US4409119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for regenerating cleaning solutions
Assignee: Henkel AG and Co KGaA
•
Filing: 1982-04-23
•
Granted: 1983-10-11
•
Expires: 2002-04-23
Abstract
Abstract Process for regenerating alkaline and neutral phosphate and/or silicate-containing degreasing and cleaning solutions which are contaminated with emulsified mineral and/or natural oils, by treating such contaminated solutions with a controlled quantity of either calcium ions, magnesium ions, or a mixture thereof.
Inventors
- 👤 Helga Burger
- 👤 Christian Rossmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C23; C23G; C23G1/00; C23G1/36; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A process for regenerating an alkaline or neutral aqueous degreasing and cleaning solution containing at least 1 g/l of a phosphate or a silicate, or a mixture thereof, and wherein said solution is contaminated with emulsified mineral oil, natural oil, or a mixture thereof, comprising adding to said contaminated solution either (1) from about 0.3 to about 2 g/l of calcium ions, (2) from about 0.2 to about 1.2 g/l of magnesium ions, or (3) a mixture of calcium ions and magnesium ions chemically equivalent to from about 0.3 to about 2 g/l of calcium ions.
Claim 2
Dependent Claim
96 words
A process for regenerating an alkaline or neutral aqueous degreasing and cleaning solution containing at least 1 g/l of a phosphate or a silicate, or a mixture thereof, and wherein said solution is contaminated with emulsified mineral oil, natural oil, or a mixture thereof, comprising adding to said contaminated solution either (1) from about 0.3 to about 2 g/l of calcium ions, (2) from about 0.2 to about 1.2 g/l of magnesium ions, or (3) a mixture of calcium ions and magnesium ions chemically equivalent to from about 0.3 to about 2 g/l of calcium ions.
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1 wherein the concentration range of calcium ions in (1) and (3) is from about 0.6 to about 1.2 g/l.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein the concentration range of magnesium ions in (2) is from about 0.35 to about 0.7 g/l.
Claim 5
Dependent Claim
50 words
A process in accordance with claim 1, 2 or 3 wherein the source of calcium ions is calcium nitrate, calcium chloride, or a mixture thereof, and the source of magnesium ions is magnesium nitrate, magnesium sulfate, magnesium chloride, or a mixture of two or more of the foregoing magnesium compounds.
Claim 6
Dependent Claim
77 words
A process in accordance with claim 1, 2 or 3 in which said solution contains at least one alkali metal silicate and is free of phosphate and wherein from about 4 to about 8 g/l of either (i) a soluble salt of aluminum, (ii) a soluble salt of ferric iron, or (iii) a mixture of a soluble salt of aluminum and a soluble salt of ferric iron, is also added to the contaminated degreasing and cleaning solution.
Claim 7
Dependent Claim
20 words
A process in accordance with claim 1, 2 or 3 wherein a polyelectrolyte-based flocculating agent is added to the solution.
Claim 8
Dependent Claim
30 words
A process in accordance with claim 1, 2 or 3 wherein the contaminated degreasing and cleaning solution also contains from about 0.1 to about 5 g/l of a nonionic surfactant.
Claim 9
Dependent Claim
26 words
A process in accordance with claim 1, 2 or 3 wherein the resulting oily layer and precipitate are removed from the regenerated degreasing and cleaning solution.
References Cited (Backward Citations)
US2980608A
Cited
DE2150958A1
Cited
US3983033A
Cited
US4229295A
Cited
SU662504A1
Cited
US4267058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |