Patent US4609488A successfully refreshed from Google Patents.
US4609488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of aqueous degreasing and cleaning solutions
Assignee: Henkel AG and Co KGaA
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Filing: 1983-12-15
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Granted: 1986-09-02
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Expires: 2003-12-15
Abstract
Abstract A process for regenerating and recycling aqueous alkaline or neutral degreasing and cleaning solutions contaminated with emulsified oils by adding thereto cationic surfactants or cationically modified polymers or a combination of cationic surfactants and cationically modified polymers to break the emulsions. The contaminants which precipitate are mechanically separated off and the cleaning solution is thereby regenerated without loss of cleaning efficacy.
Inventors
- 👤 Jurgen Geke
- 👤 Bernd Stedry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:55
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/547; C11; C11D; C11D1/00; C23; C23G; C23G1/00; C23G1/36; C11D2111/00; C11D2111/40; C11D2111/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A process for regenerating aqueous alkaline or neutral degreasing and cleaning solutions contaminated with an emulsified oil containing an anionic emulsifier comprising adding thereto an effective quantity of a cationic demulsifier which is a nitrogen-containing cationically modified polymer wherein the cationic modification is by either protonation or alkylation, and wherein the polymer consists essentially of polyethylene imine or a methylated polymer of ethylene imine.
Claim 2
Dependent Claim
64 words
A process for regenerating aqueous alkaline or neutral degreasing and cleaning solutions contaminated with an emulsified oil containing an anionic emulsifier comprising adding thereto an effective quantity of a cationic demulsifier which is a nitrogen-containing cationically modified polymer wherein the cationic modification is by either protonation or alkylation, and wherein the polymer consists essentially of polyethylene imine or a methylated polymer of ethylene imine.
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1 wherein the cationically modified polymer has a molecular weight of from about 5×10 4 to about 5×10 7 .
Claim 4
Dependent Claim
21 words
A process in accordance with claim 1 wherein the molecular weight is from about 7.5×10 4 to about 5×10 6 .
Claim 5
Dependent Claim
23 words
A process in accordance with claim 1 wherein an effective quantity of a defoaming agent is also added to the contaminated cleaning solution.
Claim 6
Dependent Claim
25 words
A process in accordance with claim 1 wherein the process is carried out at a temperature of from about room temperature to about 80° C.
Claim 7
Dependent Claim
30 words
A process in accordance with claim 1 wherein from about 0.5 to about 2 equivalents of cationic demulsifier is added per equivalent of anionic emulsifier present in the contaminated solution.
Claim 8
Dependent Claim
21 words
A process in accordance with claim 1 wherein about 1 equivalent of cationic demulsifier is added per equivalent of anionic demulsifier.
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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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |