US4584104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica inhibition: prevention of silica deposition by boric acid/orthorborate ion
Assignee: Ecolab USA Inc
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Filing: 1984-06-29
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Granted: 1986-04-22
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Expires: 2004-06-29
Abstract
Abstract A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates is disclosed. The method involves treating the industrial waters with a boron compound which dissolves in or hydrolyzes in these industrial waters to give the orthoborate ion. The preferred boron compound is boric acid, its salts, or precursors.
Inventors
- 👤 Leonard Dubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:26
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/086; C02F5/083
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates which comprises, at a pH of at least 5.0, treating said waters with an effective amount for the purpose of inhibiting amorphous silica scale, of a boron compound which forms orthoborate ion when dissolved in or hydrolyzed by said waters.
Claim 2
Independent Claim
58 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates which comprises, at a pH of at least 5.0, treating said waters with an effective amount for the purpose of inhibiting amorphous silica scale, of a boron compound which forms orthoborate ion when dissolved in or hydrolyzed by said waters.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the industrial waters are recirculating cooling waters.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the industrial waters contain at least 5.0 ppm silica as SiO 2 .
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the industrial waters are treated with at least 5.0 ppm boric acid.
Claim 6
Dependent Claim
29 words
The method of claim 1 in which the industrial waters have a pH exceeding 5.0 and are treated with boric acid at a concentration of at least 50 ppm.
Claim 7
Independent Claim
58 words
A method of inhibiting amorphous silica scale formation on metal surfaces in contact with alkaline industrial cooling waters having a pH of at least 5.0 which comprises treating said cooling waters with at least 5.0 ppm boric acid and its water-soluble salts, to produce an effective amount of orthoborate ion for the purpose of inhibiting amorphous silica scale.
Claim 8
Independent Claim
58 words
A method of inhibiting amorphous silica scale formation on metal surfaces in contact with alkaline industrial cooling waters having a pH of at least 5.0 which comprises treating said cooling waters with at least 5.0 ppm boric acid and its water-soluble salts, to produce an effective amount of orthoborate ion for the purpose of inhibiting amorphous silica scale.
Claim 9
Independent Claim
67 words
A method of inhibiting amorphous silica scale formation on metal surfaces in contact with recirculating alkaline industrial cooling waters having a pH of at least 7.0 which comprises treating said cooling waters with at least 25.0 ppm of a boron compound which dissolves in or hydrolyzes in said water to give an effective amount of orthoborate ion for the purpose of inhibiting said amorphous silica scale formation.
Claim 10
Independent Claim
67 words
A method of inhibiting amorphous silica scale formation on metal surfaces in contact with recirculating alkaline industrial cooling waters having a pH of at least 7.0 which comprises treating said cooling waters with at least 25.0 ppm of a boron compound which dissolves in or hydrolyzes in said water to give an effective amount of orthoborate ion for the purpose of inhibiting said amorphous silica scale formation.
Claim 11
Independent Claim
85 words
A method of inhibiting amorphous silica scale formation in cooling waters containing industrial corrosion treatment chemicals selected from the group consisting of water-soluble chromium salts, water-soluble zinc salts, water-soluble phosphonates, water-soluble orthophosphates, water-soluble polyphosphates and combinations thereof which comprises treating the cooling waters at a pH of at least 5.0 with at least 25.0 ppm of a boron compound which dissolves in or hydrolyzes in said water to give an effective amount of orthoborate ion for the purpose of inhibiting said amorphous silica scale formation.
Claim 12
Independent Claim
85 words
A method of inhibiting amorphous silica scale formation in cooling waters containing industrial corrosion treatment chemicals selected from the group consisting of water-soluble chromium salts, water-soluble zinc salts, water-soluble phosphonates, water-soluble orthophosphates, water-soluble polyphosphates and combinations thereof which comprises treating the cooling waters at a pH of at least 5.0 with at least 25.0 ppm of a boron compound which dissolves in or hydrolyzes in said water to give an effective amount of orthoborate ion for the purpose of inhibiting said amorphous silica scale formation.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |