US4566912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regenerating alkali-containing wash solutions utilized for cleaning containers
Assignee: Seitz Enzinger Noll Maschinenbau AG
•
Filing: 1984-05-11
•
Granted: 1986-01-28
•
Expires: 2004-05-11
Abstract
Abstract Separation of dissolved aluminum, copper, and other heavy metals and/or carbonates from sodium hydroxide or potassium hydroxide containing wash solutions utilized during the mechanical cleaning of metal-clad containers, especially bottles. This separation is accomplished by adding calcium compounds and separating off the thereby formed precipitates from the wash solution. The specific calcium compound is added to the wash solution directly in the form of a solid compound. Calcium oxide or calcium hydroxide are preferably used as the calcium compounds, and are primarily added directly to the wash solution as a solid.
Inventors
- 👤 Siegbert Borg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:59
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/06; B; B08; B08B; B08B3/00; B08B3/04; B08B3/10; B08B3/14; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A method of regenerating wash solution for permanently maintaining wash force thereof and which contains sodium hydroxide and/or potassium hydroxide, and which is used during the mechanical cleaning of containers such as bottles; the wash solution contains, as impurities, dissolved aluminum, copper, or other heavy metals in the form of zinc, iron, nickel, or lead, which originated from the containers, and carbonates resulting during the cleaning, and organic substances which adhere to the containers; said method comprising the steps of: adding directly to said impure wash solution at least one calcium compound in the form of one of the group consisting of solid calcium compounds and aqueous suspensions thereof, to thus form at least one precipitate to remove said impurities although maintaining wash force by having free alkali available therein; and separating said precipitate from said wash solution especially removing salts therefrom to produce regenerated wash solution.
Claim 2
Independent Claim
147 words
A method of regenerating wash solution for permanently maintaining wash force thereof and which contains sodium hydroxide and/or potassium hydroxide, and which is used during the mechanical cleaning of containers such as bottles; the wash solution contains, as impurities, dissolved aluminum, copper, or other heavy metals in the form of zinc, iron, nickel, or lead, which originated from the containers, and carbonates resulting during the cleaning, and organic substances which adhere to the containers; said method comprising the steps of: adding directly to said impure wash solution at least one calcium compound in the form of one of the group consisting of solid calcium compounds and aqueous suspensions thereof, to thus form at least one precipitate to remove said impurities although maintaining wash force by having free alkali available therein; and separating said precipitate from said wash solution especially removing salts therefrom to produce regenerated wash solution.
Claim 3
Dependent Claim
22 words
A method according to claim 1, in which said at least one calcium compound which is added is a solid calcium compound.
Claim 4
Dependent Claim
16 words
A method according to claim 1, in which said calcium compound is an inorganic calcium compound.
Claim 5
Dependent Claim
14 words
A method according to claim 3, in which said calcium compound is calcium oxide.
Claim 6
Dependent Claim
14 words
A method according to claim 3, in which said calcium compound is calcium hydroxide.
Claim 7
Dependent Claim
23 words
A method according to claim 3, in which said calcium compound is selected from the group consisting of calcium chloride and calcium sulfate.
Claim 8
Dependent Claim
16 words
A method according to claim 1, in which said calcium compound is an organic calcium compound.
Claim 9
Dependent Claim
14 words
A method according to claim 7, in which said calcium compound is calcium acetate.
References Cited (Backward Citations)
US3816306A
Cited
US4124504A
Cited
US4390431A
Cited
US4350597A
Cited
US4434060A
Cited
US4465598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |