EP0008819A1 - Geschirrspülverfahren - Google Patents
Geschirrspülverfahren Download PDFInfo
- Publication number
- EP0008819A1 EP0008819A1 EP19790200419 EP79200419A EP0008819A1 EP 0008819 A1 EP0008819 A1 EP 0008819A1 EP 19790200419 EP19790200419 EP 19790200419 EP 79200419 A EP79200419 A EP 79200419A EP 0008819 A1 EP0008819 A1 EP 0008819A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- anion
- exchange resin
- exchange
- dishwashing machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4229—Water softening arrangements
Definitions
- the invention relates to a method for improving the dishwashinq machine operation.
- the present invention is not concerned with the basic mechanics of such washing machines, but proposes to improve the dishwashing machine operation in that it allows the use of detergents with a lower content of alkaline ingredients.
- the operation of a dishwashing machine is based on the combination cf three distinct actions, viz,
- Current detergent powders or liquids for use in dishwashing machines are generally highly alkaline products comprising essentially nonionic surfactant, sodium triphosphate, sodium metasilicate and chlorine bleach.
- All dishwashing machines are provided with a water-softening device, operating on the principle of removing the water-hardnes: cations, viz Ca 2+ and Mg 2+ ions, from tap water by ion-exchange, using a cation-exchange resin which is capable of exchanging Ca 2+ and Mg 2+ ions.
- a water-softening device operating on the principle of removing the water-hardnes: cations, viz Ca 2+ and Mg 2+ ions, from tap water by ion-exchange, using a cation-exchange resin which is capable of exchanging Ca 2+ and Mg 2+ ions.
- Such a device generally comprises a column containing a cation-exchange resin, through which the intake water is passed before entering the machine.
- Many natural waters also contain bicarbonate anions (HCO 3 -) which form the so-called temporary hardness of the water. These ions are not removed by the water-softening device containing a cation-exchange
- the invention now provides a method for improving the dishwashing machine operation in that it enables the use of detergent products of lower alkaline content, comprising the removal of both the water-hardness cations as well as the bicarbonate anions from the intake water entering the machine during the washing programme.
- the dishwashing machine is operated with an additional ion-exchange device in the intake water line comprising a column containing an anion-exchange resin for removing said bicarbonate anions from the water in conjunction with a water-softening device.
- This device can be installed either as a separate device connected in series with the water-softening device either before or after it, or in parallel therewith, or it can form an integral part of combined water-softening and decarbonating system.
- the ion-exchange resin column contains a mixture of cation-exchange resin and anion-exchange resin.
- the water entering the dishwashing machine will be substantially free from Ca2+, Mg2+ and HC0 3 - ions.
- anion-exchange resins which can be used in the present invention are known in the art and various types are commercially available, ranging from the very basic types to the slightly acid types. "Lewatit" anion-exchange resins, supplied by the Bayer Company, Leverkusen, Germany, are typical examples of readily available commercial products.
- Preferred anion-exchange resins are those which can be regenerated with a solution of NaCl, as such resins will be regeneratable with the same regeneration salt as that used for regenerating the water-softening resin. Regeneration may then take place simultaneously for both water-softening resin and the anion-exchange resin without any special measures.
- An example of such resin is the commercial product "Lewatit M 600", supplied by the Bayer Company.
- FIG. 1 An example of a combined ion-exchange device according to the invention for installing in a dishwashing machine is shown schematically in the attached Figure 1.
- the figure shows a column (1) containing a mixture cf anion- and cation-exchange resins and a containerr (2) for the regenerating salt.
- water is taken, in via line (3) and passes through the ion-exchange column, where it is softened ano decarbonated at the same time before entering the machine at point (4).
- all or part of the water stream can be passed through the regenerating salt versol (2) via line (5) .
- a column containing the anion-exchange resin "Lewatit M 600" was installed in the water intake line of a Flandria dishwashing machine type R 12 before the water-softening device.
- Fig. 2 is a graph showing the evolution of HC0 3 - concentration in a dishwashing machine with and without an anion-exchanger column, containing "Lewatit M 600", which was regenerated after each cycle with NaCl.
- the upper curve shows HC0 3 - concentration in the machine without an anion-exchange device.
- the lower curve shows HC0 3 - concentration in the machine provided with an anion-exchange device.
- the machine was operated according to a programme including the regeneration of the resins, using the following detergent products.
Landscapes
- Detergent Compositions (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7832016 | 1978-08-02 | ||
GB3201678 | 1978-08-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0008819A1 true EP0008819A1 (de) | 1980-03-19 |
EP0008819B1 EP0008819B1 (de) | 1983-05-11 |
Family
ID=10498818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19790200419 Expired EP0008819B1 (de) | 1978-08-02 | 1979-07-27 | Geschirrspülverfahren |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0008819B1 (de) |
DE (1) | DE2965369D1 (de) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB831687A (en) * | 1955-05-12 | 1960-03-30 | Gen Electric | Improvements in dishwashing apparatus |
DE1963087A1 (de) * | 1968-12-16 | 1970-07-23 | Crane Co | Verfahren zum Entmineralisieren von Wasser |
GB1233488A (de) * | 1968-10-18 | 1971-05-26 | ||
DE1628560A1 (de) * | 1967-01-18 | 1971-10-28 | Candy Spa | Vorrichtung zum Entkalken von Wasser in Wasch- und Spuelmaschinen,insbesondere Geschirrspuelmaschinen |
DE2312126A1 (de) * | 1973-03-10 | 1974-09-12 | Bosch Siemens Hausgeraete | Geschirrspuelmaschine mit einem spuelbehaelter und einem ionenaustauscher zum enthaerten von frischwasser |
DE1585797B2 (de) * | 1966-10-06 | 1976-03-04 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Verfahren zum betrieb eines waschautomaten mit einer wasserenthaertungsanlage und waschmaschine zur durchfuehrung des verfahrens |
-
1979
- 1979-07-27 EP EP19790200419 patent/EP0008819B1/de not_active Expired
- 1979-07-27 DE DE7979200419T patent/DE2965369D1/de not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB831687A (en) * | 1955-05-12 | 1960-03-30 | Gen Electric | Improvements in dishwashing apparatus |
DE1585797B2 (de) * | 1966-10-06 | 1976-03-04 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Verfahren zum betrieb eines waschautomaten mit einer wasserenthaertungsanlage und waschmaschine zur durchfuehrung des verfahrens |
DE1628560A1 (de) * | 1967-01-18 | 1971-10-28 | Candy Spa | Vorrichtung zum Entkalken von Wasser in Wasch- und Spuelmaschinen,insbesondere Geschirrspuelmaschinen |
GB1233488A (de) * | 1968-10-18 | 1971-05-26 | ||
DE1963087A1 (de) * | 1968-12-16 | 1970-07-23 | Crane Co | Verfahren zum Entmineralisieren von Wasser |
DE2312126A1 (de) * | 1973-03-10 | 1974-09-12 | Bosch Siemens Hausgeraete | Geschirrspuelmaschine mit einem spuelbehaelter und einem ionenaustauscher zum enthaerten von frischwasser |
Also Published As
Publication number | Publication date |
---|---|
DE2965369D1 (en) | 1983-06-16 |
EP0008819B1 (de) | 1983-05-11 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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17P | Request for examination filed | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: UNILEVER PLC Owner name: UNILEVER NV |
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ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
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