CA2042430A1 - Water treatment blend in solid form - Google Patents

Water treatment blend in solid form

Info

Publication number
CA2042430A1
CA2042430A1 CA 2042430 CA2042430A CA2042430A1 CA 2042430 A1 CA2042430 A1 CA 2042430A1 CA 2042430 CA2042430 CA 2042430 CA 2042430 A CA2042430 A CA 2042430A CA 2042430 A1 CA2042430 A1 CA 2042430A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
composition
hypochlorite
particles
solid composition
solid
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.)
Abandoned
Application number
CA 2042430
Other languages
French (fr)
Inventor
Charles G. Parsons
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.)
Eltech Systems Corp
Original Assignee
Eltech Systems Corp
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

Links

Abstract

WATER TREATMENT BLEND IN SOLID FORM
Abstract of the Disclosure There is now provided a water treatment blend in solid form for disinfection and bacteriological stabilization of aqueous media. The solid is an intimate blend of solid particulates and can provide prolonged release of both chlorine and bromine in aqueous media. The blend contains one or more alkali metal or alkaline earth metal hypochlorite with one or more N-halogenated dialkylhydantoin, The solid composition can combine excellent shelf stability with desirable disinfection property in use. A blend of calcium hypochlorite with 1-bromo-3-chloro-5, 5-dimethylhydantoin is especially preferred.

Description

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WATE;R TREATM~NT BLEND IN SOLID FOE~M

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Compositions which release chlorine into aqueous ~ media have been ~ound to be generally useful, such as ; for pr~paring a sterilizing solution~ For example it -~ has been taugh~ in U.S. Patent No. 4,134,0Z4 to sterilize an article at a temperature below that of boiling water with a sterilizing solution having active chlorine. A variety o~ ingredients havP been proposed for such a sterilizing solution. These ingredients include hypochlorite salts, toluene sulfochloroamide compounds, chlorine dioxide, chlorinated hydantoin, and trichloroisocyanuric acid and ;~ salts thereof.
Chloxine-containing compositions may also be utili~ed for treatment o~ specific media, e.g., swimming pools. In such use, compounds can be provided in a dispenser and the chemicals for water treatment thereby dispensed to the swimming pool.
Suitable chlorine donor chemicals that have been disclosed, e.gO, in British Patent NOr 1,327,763, include the chlorocyanuric acids, calcium hypochlorite and the halogenated hydantoins. It has also been known to provide a chemical dispenser of disinfecting agent ~:

for a toilet tank. As disclosed in U.S. Patent No.
4,709,423 such a dispenser for providing a disinfactant solution may contain a disinfectant such as halogenated hydantoin, trichloroisocyanuric acid, and inorganic hypochlorite salts, e.g., the salts of calcium, lithium and magnesium.
Compositions providing available chlorine may also be useful in dishwasher detergent compositions. Thus there has been disclosed in U.S. Patent No. 4,284,524 a cleaning composition for automatic dishwashers, which composition can contain available chlorine at a level of from about 0.5 to about 3 percent. To provide the available chlorine, there may be used chlorinat:ed trisodium phosphate as well as other materials such as chloroisocyanurates, chlorinated hydantoin, toluene sulfodichloroamides, hypochlorite salts, chlorinated melamine, chlorinated succinimide, or N-chloroacetyl urea and the like.
It has usually been proposed to provide various blends or mixtuxes of ingredients for thesa specific treating composition. For example U.S. Patent No.
4,709,423 recommends a mixture of trichloroisocyanuric acid plus cyanuric acid. British Patent No. 1,327,763 recommends a mixture containing cyanuric acid or salt thereo~. U~S. Patent No~ 3, 629,408 discloses a combination of hypochlorite salt with a chlorinated glycoluril.
It would however still be desirable to provide a disinfectant composition that combines a great variety of desirable charactaristics, e.g., economy of manufacture, enhanced disinfectant quality and controlled dissolve rate.

SUMMARY OF THE~ E~

There has now been devised a water treatment 3~

composition, in solid form, having much sought after disinfection characteristics for aqueous media. If desired, the composition will provide prolonged, controlled dissolve rate to such media. Moreover, the composition can exhibit viricidal properties in use, combined with extended shelf stability before use. The composition furthermore has suitable low toxicity in handlingt stoxage and use.
In one aspect, the present invention is directed to a new composition of matter comprising a solid composition in the form of particles blended together of one or more alkali metal or alkaline earth metal hypochlorite with one or more N-halogenated dialkylhydantoin. A particularly preferred blend is calcium hypochlorite with 1-bromo-3-chloro-5,5-dimethylhydantoin.
In anothex aspect the invention is directed to the method of treating an a~ueous media to provide available chlorine to such media.

2 0 DESCRIPTION OF THE PREFERRED EMBODIMI~NTS

The composition of the present inv~ntion can be used for treating a variety of fluid media. For example in water txeatment, it may be used generally to provide available chlorine to media containing biologically active components such as bacteria and viruses, e.g., it may be utilized for treating aqueous sewage rnedia, plant effluent, cooling towers, lagoons and secondary water recovery. The composition can also be used for specialty water treatment, e.g., in swimming pools. In general, the composition w.ill be utilized ~or providing available chlorine to media for bleaching, steri.lizing and disin~ecting appllcations.
The composition will provide available chlorine to the media to be treated. It is to be understood that 3~
~I
the composition might not only dispense available chlorine, but may also provide bromine. Whether the composition provides chlorine or bromine or both, for purposes of convenience, unless otherwise expressly detailed, this will be referred to hereinafter simply as available chlorine. It will thereby be understood that when the word "halogen" is used herein, such will refer to chlorine, bromine, or bo-th.
The available chlorine is expressed as the amount, as a percentage, of the halogen, i.e., chlorine or bromine or both, that is available based upon the total of such halogens present in the solid composition. This availability may be determined by titration of an aqueous solution of the composition, such as with sodium thiosulphate. This available chlorine may therefore also be referred to as titratible chlorine. Although providing a high degree of available chlorine, the composition of the present invention has a most desirable low toxicity. Yet it will nevertheless provide excellent disinfection as well as viricidal characteristics while providing for bacteriological stabilization of aqueous media.
The hypochlorite, which may also be referred to herein as the hypochlorite salt, will be an alkali metal or alkaline earth metal hypochlorite. The metal of the salt will most often be sodium, potassium, lithium, calcium or magnesium. Mixtures of these salts may also be used, such as mixtures includin~ alkali metal plus alkaline earth metal salts, e.g., lithium hypochlorite mixed with calcium hypochlorite. Preferably for economy of the composition as well as efficiency of available chlorine, the hypochlorite salt will simply be calcium hypochlorite. In the blended, solid composition the hypochlorite salt can be expected to provide from about 65 to 75 percent available chlorine, or about 55 to 75 percent available chlorine in the composition.

: ' ~

, 13~

The hydantoin used will be an N-halogenated dialkylhydantoin. The halogen for this hydantoin will be one or more of chlorine or bromine. For example, there may be used 1-bromo-3-chloro-5,5-dimethylhydantoin (which may be referred to hereina:Eter simply as "BCDMH"). Advantageously for economy, the alkyl of the dialkylhydantoin will be either or both of methyl or ethyl. For example there may be supplied as the hydantoin 1,3-dichloro-5-ethyl-5-rnethylhydantoin. The hydantoin used can be expected to provide from 4~ to 72 percent available chlorine or about 0.5 to 18 percent available chlorine in the composition as either bromine or chlorine or both. In addition to the hydantoins mentioned above, other suitable compounds that may be used include 1,3-dibromo-5,5-dimethylhydantoi.n and 1,3-dichloro-5,5-dimethylhydantoin. Additionally, mixtures of hydantoins may be utilized in the composition. For example a mixture containing a minor amount of 1,3-dichloro-5-ethyl-5-methylhydantoin may be useful where the major portion of the mixture is supplied by 1,3-dichloro-5,5 dimethylhydantoin~ It is to be understood that for economy the hydantoins that will be used will most always be the commercially available materials that can range from about 90 to more than 99 percent active ingredient, with a balance typically of incidental inerts. Preferably for efficient dispensing of available chlorine, the hydantoin used will be BCDMH.
The hypochlorite salt may be available in powder or flake form. However, other particulate, solid form, e.g., granules, can be particularly serviceable, especially where such are comminuted prior to use.
Usually, for blending with the hydantoin, the hypochlorite salt will be a free-flowing particulate having particle size within the range from about 12 to about 100 mesh. Hypochlorite salt more finely divided than about 100 mesh can lead to problems such as dusting 3~

when blending with the hydantoin. Salt particles of greater size than abou~ 12 mesh will most always detract from obtaining a uniform blend of the solid particulates. Preferably, for best blending the hypochlorite salt will be a granular material having a particle size within the range of from about 16 mesh ko about 40 mesh.
The hydantoins are usually commercially available as dry, free-flowing solids in powder or granular or flake form. Typically, as with the hypochlorite salts, the hydantoin will be in granular form and will have particle slæe from about 12 to 100 mesh. For initiating preparation of the composition, as with the hypochlorite salt, it is preferred to start with a hydantoin in granular form, e.g., to avoid dusting during blending.
- In preparing the composition, there will be used from 75 to 99 weight percent of the hypochlorite salt and from 1 to 25 weight percent of the hydantoin, basis 100 weight percent of these ingredients. UsP of less than about 75 weight percent of the hypochlorite salt will be insufficient for providing desixeable available chlorine. On the other hand, less than about 0.9 weight percent of hydantoin will be insufficient to provide beneficial effect from the hydantoin. These materials in finely divided form, e.g., as granules, can then be brought together by any mixing means, preferably by mechanical mixing means which are typically utilized for forming blends of dry ingredients. These may include, for example, stirring and tumbling means or the like.
It is advantageous that mixing be carried out in such a manner that the particle size of the ingredients being mixed is not appreciably altered during the mixing of the dry materials. A preferred dry blending operation is accomplished with a ribbon blender. Particularly where the blending is initiated with ingredients in very finely divided form, and the blending operation is to . ' ', form granules of the ingredients in mixture, the~e may be utili~ed a granulating operation, e.g., roller compacting of a moistened ingredient mix followed by granulating. By any manner of blending there will result a solid, particulate composition which will typically have a highly desirable shPlf stahility on storage, e.g., as a packaged blend of particulate solids. In use, the particles may for example be simply mixed with a liquid medium for desired treatment, or the liquid can flow by, e.g., through or over, the solid, water treatment blend particles.
It is to be understood that there may be present in the composition additional ingredients, such as binding agents, surface active agents, and the like.
For a representative composition there was blended together a commercial grade, granular calcium hypochlorite having a particle size between 16-40 mesh and containing 72-75 percent available chLorine. With this calcium hypochlorite there was blended a commercially available, 1-bromo-3-chloro-5,5-dimethylhydantoin ~BCDMH). This commercial BCDMH was 93.5 percent active ingredient, with a balance of incidental inerts, having about 59 percent available chlorine and was a granular material having particle size between 12-40 mesh. The blending was done for about 10 minutes in a double spiral blade ribbon blender. The resulting blend was a white granular solid and contained 5 weight percent BCDMH and 95 we:ight percent calcium hypochlorite, the water having been essentially volatilized during the blending operation.
This solid granular composition was 70 percent minimum active halogen, expressed as available chlorine. The pH
of a 1 percent solution of this solid, granular mixture, as determined by dissolving 1 gram of the blend in 100 milliliters of deionized water, was 9.15 at 20 C.

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Claims (15)

1. As a new composition of matter, a solid composition in the form of particles blended together of calcium hypochlorite and 1-bromo-3-chloro-5,5-dimethylhydantoin.
2. The composition of claim 1, wherein said solid composition is in the form of particles having size within the range of from about 12 to about 100 mesh.
3. The composition of claim 1, wherein said solid composition contains from 75 to 99 weight percent of said hypochlorite and from 0.9 to 25 weight percent of said hydantoin, basis 100 weight percent of these ingredients.
4. As a new composition of matter, a solid composition in the form of particles blended together of one or more alkali metal or alkaline earth metal hypochlorite with one or more N-halogenated dialkylhydantoin.
5. The composition of claim 4, wherein said solid composition is in the form of particles having size within the range of from about 12 to about 100 mesh.
6. The composition of claim 4, wherein said solid composition contains from 75 to 99 weight percent of said hypochlorite and from 0.9 to 25 weight percent of said hydantoin, basis 100 weight percent of these ingredients.
7. The composition of claim 4, wherein said hypochlorite is one or more of sodium, potassium, lithium, calcium or magnesium hypochlorite.
8. The composition of claim 4, wherein said hydantoin has N-chlorination, or N-bromination or both, and said alkyl groups are methyl, ethyl, or their mixtures.
9. The composition of claim 4, wherein said hydantoin is one or more of 1-bromo-3-chloro-5,5-dimethylhydantoin, 1, 3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin or 1,3-dichloro-5-ethyl-5-methylhydantoin.
10. The method of treating an aqueous medium to provide available chlorine thereto, which method comprises treating the medium with a solid composition of blended particles of one or more alkali metal or alkaline earth metal hypochlorite with one or more N-halogenated dialkylhydantoin.
11. The method of claim 10, wherein said solid composition of blended particles is admixed with said aqueous medium.
12. The method of claim 10, wherein said aqueous medium is flowed into contact with said solid composition of blended particles.
13. The method of claim 10, wherein said solid composition of blended particles treats an aqueous medium of one or more of sewage media, plant effluent, cooling tower liquid or secondary water media.
14. The method of claim 10, wherein said aqueous medium is treated with a solid composition of particles of one or more of lithium, calcium or magnesium hypochlorite blended with a hydantoin having N-chlorination or N-bromination, or both, and having alkyl groups of one or more of methyl or ethyl.
15. The method of claim 10, wherein said aqueous medium is treated to supply both available chlorine and bromine thereto.
CA 2042430 1990-05-29 1991-05-13 Water treatment blend in solid form Abandoned CA2042430A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US52985090 true 1990-05-29 1990-05-29
US529,850 1990-05-29

Publications (1)

Publication Number Publication Date
CA2042430A1 true true CA2042430A1 (en) 1991-11-30

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ID=24111501

Family Applications (1)

Application Number Title Priority Date Filing Date
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118587A1 (en) * 1998-09-28 2001-07-25 Ebara Corporation Method and apparatus for disinfecting drainage
US6448410B1 (en) 2000-01-18 2002-09-10 Albemarle Corporation Production of compacted biocidal agent from particulate biocidal agent without using a binder
US6495698B1 (en) 2000-01-18 2002-12-17 Albemarle Corporation Binder-free compacted forms of 1,3-dihalo-5,5-dimethylhydantoins
US6508954B1 (en) 2000-01-18 2003-01-21 Albemarle Corporation 1,3-dibromo-5,5-dimethylhydantoin of enhanced properties
US6565868B1 (en) 2000-01-18 2003-05-20 Albemarle Corporation Methods for microbiological control in aqueous systems
US6638959B2 (en) 2000-01-18 2003-10-28 Albemarle Corporation Microbiological control in aqueous systems
US6680070B1 (en) 2000-01-18 2004-01-20 Albemarle Corporation Particulate blends and compacted products formed therefrom, and the preparation thereof
US6809205B1 (en) 2000-01-18 2004-10-26 Albemarle Corporation Process for producing N-halogenated organic compounds
US6965035B1 (en) 2002-07-25 2005-11-15 Albemarle Corp Compacted forms of halogenated hydantoins
WO2006097578A1 (en) * 2005-03-16 2006-09-21 Bim Kemi Ab Method of inhibiting the growth of microorganisms
US7579018B2 (en) 2000-01-18 2009-08-25 Albemarle Corporation Microbiological control in aqueous systems
US7767240B2 (en) 2001-06-28 2010-08-03 Albemarle Corporation Microbiological control in poultry processing
US7901276B2 (en) 2003-06-24 2011-03-08 Albemarle Corporation Microbiocidal control in the processing of meat-producing four-legged animals
US7914365B2 (en) 2005-12-01 2011-03-29 Albemarle Corporation Microbiocidal control in the processing of meat-producing four-legged animals
US7999118B2 (en) 2000-01-18 2011-08-16 Albemarle Corporation Process for producing N-halogenated hydantoins

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990015780A1 (en) * 1989-06-16 1990-12-27 University Of Houston Biocidal methods and compositions for recirculating water systems
US5057612A (en) * 1990-01-22 1991-10-15 Auburn Research Foundation N,n'-dihaloimidazolidin-4-ones

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6562244B1 (en) 1998-09-28 2003-05-13 Ebara Corporation Method and apparatus for disinfecting drainage
EP1118587A4 (en) * 1998-09-28 2002-01-02 Ebara Corp Method and apparatus for disinfecting drainage
EP1118587A1 (en) * 1998-09-28 2001-07-25 Ebara Corporation Method and apparatus for disinfecting drainage
US7985413B2 (en) 2000-01-18 2011-07-26 Albemarle Corporation Microbiological control in aqueous systems
US6508954B1 (en) 2000-01-18 2003-01-21 Albemarle Corporation 1,3-dibromo-5,5-dimethylhydantoin of enhanced properties
US6495698B1 (en) 2000-01-18 2002-12-17 Albemarle Corporation Binder-free compacted forms of 1,3-dihalo-5,5-dimethylhydantoins
US6565868B1 (en) 2000-01-18 2003-05-20 Albemarle Corporation Methods for microbiological control in aqueous systems
US6638959B2 (en) 2000-01-18 2003-10-28 Albemarle Corporation Microbiological control in aqueous systems
US6641828B1 (en) 2000-01-18 2003-11-04 Albemarle Corporation Methods for microbiological control in aqueous systems
US6680070B1 (en) 2000-01-18 2004-01-20 Albemarle Corporation Particulate blends and compacted products formed therefrom, and the preparation thereof
US6448410B1 (en) 2000-01-18 2002-09-10 Albemarle Corporation Production of compacted biocidal agent from particulate biocidal agent without using a binder
US8586763B2 (en) 2000-01-18 2013-11-19 Albemarle Corporation Process for producing N-halogenated hydantoins
US7999118B2 (en) 2000-01-18 2011-08-16 Albemarle Corporation Process for producing N-halogenated hydantoins
US7579018B2 (en) 2000-01-18 2009-08-25 Albemarle Corporation Microbiological control in aqueous systems
US6809205B1 (en) 2000-01-18 2004-10-26 Albemarle Corporation Process for producing N-halogenated organic compounds
US9029562B2 (en) 2000-01-18 2015-05-12 Albemarle Corporation Process for producing N-halogenated hydantoins
US7767240B2 (en) 2001-06-28 2010-08-03 Albemarle Corporation Microbiological control in poultry processing
US6965035B1 (en) 2002-07-25 2005-11-15 Albemarle Corp Compacted forms of halogenated hydantoins
US7901276B2 (en) 2003-06-24 2011-03-08 Albemarle Corporation Microbiocidal control in the processing of meat-producing four-legged animals
WO2006097578A1 (en) * 2005-03-16 2006-09-21 Bim Kemi Ab Method of inhibiting the growth of microorganisms
US7914365B2 (en) 2005-12-01 2011-03-29 Albemarle Corporation Microbiocidal control in the processing of meat-producing four-legged animals

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