US3607781A
Expired / Lapsed
US
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Corrosion inhibitor for hydrochloric acid pickling of steel
Assignee: Wyandotte Chemicals Corp
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Filing: 1968-01-15
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Granted: 1971-09-21
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Expires: 1988-01-15
Abstract
Abstract A corrosion inhibitor composition for addition to aqueous solutions normally corrosive to metal surfaces is prepared by dissolving a surface active agent and an amine in a mixture of mineral acids.
Inventors
- 👤 Thomas M Kaneko
- 👤 Irving R Schmolka
- 👤 John W Compton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
A composition as defined in claim 1 wherein the nonionic surface active agent is a polyoxyethylenE-polyoxypropylene block polymer.
Claim 2
Dependent Claim
20 words
A composition as defined in claim 1 wherein the nonionic surface active agent is a blend of polyoxyethylene-polyoxypropylene block copolymers.
Claim 3
Dependent Claim
15 words
A composition as defined in claim 1 wherein the hydroxy (lower alkyl) amine is monoethanolamine.
Claim 4
Dependent Claim
81 words
A low-foaming corrosion inhibitor composition according to claim 1 consisting essentially of from about 25 to 32 percent by weight of a nonionic surface active agent consisting essentially of a blend of polyoxyethylene-polyoxypropylene block copolymers; from about 5 to 14 percent by weight of a hydroxy (lower alkyl) amine; from about 20 to 30 percent by weight of phosphoric acid; from about 7 to 13 percent by weight of hydrochloric acid; from about 11 to 43 percent by weight of water.
Claim 5
Dependent Claim
90 words
The composition of claim 5 wherein the blend of polyoxyethylene-polyoxypropylene block copolymers consists essentially of from about five to 20 parts by weight of a first block copolymer having a molecular weight of from about 7,800 to 9,800 with ethylene oxide groups representing from about 75 to 85 percent by weight of the first copolymer to one part of a second block copolymer having a molecular weight of from about 1,500 to 2,500 with ethylene oxide groups representing from about 10 to 20 percent by weight of the second polymer.
Claim 6
Dependent Claim
72 words
A process for the preparation of a corrosion inhibitor composition which comprises: a. forming an acid solution by adding, with mixing, an aqueous solution of phosphoric acid to an aqueous solution of hydrochloric acid; b. adding incrementally to said acid solution a nonionic surface active agent selected from the group consisting of a polyoxyethylene-polyoxypropylene block copolymer and a blend of polyoxyethylene-polyoxypropylene block copolymers, the nonionic surface active agent corresponding to the formula:
Claim 7
Dependent Claim
16 words
The process of claim 7 wherein the nonionic surface active agent is a polyoxyethylene-polyoxypropylene block copolymer.
Claim 8
Dependent Claim
18 words
The process of claim 7 wherein the nonionic surface active agent is a blend of polyoxyethylene-polyoxypropylene block copolymers.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein the hydroxy (lower alkyl) amine is monoethanolamine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |