US4092244A
Expired / Lapsed
US
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Corrosion and scale inhibitors for industrial recirculating cooling water systems
Assignee: Wyeth Holdings LLC
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Filing: 1976-08-19
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Granted: 1978-05-30
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Expires: 1996-08-19
Abstract
Abstract Disclosed is a chemical composition and a process for inhibiting corrosion and scaling on metal surfaces in industrial cooling water systems. The process includes the addition to the cooling water of from 10 to 200 ppm of an alkyl polyethoxy compound having a free carboxylate, sulfonate or phosphonate group. In some preferred embodiments, 10 to 500 ppm of a mineral oil is added to the water system, in addition to the polyethoxy compound.
Inventors
- 👤 Tzeng Jiueq Suen
- 👤 Arthur James Begala, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:27
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/124; C23F11/126; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/14; C23F11/14; C23F11/16; C23F11/162; C23F11/163; C23F11/167; C23F11/1676
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
A process for inhibiting corrosion and scaling on metal surfaces in water systems comprising: adding to water in said systems of from 10 to 200 ppm of additive selected from compounds having the general formula: R(OCH.sub.2 CH.sub.2).sub.m O(CH.sub.2).sub.x CHR'--Z' wherein: R is a hydrocarbon radical of 8 - 22 atoms; m is an integer of 1 - 6; x is 0 or 1; R' is Hydrogen or methyl; and Z' is COOM, SO 3 M or PO(OM) 2 -- where M is H or an alkali metal.
Claim 2
Dependent Claim
87 words
A process for inhibiting corrosion and scaling on metal surfaces in water systems comprising: adding to water in said systems of from 10 to 200 ppm of additive selected from compounds having the general formula: R(OCH.sub.2 CH.sub.2).sub.m O(CH.sub.2).sub.x CHR'--Z' wherein: R is a hydrocarbon radical of 8 - 22 atoms; m is an integer of 1 - 6; x is 0 or 1; R' is Hydrogen or methyl; and Z' is COOM, SO 3 M or PO(OM) 2 -- where M is H or an alkali metal.
Claim 3
Dependent Claim
23 words
The process defined by claim 1 including the addition of from 10 to 500 ppm of a selected oil dispersed in said water.
Claim 4
Dependent Claim
26 words
The process defined by claim 2 wherein said oil is a light oil petroleum fraction dispersed by means of a nonionic surfactant additive in said water.
Claim 5
Dependent Claim
18 words
The process defined by claim 1 wherein R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms.
Claim 6
Dependent Claim
14 words
The process defined by claim 4 wherein m equals an average value of 3.
Claim 7
Dependent Claim
34 words
The process defined by claim 1 wherein R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms; m equals an average of 3; x = O; R' = Hydrogen; and Z' = COOH.
Claim 8
Dependent Claim
37 words
The process defined by claim 1, wherein: R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms; m has an average value of 3; x = O, R' = H; and Z' is PO(OH) 2 .
Claim 9
Dependent Claim
93 words
An additive composition for inhibiting corrosion and scale on metal parts of a water system, said composition consisting essentially of a polyethoxy compound having the general formula: R(OCH.sub.2 CH.sub.2).sub.m O(OH.sub.2).sub.x CHR'--Z' wherein: R is a hydrocarbon radical of 8 - 22 carbon atoms; m is an integer of 1 - 6 x is 0 or 1; R' is Hydrogen or methyl; and Z' is COOM, SO 3 M or PO(OM) 2 -- where M is H or an alkali metal; and a hydrocarbon oil that is dispersible in water with said polyethoxy compound.
Claim 10
Dependent Claim
93 words
An additive composition for inhibiting corrosion and scale on metal parts of a water system, said composition consisting essentially of a polyethoxy compound having the general formula: R(OCH.sub.2 CH.sub.2).sub.m O(OH.sub.2).sub.x CHR'--Z' wherein: R is a hydrocarbon radical of 8 - 22 carbon atoms; m is an integer of 1 - 6 x is 0 or 1; R' is Hydrogen or methyl; and Z' is COOM, SO 3 M or PO(OM) 2 -- where M is H or an alkali metal; and a hydrocarbon oil that is dispersible in water with said polyethoxy compound.
Claim 11
Dependent Claim
17 words
The additive composition defined by claim 8 further comprising a non-ionic surfactant as dispersant for said oil.
Claim 12
Dependent Claim
26 words
The composition defined by claim 8 wherein R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms, and m has an average value of 3.
Claim 13
Dependent Claim
34 words
The composition defined by claim 8 wherein R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms; m = an average value of 3; x = 1; R' Hydrogen; and Z' = COOH.
Claim 14
Dependent Claim
35 words
The composition defined by claim 8 where R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms; m = an average value of 3; x = O; R' = Hydrogen; and Z' = COOH.
Claim 15
Dependent Claim
37 words
The composition defined by claim 8, wherein: R is mixed alkyl hydrocarbon of 12 and 14 carbon atoms; m has an average value of 3; x = O; R' = H; and Z' is PO(OH) 2 .
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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |