• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a suspension for metering into an aqueous system, in particular in swimming pool water, wherein the suspension contains calcium hypochlorite suspended in the water and at least one dispersing agent for dispersing the solid calcium hypochlorite particles in the suspension and the dispersing agent is selected from the group of polyphosphates, phosphonates and / or polycarboxylates. Furthermore, a method for metering the aqueous suspension into an aqueous system, for example swimming pool water, using a metering device is disclosed.
    公开号:CH708689B1
    申请号:CH01156/14
    申请日:2014-07-28
    公开日:2018-03-15
    发明作者:Farkhar Human
    申请人:Witty Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Description: The present invention relates to an aqueous suspension for metering in an aqueous system, in particular in swimming pool water, and a method for metering the suspension.
    Calcium hypochlorite is used for the production of aqueous suspensions, which are metered in as a water treatment solution for disinfection in swimming pool water. When producing and dosing a calcium hypochlorite suspension in aqueous systems, e.g. Swimming pool water, metering interruptions occur again and again, as undissolved, poorly soluble calcium compounds such as calcium carbonate ("lime"), calcium sulfate ("gypsum") or calcium hydroxide are deposited in the alkaline suspension and also form. As described in DE 10 2006 045 109 A1, these deposits can be loosened with hydrochloric acid, which on the one hand is environmentally harmful and on the other hand can be hazardous to health for the operating personnel. The preparation and metering can also be carried out by means of a metering device according to DE 20 2012 003 713 U1, with which the initially undissolved and solid constituents of calcium hypochlorite in the suspension can be largely dissolved or removed from the suspension without the addition of an acid. However, these substances still clog metering pumps, metering lines, hoses and metering valves of the metering device over time.
    The object of the present invention is therefore to provide an aqueous suspension for metering in an aqueous system, in particular in swimming pool water, the calcium hypochlorite and any insoluble accompanying solids, if any, being better dispersed or suspended or at least partly in dissolved form available. A longer, maintenance-free operating time of the metering device, with which the suspension is metered into an aqueous system, is also to be ensured.
    The object is achieved with a suspension for metering into an aqueous system with the features of claim 1, a method for metering an aqueous suspension into an aqueous system according to claim 5, and the use of a complexing agent selected from the group of polyphosphates , Phosphonates and / or polycarboxylates, as dispersants for dispersing solid calcium hypochlorite particles in an aqueous calcium hypochlorite suspension.
    By adding the complexing agent to the calcium hypochlorite suspension, the suspended calcium hypochlorite particles and optionally present water-insoluble accompanying compound particles are dispersed or at least partially dissolved, i.e. the complexing agent acts as a dispersing agent. Preferred embodiments of the suspension according to the invention and of the method according to the invention are shown in the dependent claims.
    In the suspension according to the invention, the addition of the complexing agent in the calcium hypochlorite suspension serves to disperse or at least partially dissolve the solid calcium hypochlorite particles and the water-insoluble accompanying substances in the suspension. The added complexing agent acts as a dispersing agent and thereby enables the production of a completely dispersed and / or essentially completely dissolved calcium hypochlorite suspension and brings about a better dosage of the calcium hypochlorite suspension in the aqueous system.
    The presence of solid particles and accompanying substances in a calcium hypochlorite suspension for the disinfection of swimming pool water and similar germ-inhibiting bodies of water harbors the prolonged use of a metering device with which the suspension is metered into the aqueous system, the risk of deposition and finally clogging of parts the device by the solid, undissolved or undispersed or suspended particles. Calcium compounds in particular are deposited at certain points in the metering device which are favorable for separation and can disrupt the transport of the suspension and, in extreme cases, bring them to a standstill. In order to disperse or dissolve these sparingly soluble calcium compounds in the suspension so that the aqueous suspension can then be metered in without disruption or interruption, an additive in the form of a complexing agent is added to the calcium hypochlorite suspension according to the invention. The complexing agent acts as a dispersing agent and leads to the dispersion of the (water-insoluble) solid particles, in particular the calcium-containing solids such as e.g. Calcium carbonate and calcium hydroxide in the aqueous suspension, thereby ensuring trouble-free dosing of the suspension in an aqueous system. An additional advantage is that companion compound particles are not only kept in suspension, but surprisingly partially completely dissolved.
    The dispersants used according to the invention are non-acidic (alkaline or neutral), water-soluble complexing agents from the product classes of the polyphosphates, phosphonates and / or polycarboxylates. A mixture of polyphosphates and polycarboxylates is preferred. Surprisingly, the dispersants containing polycarboxylates are chlorine-stable (up to 8% calcium hypochlorite) products.
    Generally, these dispersants are added as an aqueous solution in an amount of 800 to 2400 ppm, preferably in an amount of 1600 to 1800 ppm, the water for the preparation of the calcium hypochlorite suspension so that the concentration of the dispersant, based on the suspended calcium hypochlorite Concentration is 1% to 24% and preferably the concentration is in the range of 2 to 16%. Although this does not achieve complete complexation of the insoluble constituents, the calcium hypochlorite suspensions can be metered without problems even with these sub-stoichiometric additions. The dispersants can be used alone, e.g. in the
    CH 708 689 B1 quantity ranges mentioned below, as well as in combination with each other, with any mixing ratio, selected from the aforementioned product groups. In a preferred embodiment, the dispersant added to the suspension as an additive contains 28-50, preferably 33-45, particularly preferably 38-40% by weight of polyphosphate; 2-8, preferably 3-7, particularly preferably 4-6% by weight of polycarboxylates; and 0.4-1.6, preferably 0.6-1.4, particularly preferably 0.8-1.2% by weight of sodium hydroxide or potassium hydroxide and the balance water. Instead of or in addition to polyphosphate, a phosphonate can also be used.
    As the polycarboxylate products of the Sokalan series, in particular the product Sokalan PA 30 CL, have proven to be suitable. Sokalan PA 30 CL is a solution of polyacrylate and this has an average molar mass of approx. 8000 g / mol (measured by the GPC method). The viscosity of the approx. 45% solution is approx. 1300 mPas (measured with the Brookfield viscometer).
    Potassium tripolyphosphate is provided as a solution, in particular as a 50% solution. The pH value is 11. Other alkali polyphosphates can also be used in addition to potassium tripolyphosphate or instead.
    Phosphonates are salts of organic phosphonic acids. The organic residue can e.g. be an alkyl radical or an aryl radical. Several phosphonate residues can be present in one molecule. Similar to the polyamino acids, aminopolyphosphonic acids can also be produced by bridging. The phosphonates can be used as complexing agents and builders. Examples of phosphonates are HEDP, ATMP, NTMP, DTPMP, EDTMP or PBTC. Phosphonates are generally bacterially degradable.
    The dispersants are expediently added in proportion to the quantity, preferably in the preparation of the calcium hypochlorite suspension. The calcium hypochlorite suspension can be produced in the device described below in accordance with DE 20 2012 003 713 U1 and metered into an aqueous system. In this metering device with a suspending device and a metering device, at least part of the calcium hypochlorite suspension is branched off from a feed line, via which the suspension is passed from the suspending device into the metering device, into a return line and is returned through the return line to the suspending device. This return of part of the calcium hypochlorite suspension to the suspending device thus takes place in the cycle mode. Suitable circulation times for the circulatory operation are in the range from 1 to 100 seconds and particularly preferably between 5 seconds and 45 seconds. By returning part of the suspension to the suspending device, which is expediently carried out by pumping around permanently with a pump, the undissolved and solid calcium hypochlorite particles are mechanically broken up and can then be dissolved in the suspension. The mechanical size reduction is supported by the use of a centrifugal pump, which comprises paddle wheels. By pumping the suspension around, the suspension is further set in turbulence, which promotes the dispersion of the calcium hypochlorite particles. As an alternative or in addition to pumping around, turbulence of the suspension can also be generated by an agitator.
    An improved chemical dispersion or even solution of the solid particles takes place after adding the dispersing agent (complexing agent) into the suspension device. The paddle wheels of the centrifugal pump also crush the still solid calcium hypochlorite particles of the suspension, which is pumped around with the centrifugal pump. The calcium hypochlorite particles comminuted by pumping around the suspension, which have not dissolved in the suspension, can be metered into the aqueous system in the comminuted form without any problems by the metering device or are complexed by the dispersant added to the suspension as an additive such that a there is a substantially higher amount of well-dispersed calcium hypochlorite and / or the respective accompanying substances, so that a deposition of solids in the system is largely avoided. This considerably extends the maintenance intervals for the dosing device and protects the parts of the device. The calcium hypochlorite suspension is thus at least essentially completely dispersed and / or completely dissolved, the term “essentially” describing at least twice the service life as without an additive.
    [0015] The invention is described in more detail below with reference to an exemplary embodiment in which a calcium hypochlorite solution is complexed:
    Test Description:
    In one experiment, equivalent amounts of the following additive are added as a dispersing agent to an 8% calcium hypochlorite suspension for the required complete calcium complexation.
    While stirring with a magnetic stirrer, 131 ml of the additive was added as a dispersant to 90 ml of 8% calcium hypochlorite suspension, for example. When the additive is added a little at a time, voluminous white flakes are formed, which dissolve on further addition and pass into an almost clear solution. The mixture thickens briefly, but liquefies again when it is added. The end result is slightly opaque, slightly yellowish solutions.
    A preferred additive (dispersant) for completely dispersing the calcium hypochlorite and the water-insoluble accompanying substances in a calcium hypochlorite suspension is composed as follows:
    CH 708 689 B1
    No. raw material % By weight in the formulation of the additive 1 tap water 9.4 2 Complexing agents from the group of polycarboxylates (50%) 10.0 3 Sodium hydroxide solution (50%) 2.0 4 Potassium tripolyphosphate solution (50%) 78.6100
    This preferred composition as a dispersant is added as an additive in aqueous solution to the water of a calcium hypochlorite suspension in an amount of 800 to 2400 ppm and preferably in an amount of 1600 to 1800 ppm, so that the concentration of the dispersant is based on the suspended calcium hypochlorite concentration is 1% to 24% and is preferably in the range of 2 to 16%. The suspensions thus formed can be metered into an aqueous system with the known metering devices, even with these sub-stoichiometric additions of the additive added as a dispersing agent, without disturbing the metering process, in particular clogging in the metering device.
    权利要求:
    Claims (9)
    [1]
    claims
    1. Suspension for dosing in an aqueous system, in particular in swimming pool water, the suspension containing calcium hypochloride suspended in water and at least one dispersant for dispersing the solid calcium hypochlorite particles in the suspension and the dispersant being selected from the group of polyphosphates, phosphonates and / or polycarboxylates.
    [2]
    2. Suspension according to claim 1, wherein the dispersant contains potassium tripolyphosphate and polycarboxylates and optionally alkali metal hydroxide.
    [3]
    3. Suspension according to claim 2, wherein the dispersant contains 28-50 wt .-% potassium tripolyphosphate, 2-8 wt .-% polycarboxylates, 0.4-1.6 wt .-% sodium hydroxide and the balance water.
    [4]
    4. Suspension according to claim 1, wherein the suspension further contains accompanying substances with water-insoluble constituents, the water-insoluble constituents of the accompanying substances being dispersed in the dispersion by the dispersing agent.
    [5]
    5. A method for metering an aqueous suspension into an aqueous system using a metering device which comprises a suspending device in which powdered, granular or tablet-shaped calcium hypochlorite is suspended in a calcium hypochlorite suspension by adding water, and a metering device with which the calcium hypochlorite suspension is passed into the aqueous system, the calcium hypochlorite suspension being sucked out of the suspension device with a mammal pump and fed via a feed line to the metering device, characterized in that the calcium hypochlorite suspension in the suspension device is a dispersant selected from the group of Polyphosphates, phosphonates and / or polycarboxylates is added.
    [6]
    6. The method according to claim 4, characterized in that the water in the suspending device is kept in a turbulent flow when adding the powdered, granular or tablet-shaped calcium hypochlorite.
    [7]
    7. The method according to claim 5, characterized in that the calcium hypochlorite suspension in the suspension device is set in a turbulence, the turbulence being generated by an agitator or by pumping around the calcium hypochlorite suspension.
    [8]
    8. The method according to any one of claims 5 to 7, characterized in that the dispersant is added in proportion to the quantity when suspending the calcium hypochlorite in the suspending device.
    [9]
    9. Use of a complexing agent, selected from the group of polyphosphates, phosphonates and / or polycarboxylates, as a dispersing agent for dispersing solid calcium hypochlorite particles in an aqueous calcium hypochlorite suspension.
    类似技术:
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    DE971180C|1958-12-18|Process for cleaning water
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    DE3590278T1|1986-10-09|Control of the viscosity of slurries
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    DE1037420B|1958-08-28|Klaeren von Trueben
    DE119263C|
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    AT167108B|1950-11-10|Process for the production of viscose in one operation.
    DE60214687T2|2007-09-13|Process for burning a dispersion of heavy oil residues in water
    同族专利:
    公开号 | 公开日
    CH708689A2|2015-04-15|
    AT514910B1|2020-10-15|
    DE102013111150B4|2018-05-03|
    AT514910A2|2015-04-15|
    AT514910A3|2020-09-15|
    DE102013111150A1|2015-04-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4087360A|1975-09-24|1978-05-02|Olin Corporation|Method of inhibiting scale formation|
    DK0429631T3|1989-06-16|1993-08-30|Univ Houston|Biocidal Methods and Compositions for Recycling Water Systems|
    AU1613199A|1997-12-08|1999-06-28|Ppg Industries Ohio, Inc.|Calcium hypochlorite composition|
    US6776926B2|2001-08-09|2004-08-17|United States Filter Corporation|Calcium hypochlorite of reduced reactivity|
    FR2830169A1|2001-09-28|2003-04-04|Dominique Mercier|Bactericidal composition useful for treating drinking water and disinfecting water mains comprises sodium or calcium hypochlorite and a phosphate|
    US6932909B2|2002-01-15|2005-08-23|Kroff Chemical Company, Inc.|Method of treating mine drainage|
    DE102006045109A1|2006-09-21|2008-04-03|Witty Chemie Gmbh & Co. Kg|Device for dosing of calcium hypochlorite into aqueous system, comprises mechanism for suspending powder-, or granulate- or tablet shaped calcium hypochlorite into a calcium hypochlorite-suspension by addition of water, and a dosing device|
    US7625496B2|2006-11-03|2009-12-01|Chemtura Corporation|Solid composition for treating water|
    JP2013094766A|2011-11-04|2013-05-20|Kurita Water Ind Ltd|Ship ballast water treating agent and method for treating ship ballast water using the same|
    DE202012003713U1|2012-04-13|2013-07-15|Witty Chemie Gmbh & Co. Kg|Device for dosing calcium hypochlorite in an aqueous system|
    法律状态:
    2022-02-28| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013111150.5A|DE102013111150B4|2013-10-09|2013-10-09|Use of a complexing agent in an aqueous suspension, in particular for dosing in swimming pool water, and method for dosing an aqueous suspension into an aqueous system|
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