EP0008819B1 - Geschirrspülverfahren - Google Patents

Geschirrspülverfahren Download PDF

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Publication number
EP0008819B1
EP0008819B1 EP19790200419 EP79200419A EP0008819B1 EP 0008819 B1 EP0008819 B1 EP 0008819B1 EP 19790200419 EP19790200419 EP 19790200419 EP 79200419 A EP79200419 A EP 79200419A EP 0008819 B1 EP0008819 B1 EP 0008819B1
Authority
EP
European Patent Office
Prior art keywords
water
anion
exchange resin
dishwashing machine
exchange
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.)
Expired
Application number
EP19790200419
Other languages
English (en)
French (fr)
Other versions
EP0008819A1 (de
Inventor
Tan Tai Ho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10498818&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0008819(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP0008819A1 publication Critical patent/EP0008819A1/de
Application granted granted Critical
Publication of EP0008819B1 publication Critical patent/EP0008819B1/de
Expired legal-status Critical Current

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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 dishwashing 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 of 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-hardness cations, viz Ca2+ and Mg 2+ ions, from tap water by ion-exchange, using a cation-exchange resin which is capable of exchanging Ca2+ and Mg 2+ ions.
  • a water-softening device operating on the principle of removing the water-hardness cations, viz Ca2+ and Mg 2+ ions, from tap water by ion-exchange, using a cation-exchange resin which is capable of exchanging Ca2+ 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 (HC03 which form the so-called temporary hardness of the water. These ions are not removed by the water-softening device containing a cation-exchange resin.
  • 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 by passing the intake water through a cation exchange resin and an anion exchange resin, characterised in that both ion exchange resins are regenerated with sodium chloride.
  • 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 a 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+, Mg 2+ 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.
  • anion-exchange resins are those which can be regenerated with a solution of NaCI, such resins will be regeneratable with the same regeneration salt as that normally 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 of anion- and cation-exchange resins and a container (2) for the regenerating salt.
  • water is taken in via line (3) and passes through the ion-exchange column, where it is softened and 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 vessel (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 R12 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 NaCI.
  • 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)

Claims (1)

  1. Verfahren zur Verbesserung der Wirkung einer Geschirrspülmaschine, wobei sowohl Wasserhärtekationen als auch Bicarbonatanionen aus dem Einlasswasser, das während des Waschprogramms in die Maschine hineinkommt, entfernt werden, indem das Einlasswasser über ein Kationenaustauschharz und ein Anionenaustauschharz geführt wird, dadurch gekennzeichnet, dass beide lonenaustauschharze mit Natriumchlorid regeneriert werden.
EP19790200419 1978-08-02 1979-07-27 Geschirrspülverfahren Expired EP0008819B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3201678 1978-08-02
GB7832016 1978-08-02

Publications (2)

Publication Number Publication Date
EP0008819A1 EP0008819A1 (de) 1980-03-19
EP0008819B1 true 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)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL102991C (de) * 1955-05-12
DE1628560A1 (de) * 1967-01-18 1971-10-28 Candy Spa Vorrichtung zum Entkalken von Wasser in Wasch- und Spuelmaschinen,insbesondere Geschirrspuelmaschinen
US3492159A (en) * 1968-10-18 1970-01-27 Economics Lab Water conditioning
FR2026297A1 (en) * 1968-12-16 1970-09-18 Crane Co Water demineralisation using an excharge - resins
DE2312126C2 (de) * 1973-03-10 1983-02-24 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Geschirrspülmaschine mit einem Spülbehälter und einem Ionenaustauscher zum Enthärten von Frischwasser

Also Published As

Publication number Publication date
EP0008819A1 (de) 1980-03-19
DE2965369D1 (en) 1983-06-16

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