measuring cell in the measuring equipment receivers, that dissolved chemical substance forming a thin film on the surface to be protected, especially on the surface of the measuring equipment receiver.
Claim 5
Dependent Claim
16 words
Method according to claim 3, characterized by the fact that organophosphates are provided as chemical substance.
Claim 6
Dependent Claim
21 words
Method according to claim 4, characterized by the fact that esters and other derivatives of phosphoric acid are used as organophosphates.
Claim 7
Dependent Claim
15 words
Method according to claim 4, characterized by the fact that phosphonates are used as organophosphates.
Claim 8
Dependent Claim
17 words
Method according to claim 4, characterized by the fact that polyol-phosphoric acid esters are used as organophosphates.
Claim 9
Dependent Claim
19 words
Method according to claim 3, characterized by the fact that compounds of polyacrylic amides are provided as chemical substance.
Claim 10
Dependent Claim
32 words
Method according to claim 3, characterized by the fact that the concentration of the chemical substance distributed in the aqueous liquid lies between about 5 and 50 g per m 3 .
Claim 11
Dependent Claim
19 words
Method according to claim 3, characterized by the fact that the added organic substance is chemically neutral (pH 7.0).
Claim 12
Dependent Claim
35 words
Method according to claim 3, characterized by the fact that the chemical substance is pumped into the aqueous liquid flowing to the measuring receivers by a proportioning pump before the liquid enters the measuring cell.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |