US4532047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica inhibition: prevention of silica deposition by addition of low molecular weight organic compounds
Assignee: ChampionX LLC
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Filing: 1984-06-29
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Granted: 1985-07-30
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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 which comprises treating said waters with an effective amount for the purpose of inhibiting amorphous silica scale formation of a water-soluble, low molecular weight polypolar organic compound containing hydroxyl, primary amino and/or secondary amino functional groups, and mixtures thereof, or with a combination of this polypolar organic compound with a boron compound which forms or is hydrolyzed to form orthoborate ions when dissolved in the industrial waters.
Inventors
- 👤 Leonard Dubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:08
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters having a ph of at least 5.0 which comprises treating said waters with an effective amount for the purpose of inhibiting amorphous silica scale formation of at least one water soluble polypolar organic compound containing hydroxyl and/or primary amino functional groups, wherein the polypolar organic compound has a molecular weight not exceeding about 500, and is selected from the group consisting of glycerine, 1,5-hexamethylenediamine, Bis-hexamethylene triamine, ethylene glycol, triethylenetetraamine, ethylene diamine, diethanolamine, monoethanolamine, N-ethylamine monoethanolamine.
Claim 2
Independent Claim
90 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters having a ph of at least 5.0 which comprises treating said waters with an effective amount for the purpose of inhibiting amorphous silica scale formation of at least one water soluble polypolar organic compound containing hydroxyl and/or primary amino functional groups, wherein the polypolar organic compound has a molecular weight not exceeding about 500, and is selected from the group consisting of glycerine, 1,5-hexamethylenediamine, Bis-hexamethylene triamine, ethylene glycol, triethylenetetraamine, ethylene diamine, diethanolamine, monoethanolamine, N-ethylamine monoethanolamine.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the polypolar organic compound has a molecular weight not exceeding about 200.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the polypolar organic compound is a polyhydroxy compound having a molecular weight not exceeding about 200.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the polypolar compound is a polyamino compound having a molecular weight not exceeding about 200, and containing only primary amino functional groups.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the polypolar compound is an alkanolamine having a molecular weight not exceeding about 200.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein the water soluble polypolar organic compound is chosen from the group consisting of ethylene glycol, glycerine, monoethanolamine, and ethylene diamine.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the effective amount of polypolar organic compound is at least 10 ppm.
Claim 9
Independent Claim
95 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters having a ph of at least 5.0 which comprises treating said waters with an effective amount of an admixture of a water-soluble polypolar organic compound containing hydroxyl, primary amino, or secondary amino functional groups, and mixtures thereof, having a molecular weight not exceeding about 500, with a boron compound which forms orthoborate ion when dissolved in or hydrolyzed by said waters, and wherein the polypolar organic compound and orthoborate ion are in a weight ratio of about 10:1 to 1:10.
Claim 10
Independent Claim
95 words
A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters having a ph of at least 5.0 which comprises treating said waters with an effective amount of an admixture of a water-soluble polypolar organic compound containing hydroxyl, primary amino, or secondary amino functional groups, and mixtures thereof, having a molecular weight not exceeding about 500, with a boron compound which forms orthoborate ion when dissolved in or hydrolyzed by said waters, and wherein the polypolar organic compound and orthoborate ion are in a weight ratio of about 10:1 to 1:10.
Claim 11
Dependent Claim
72 words
The method of claim 8 wherein the polypolar organic compound is chosen from the group consisting of ethylene glycol, glycerine, mannitol, sorbitol, tris(hydroxymethyl)methane, tris(hydroxymethyl)methanol, monoethanolamine, diethanolamine, N-ethylaminomonoethanolamine, N,N, diethanolamine, N,N,N,N-tetrakis(hydroxylethyl)ethylenediamine, ethylene diamine, triethylenetetramine, 1,6 hexamethylenediamine, Bis-hexamethylenetriamine, tetraethylenepentamine, and mixtures thereof, and the boron compound is chosen from the group consisting of boric acid and its water-soluble salts, boron trihalides, fluoboric acid and its water-soluble salts, boron trifluoride-ethyl amine complex, and mixtures thereof.
Claim 12
Dependent Claim
15 words
The method of claim 1 or 8 wherein the industrial waters are alkaline cooling waters.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |