CA1306654C - Low-foaming compositions - Google Patents
Low-foaming compositionsInfo
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- CA1306654C CA1306654C CA000522229A CA522229A CA1306654C CA 1306654 C CA1306654 C CA 1306654C CA 000522229 A CA000522229 A CA 000522229A CA 522229 A CA522229 A CA 522229A CA 1306654 C CA1306654 C CA 1306654C
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- surface active
- active agent
- water
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Abstract
ABSTRACT
Detergent and detergent-sanitiser compositions suitable for high pressure, clean-in-place and closed circuit cleaning procedures for use in the dairy and in soft drink and other food processing equipment. The detergent sanitiser compositions of the invention are useful in the treatment of bulk volumes of water such as public water supplies, swimming pools, holding tanks and the like. The present invention provides a low-foaming composition comprising: a first non-ionic surface active agent having a cloud point of less than 40°C in a 1% aqueous solution; and a hydrotrope and/or a co-solvent for said surface active agent.
Detergent and detergent-sanitiser compositions suitable for high pressure, clean-in-place and closed circuit cleaning procedures for use in the dairy and in soft drink and other food processing equipment. The detergent sanitiser compositions of the invention are useful in the treatment of bulk volumes of water such as public water supplies, swimming pools, holding tanks and the like. The present invention provides a low-foaming composition comprising: a first non-ionic surface active agent having a cloud point of less than 40°C in a 1% aqueous solution; and a hydrotrope and/or a co-solvent for said surface active agent.
Description
13~G65i4 ~.., ~, D~SCRIPTION
LOW-POAMING COMPOS TIONS
TECHNICAL FIELD
The present invention relates to dete~gent and det~rgent-sanitiser compositions suitable for high plessure, clea~-~n-place and closed circuit cleaning procedures for use in the dairy and in soft drink and other food proce sing equipment.
The detergent sanitiser compo~itions of the invention are u~eful i~ the treatment of bulk volumes o~ water such a~
public water fiupplies, swimming pools, holding tanks and the like.
.U~til the present inYention it has been difficult to provide uitable detergent and detergent-sanitiser compositions with the desired low foam characte~istics for . uch purposes.
BACKCROUND ART
.
Although many propositions have been made for low foami~g detergent ~omposi~ions which usually were a combination of a nonionic surface active agent with a Eoam depressant, there is still a need for such low foaming dete~gent compositîons, especially when the detergent ~olutions are used at elevated temperatures. Some cleaning and cleaning-sanitising operations can be carried out satisfactorily with cold water at ambient tempera~ures, it is often pre~erred to work at higher operating tempe~atures.
Thus, while some detergent compositions based on nonionic surfac~a~ts are of~en preheated to operating temperature~ a:~ove-350 C, they will generate only li~tle foam i~ the upper rahge o~ their temperature, but on cooli~g down, which takes place rapidly during the cleaning operation, the foam generation will gradually increase eve~ i~ the presence of defoaming agents.- ~
The availability of detergent compositions o~ low foam characte~i~tics a~ ambie~t temperature~ is of greates~
importa~ce fo~ 6pecial purpose detergent-sani~iser compositlons incorporating iodine as it8 complex wit~ a : nonionic surfactant, known a~ an iodophor.
It is generally recogni~ed that iodine has di~ti~ct '~'' ' ` ~
.
- 13~665~
advantages ove~ chlorine ~or water traatment, which today iz either used by it6elf or in the fo~m of chlorine generating ~ubstances, a~ the most widely used water disinfectant.
Not only i~ iodine considerably more effective aqainst mofit pathogenic organisms, and therefore can be used at lower ~oncentrations than chlorine, but iodine does not impart disagreeable odour or ta~te to the water. This makes it emi~ently suitable for ~otable water and for u~e in swimmi~g pool~. Added advantages of using iodine in the treatment of swimming pool water are that it eliminates the inconvenience of regular pH control, and that unlike chlorine a~d bromine ie does no~ reace wi~h ammonia, amines or like compounds such as u~ea to form compounds responsible for irritation of the eyes and mucous membranes, associated with chlorinated swimming pool water. Furthermore, the level of iodine concentration in the water is less liable to reductio~ by pollution.
The importance of iodine for the treatment o~ municipal water and swimming pools has been recognised by the American Public Health Association, which has set a minimum of 0.2 ppm of iodi~e for disinfection.
The efficiency o~ iodine in water disinfection, especially in emergency conditions, is illustrated by the ~act that highly contaminated water with a baceerial count o~
LOW-POAMING COMPOS TIONS
TECHNICAL FIELD
The present invention relates to dete~gent and det~rgent-sanitiser compositions suitable for high plessure, clea~-~n-place and closed circuit cleaning procedures for use in the dairy and in soft drink and other food proce sing equipment.
The detergent sanitiser compo~itions of the invention are u~eful i~ the treatment of bulk volumes o~ water such a~
public water fiupplies, swimming pools, holding tanks and the like.
.U~til the present inYention it has been difficult to provide uitable detergent and detergent-sanitiser compositions with the desired low foam characte~istics for . uch purposes.
BACKCROUND ART
.
Although many propositions have been made for low foami~g detergent ~omposi~ions which usually were a combination of a nonionic surface active agent with a Eoam depressant, there is still a need for such low foaming dete~gent compositîons, especially when the detergent ~olutions are used at elevated temperatures. Some cleaning and cleaning-sanitising operations can be carried out satisfactorily with cold water at ambient tempera~ures, it is often pre~erred to work at higher operating tempe~atures.
Thus, while some detergent compositions based on nonionic surfac~a~ts are of~en preheated to operating temperature~ a:~ove-350 C, they will generate only li~tle foam i~ the upper rahge o~ their temperature, but on cooli~g down, which takes place rapidly during the cleaning operation, the foam generation will gradually increase eve~ i~ the presence of defoaming agents.- ~
The availability of detergent compositions o~ low foam characte~i~tics a~ ambie~t temperature~ is of greates~
importa~ce fo~ 6pecial purpose detergent-sani~iser compositlons incorporating iodine as it8 complex wit~ a : nonionic surfactant, known a~ an iodophor.
It is generally recogni~ed that iodine has di~ti~ct '~'' ' ` ~
.
- 13~665~
advantages ove~ chlorine ~or water traatment, which today iz either used by it6elf or in the fo~m of chlorine generating ~ubstances, a~ the most widely used water disinfectant.
Not only i~ iodine considerably more effective aqainst mofit pathogenic organisms, and therefore can be used at lower ~oncentrations than chlorine, but iodine does not impart disagreeable odour or ta~te to the water. This makes it emi~ently suitable for ~otable water and for u~e in swimmi~g pool~. Added advantages of using iodine in the treatment of swimming pool water are that it eliminates the inconvenience of regular pH control, and that unlike chlorine a~d bromine ie does no~ reace wi~h ammonia, amines or like compounds such as u~ea to form compounds responsible for irritation of the eyes and mucous membranes, associated with chlorinated swimming pool water. Furthermore, the level of iodine concentration in the water is less liable to reductio~ by pollution.
The importance of iodine for the treatment o~ municipal water and swimming pools has been recognised by the American Public Health Association, which has set a minimum of 0.2 ppm of iodi~e for disinfection.
The efficiency o~ iodine in water disinfection, especially in emergency conditions, is illustrated by the ~act that highly contaminated water with a baceerial count o~
2~ 10 organisms per ml is reduced ~ithin 10 minute~ at 25C
to drinking water quality o~ 10 organisms per 100 ml by the addition o~ 3.0 to 4.0 ppm iodine.
As idoph^ors~were known to have inherant foaming properties and were thus un~uitable for water treatment, many proposals have been made to provide suitable water treatment methods using iodine, other than as an iodophor as the disin~ecting a~ent. I~ chlorine has so~far maintained its predomina~ poRition in the treatment o~ water fo~ domestic, public and industri~l waters, it is only due to the ~echni~al difficulties a~d high co~ts which ha~e prevented up to date the gene~al use of iodine based wate~ disinfectants.
DESCRIPTION OF THE INVENTION
The present invention relates to detergent and detefgent-saniti2i~g compositio~s`anæ to water treaement :,--13~66~
compositions which maintain low-foaming characteristics over a wide range of operating temperatures at which cleaning and cleaning-sanitising operations and water treating processes are performed.
The low-foaming detergent and detergent-sanitising compositions of the invention are suitable for use at ambient temperatures and for treatment bulk volumes of water.
Low foaming detergent compositions of the invention which may incorporate an iodophor, are suitable for pressure clean-in-place and clos d circuit cleaning at ambient temperatures, encountered under normal climati~ conditions.
The present invention provides a low-foaming composition comprising not less than 1% hy weight of a first non-ionic surface active agent having a cloud point of less than 40 C in a 1% aqueous solution; and not less than 0.25% by weight of a hydrotrope and optionally a co-solvent for said surface active agent. The hydrotrope is an alkylated benzene or a naphthalene sulfonate water soluble salt of an inorganic or organic base or urea.
It is advantageous b~t not essentially required to add an additional nonionic surface active agent having a lower ~` hydrophilic-lipophilic balance. Usually, the second surface active agent will be employed in a lesser amount than the first surface active agent.
Either surface active agent may contain up to 30% by weight of iodine in the form of an iodophor. Usually, the first surfac~
active agent will contain the iodine.
30~ It was surprisingly found that low foaming nonionic surface active agents having a cloud point in a 1.0% aqueous solution of below 40 C when solubilised by a hydrotrope or a co-solvent or ~ a mixture of both retain their low-foaming characteristics over `~ a wide range o~ temperatures when preheated solutions are then cooled and can also be used at ambient cold water temperatures.
It has further been found that the solubilising effect of `~ the hydrotrope is not restricted to nonionic surface active ; agents, but also to complexes formed between nonionic surface ' ~3 ",. ., " ~,. " .;, .. .
~3~P665~
- 3a -active agents and iodine without any loss of antibacterial activity. Such complexes are known as iodophors.
5In some cases the hydrotropes will cause the formation of stable dispersions at operating temperatures. However, /
: /
/
/
` ~ /
.
,,~ . .... .
13~66~
these dispe~sions retain their ~leansing properties, and whe~e Phey incor~o~ate iodine, also their disinfecting prope~t.ies .
There are many ways known and duly described as to how S the complex formation of the iodine with the surface active agent is achie~ed. ~owever, the simplest and mos~ practical way is by dissolving the iodine directly in an excess o~ t~e surface active agent or mixing iodine with the sur~ace active agent sepa~ately to an available iodine content up to about 30% by weight based on the combined weight. For use for water treatment an available iodine content of about 5% to about lS~ is preferred.
-If the iodophor is not directly ma~e with the nonionic surface active agent used in the composition, it is added.
In the case of a detergent-sanitizer which con~ains an - iodophor, i~ is p~eferred that an acid, such as phospho~ic acid, hydrochloric acid, sulfuric acid, sulfamie acid, pre~erably phosphoric acid or sulfamic acid or a mixture thereo~, is added to give the use dilution a pH below about 5 pre~erabl~ between about 1.5 and about 5, and more preferably between about 3 and about 5.
The amount o~ iodopho~ is calculated so that the final detergent sanitizing composition has an available iodine content between about 0.2 and 3.0%. For water treatment com~ositions can contain up to 30% w/~ available iodine~
The compositions of the invention also ~ind use in treatme~t of bulk Yolumes of water. Accordingly, the invention alsd-pro~ides a method fox water disinfection which comprises adding an effective amount of a composition o~ the inven~ion which containc iodine to the water to be treated so as to achieve an iodine content o~ from about O.lppm to about lOppm.
Conve~tional iodopho~ are not suitable as t~eir use would result in unacceptable foaming in use in municipal wa~er treatment, swi~ming pools, air conditio~i~g cooling ~ater and the like.
For the treatment of hiqhly ~ontaminated watcr for drinking purposes, an iodine level o~ a~out 4.Oppm to a~out 8.Qppm ~ight be neces6a~y, whereas about 0.2ppm to about ., , .~ ~.. , ,, -~3~
., .. ~ ~
V.4ppm i~ usually suf~icient to keep the water in ~wimming pools at a ~atisfactory quality.
The preferred surface active agents are tho~e derived from alkyl--or dialkyl-phenols having 5 to 7 ethoxy groups-per molecule oc the ethylene oxide copolymers with propylene oxide. The surface active agent ean be used alone or in combination with other suitable nonionic surface active agents having similar cloud point characteristics.
Other suitable nonionic surface active agents are those selected from copolymers of ethylene oxide with propylene -~ oxide or the ethylene oxide condensates with al~yl or dialkylphenols, fatty acid alcohols or acids.
Suitable hydrotropes are, for example, the water - soluble salts of toluene sulfonates,xylene sul~onates,cumene sul~onates or naphthalene sulfonates, preferably cumene sulfonates.
Suitable as co-solvenes are lower alcohols such as me-thanol, ethanol, propanol or isopropanol, or propylene glycol or a polyethylene glycol. Propylene qly501 iS the co-solvent of preerence.
The amount of hydrotrope or co-solvent to be added is established by stirring the nonionic sur~ace active agents with the iodopho~, if present, in approximately three qua~ters of the final volume of water, at the lowest temperature at which the detergent composition is expec~ed to operate, and adding sufficient hydrotrope or co-solvent until a clear solution or stable suspension is obtained.
MQDES~FOR CARRYING OUT THE INVENTION
The ~ollowin~ examples illustrate preferred embodiments of the~present inven~ion. They should not be construed as binding to the claims hereto. Unles otherwise indicated, the in~r~die~ts are combined by standard cold mixing processes.
EX~X~P 1~_~
an~ lace cleanin~
~ parts by weight ~onyl phenol ethoxylate(6 mol ethoxy) 70.0 ~odium xylene sulfonate ~0~ solution 40.0 sodium metasilicate 50.0 ~odium tripolyphosphate 30.0 water~ to make lOOO.OmL
... .
to drinking water quality o~ 10 organisms per 100 ml by the addition o~ 3.0 to 4.0 ppm iodine.
As idoph^ors~were known to have inherant foaming properties and were thus un~uitable for water treatment, many proposals have been made to provide suitable water treatment methods using iodine, other than as an iodophor as the disin~ecting a~ent. I~ chlorine has so~far maintained its predomina~ poRition in the treatment o~ water fo~ domestic, public and industri~l waters, it is only due to the ~echni~al difficulties a~d high co~ts which ha~e prevented up to date the gene~al use of iodine based wate~ disinfectants.
DESCRIPTION OF THE INVENTION
The present invention relates to detergent and detefgent-saniti2i~g compositio~s`anæ to water treaement :,--13~66~
compositions which maintain low-foaming characteristics over a wide range of operating temperatures at which cleaning and cleaning-sanitising operations and water treating processes are performed.
The low-foaming detergent and detergent-sanitising compositions of the invention are suitable for use at ambient temperatures and for treatment bulk volumes of water.
Low foaming detergent compositions of the invention which may incorporate an iodophor, are suitable for pressure clean-in-place and clos d circuit cleaning at ambient temperatures, encountered under normal climati~ conditions.
The present invention provides a low-foaming composition comprising not less than 1% hy weight of a first non-ionic surface active agent having a cloud point of less than 40 C in a 1% aqueous solution; and not less than 0.25% by weight of a hydrotrope and optionally a co-solvent for said surface active agent. The hydrotrope is an alkylated benzene or a naphthalene sulfonate water soluble salt of an inorganic or organic base or urea.
It is advantageous b~t not essentially required to add an additional nonionic surface active agent having a lower ~` hydrophilic-lipophilic balance. Usually, the second surface active agent will be employed in a lesser amount than the first surface active agent.
Either surface active agent may contain up to 30% by weight of iodine in the form of an iodophor. Usually, the first surfac~
active agent will contain the iodine.
30~ It was surprisingly found that low foaming nonionic surface active agents having a cloud point in a 1.0% aqueous solution of below 40 C when solubilised by a hydrotrope or a co-solvent or ~ a mixture of both retain their low-foaming characteristics over `~ a wide range o~ temperatures when preheated solutions are then cooled and can also be used at ambient cold water temperatures.
It has further been found that the solubilising effect of `~ the hydrotrope is not restricted to nonionic surface active ; agents, but also to complexes formed between nonionic surface ' ~3 ",. ., " ~,. " .;, .. .
~3~P665~
- 3a -active agents and iodine without any loss of antibacterial activity. Such complexes are known as iodophors.
5In some cases the hydrotropes will cause the formation of stable dispersions at operating temperatures. However, /
: /
/
/
` ~ /
.
,,~ . .... .
13~66~
these dispe~sions retain their ~leansing properties, and whe~e Phey incor~o~ate iodine, also their disinfecting prope~t.ies .
There are many ways known and duly described as to how S the complex formation of the iodine with the surface active agent is achie~ed. ~owever, the simplest and mos~ practical way is by dissolving the iodine directly in an excess o~ t~e surface active agent or mixing iodine with the sur~ace active agent sepa~ately to an available iodine content up to about 30% by weight based on the combined weight. For use for water treatment an available iodine content of about 5% to about lS~ is preferred.
-If the iodophor is not directly ma~e with the nonionic surface active agent used in the composition, it is added.
In the case of a detergent-sanitizer which con~ains an - iodophor, i~ is p~eferred that an acid, such as phospho~ic acid, hydrochloric acid, sulfuric acid, sulfamie acid, pre~erably phosphoric acid or sulfamic acid or a mixture thereo~, is added to give the use dilution a pH below about 5 pre~erabl~ between about 1.5 and about 5, and more preferably between about 3 and about 5.
The amount o~ iodopho~ is calculated so that the final detergent sanitizing composition has an available iodine content between about 0.2 and 3.0%. For water treatment com~ositions can contain up to 30% w/~ available iodine~
The compositions of the invention also ~ind use in treatme~t of bulk Yolumes of water. Accordingly, the invention alsd-pro~ides a method fox water disinfection which comprises adding an effective amount of a composition o~ the inven~ion which containc iodine to the water to be treated so as to achieve an iodine content o~ from about O.lppm to about lOppm.
Conve~tional iodopho~ are not suitable as t~eir use would result in unacceptable foaming in use in municipal wa~er treatment, swi~ming pools, air conditio~i~g cooling ~ater and the like.
For the treatment of hiqhly ~ontaminated watcr for drinking purposes, an iodine level o~ a~out 4.Oppm to a~out 8.Qppm ~ight be neces6a~y, whereas about 0.2ppm to about ., , .~ ~.. , ,, -~3~
., .. ~ ~
V.4ppm i~ usually suf~icient to keep the water in ~wimming pools at a ~atisfactory quality.
The preferred surface active agents are tho~e derived from alkyl--or dialkyl-phenols having 5 to 7 ethoxy groups-per molecule oc the ethylene oxide copolymers with propylene oxide. The surface active agent ean be used alone or in combination with other suitable nonionic surface active agents having similar cloud point characteristics.
Other suitable nonionic surface active agents are those selected from copolymers of ethylene oxide with propylene -~ oxide or the ethylene oxide condensates with al~yl or dialkylphenols, fatty acid alcohols or acids.
Suitable hydrotropes are, for example, the water - soluble salts of toluene sulfonates,xylene sul~onates,cumene sul~onates or naphthalene sulfonates, preferably cumene sulfonates.
Suitable as co-solvenes are lower alcohols such as me-thanol, ethanol, propanol or isopropanol, or propylene glycol or a polyethylene glycol. Propylene qly501 iS the co-solvent of preerence.
The amount of hydrotrope or co-solvent to be added is established by stirring the nonionic sur~ace active agents with the iodopho~, if present, in approximately three qua~ters of the final volume of water, at the lowest temperature at which the detergent composition is expec~ed to operate, and adding sufficient hydrotrope or co-solvent until a clear solution or stable suspension is obtained.
MQDES~FOR CARRYING OUT THE INVENTION
The ~ollowin~ examples illustrate preferred embodiments of the~present inven~ion. They should not be construed as binding to the claims hereto. Unles otherwise indicated, the in~r~die~ts are combined by standard cold mixing processes.
EX~X~P 1~_~
an~ lace cleanin~
~ parts by weight ~onyl phenol ethoxylate(6 mol ethoxy) 70.0 ~odium xylene sulfonate ~0~ solution 40.0 sodium metasilicate 50.0 ~odium tripolyphosphate 30.0 water~ to make lOOO.OmL
... .
3~66~
E~AMPLE 2 Low _oamina deter~ent for clQsed circuit cleanina o~ sofe and.similar fillina equiPment.
parts by weight S couolymer of ethylene oxide with propylene oxide~ ~o,o sodium salt of cumene sulfonate 40~ 150.0 tetrapotassium polyphosphate 100.0 disodium ethylene diaminetetraacetate 20.0 water to make lOOO.OmL
(Teric PE 61, available from I.C.I. LTD. UK
o~ Plurionic L 61 from Wyandotte Chemical Corp. USA.) :
Deteraent - sanitizer ~or the dair~ industrY
parts by weight nonyl phenol ethoxylate(7 mol ethoxy) 21.0 nonyl phenol ethoxylate(5 mol ethoxy~ 1.5 iodine 1.9 ~; 20 sodium cumene sulfonate 35.0 phosphoric acid 95~ 160.0 " water, ~o make lOOO.OmL
~`
The iodine was dissolved by stirring it in the excess of the nonyl phenol ethoxylate(7 mol ethoxy), to complex the iodine. at a tempe~ature between 45 to 60C until all iodine has gone into solution whereupon the rest of the nonyl phenol ethoxylate was added. The resulting mixture was cooled to ambient~ tempeLatU~e and added wi~h light agitation to the : mixture of t~e sodium cumene sulfonate, phosphoric acid and water until a homoqeneous solution was ob~ained.
~:~: The detergent sanitizer concent~ate thus obtained has .
;~ an:available iodins content o~ approximately 1.75% a~d is to be dilu~ted a~cording to apelicaeion to an available iodine :~35 conte~t:~om 175 ppm to 25 ppm.
~ ':
- . . - . .. .. .. . .
... ... .. . .
.
3~65~
-2~MPIE 4 Low foam Po-~-der deterqent sanitizer for the food industrv par t8 by weight monyl phenol ethoxyla~e (7 mol ethoxy) 14.5 iodine 1.2 potassium xylene sulfonate (solid~ 16.0 sulfamic acid 9.0 sodium bisul~ate tanhydrous) 5.0 urea 54.3 LO
The idoine was ~issolved in a no~mal manner into non-ionic surface active aqent. The dark paste obtained ~as mi~ed with the rest of the dry ingredients ~o produce, after grinding, a free flowi~g powder easily dispersable in water containing lS approximately 1% w/w available iodine. On dilution to a use concentration in water of 25 to 75 ppm a light yellowish/
brown, slightly hazy solution was obtained.
EXAMPLE S
__ ;~ Water Treatment Com~osition ll.Okg o~ finely powdered iodine was added to 50.Okg of nonylphenolethoxylate(6 mol ethoxy) and 2.Okg propylene glycol at a temperature of about 40C. The mixture was ~ently sti~red until the iodine dissolved. The resulting solution was cooled to ambient temperature and added to 36.0kg of a 40% solution of sodium comeno sul~onate and l.Okg of 75% phosphoric acid with sufficient mi~ing until an even homoqeneous ~luid was obtained.
EXAMYLE 6 ."-; :-Water Treatment~
To a swimming pool containing som3 of water 200mL of a composition, as described in the-following example, was adde~ slowly a~d with simultaneous stirring to approx. lO.OL
of water in a bucket. The resulti~g turbid solutio~ was then added in small portion~ to vario~s~parts of he swimmin~
pool. A le~el of 0.2ppm was maintained daily, additions to the swimmi~ pool o~ half the quantity of the composition (lOOmL) in the ma~ner described.
,:
, ~,,, . . - .
,
E~AMPLE 2 Low _oamina deter~ent for clQsed circuit cleanina o~ sofe and.similar fillina equiPment.
parts by weight S couolymer of ethylene oxide with propylene oxide~ ~o,o sodium salt of cumene sulfonate 40~ 150.0 tetrapotassium polyphosphate 100.0 disodium ethylene diaminetetraacetate 20.0 water to make lOOO.OmL
(Teric PE 61, available from I.C.I. LTD. UK
o~ Plurionic L 61 from Wyandotte Chemical Corp. USA.) :
Deteraent - sanitizer ~or the dair~ industrY
parts by weight nonyl phenol ethoxylate(7 mol ethoxy) 21.0 nonyl phenol ethoxylate(5 mol ethoxy~ 1.5 iodine 1.9 ~; 20 sodium cumene sulfonate 35.0 phosphoric acid 95~ 160.0 " water, ~o make lOOO.OmL
~`
The iodine was dissolved by stirring it in the excess of the nonyl phenol ethoxylate(7 mol ethoxy), to complex the iodine. at a tempe~ature between 45 to 60C until all iodine has gone into solution whereupon the rest of the nonyl phenol ethoxylate was added. The resulting mixture was cooled to ambient~ tempeLatU~e and added wi~h light agitation to the : mixture of t~e sodium cumene sulfonate, phosphoric acid and water until a homoqeneous solution was ob~ained.
~:~: The detergent sanitizer concent~ate thus obtained has .
;~ an:available iodins content o~ approximately 1.75% a~d is to be dilu~ted a~cording to apelicaeion to an available iodine :~35 conte~t:~om 175 ppm to 25 ppm.
~ ':
- . . - . .. .. .. . .
... ... .. . .
.
3~65~
-2~MPIE 4 Low foam Po-~-der deterqent sanitizer for the food industrv par t8 by weight monyl phenol ethoxyla~e (7 mol ethoxy) 14.5 iodine 1.2 potassium xylene sulfonate (solid~ 16.0 sulfamic acid 9.0 sodium bisul~ate tanhydrous) 5.0 urea 54.3 LO
The idoine was ~issolved in a no~mal manner into non-ionic surface active aqent. The dark paste obtained ~as mi~ed with the rest of the dry ingredients ~o produce, after grinding, a free flowi~g powder easily dispersable in water containing lS approximately 1% w/w available iodine. On dilution to a use concentration in water of 25 to 75 ppm a light yellowish/
brown, slightly hazy solution was obtained.
EXAMPLE S
__ ;~ Water Treatment Com~osition ll.Okg o~ finely powdered iodine was added to 50.Okg of nonylphenolethoxylate(6 mol ethoxy) and 2.Okg propylene glycol at a temperature of about 40C. The mixture was ~ently sti~red until the iodine dissolved. The resulting solution was cooled to ambient temperature and added to 36.0kg of a 40% solution of sodium comeno sul~onate and l.Okg of 75% phosphoric acid with sufficient mi~ing until an even homoqeneous ~luid was obtained.
EXAMYLE 6 ."-; :-Water Treatment~
To a swimming pool containing som3 of water 200mL of a composition, as described in the-following example, was adde~ slowly a~d with simultaneous stirring to approx. lO.OL
of water in a bucket. The resulti~g turbid solutio~ was then added in small portion~ to vario~s~parts of he swimmin~
pool. A le~el of 0.2ppm was maintained daily, additions to the swimmi~ pool o~ half the quantity of the composition (lOOmL) in the ma~ner described.
,:
, ~,,, . . - .
,
Claims (17)
1. A low-foaming composition comprising not less than 1% by weight of a first non-ionic surface active agent having a cloud point of less than 40°C in a 1% aqueous solution; and not less than 0.25% by weight of a hydrotrope and optionally a co-solvent for said surface active agent, the said hydrotrope being an alkylated benzene or a naphthalene sulfonate water soluble salt of an inorganic or organic base or urea.
2. A composition as defined in claim 1, further comprising a second-non-ionic surface agent having a cloud point of less than 40°C in a 1% aqueous solution and having a lower hydrophilic-lipophilic balance than said first surface active agent.
3. A composition as defined in claim 1, wherein said first surface active agent contains up to about 30% by weight of available iodine in the form of an iodophor.
4. A composition as defined in claim 2, wherein one or both of said first and second surface active agents contains up to about 30% by weight of available iodine in the form of an iodophor.
5. A composition as defined in claim 1, wherein the first surface active agent is an ethylene oxide condensate with an alkyl or dialkyl phenol, a fatty acid alcohol or acid, or a copolymer of ethylene oxide and propylene oxide.
6. A composition as defined in claim 2, wherein the first or second surface active agent is an ethylene oxide condensate with an alkyl or dialkyl phenol, a fatty acid alcohol or acid, or a copolymer of ethylene oxide and propylene oxide.
7. A composition as defined in claim 5 or claim 6, wherein the ethylene oxide condensate with an alkyl or dialkyl phenol has 5 to 7 ethoxy groups per molecule.
8. A composition as defined in claim 1 wherein the hydrotrope is a water soluble salt of the toluene sulfonate, xylene sulfonate, cumene sulfonate or naphthalene sulfonate.
9. A composition as defined in claim 8, wherein the hydrotrope is cumene sulfonate.
10. A composition as defined in claim 1, wherein the co-solvent is a lower alcohol, propylene glycol or polyethylene glycol.
11. A composition as defined in claim 10, wherein the co-solvent is propylene glycol.
12. A composition as defined in claim 3, further comprising sufficient acid such that the composition, at use dilution, has a pH value of less than about 5.
13. A composition as defined in claim 12, wherein the pH-value is between about 1.5 and about 5.
14. A composition as defined in claim 13, wherein the pH-value is between about 3 and about 5.
15. A composition as defined in claim 12, wherein said acid is phosphoric acid, sulfamic acid, sulfuric acid, hydrochloric acid or a mixture of two or more thereof.
16. A composition as defined in claim 15, wherein said acid is phosphoric acid or sulfamic acid or a mixture thereof.
17. A method of treating water, which comprises adding to said water sufficient of a composition as defined in claim 3, or 4, to achieve a concentration of available iodine of 0.1ppm to 10ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000522229A CA1306654C (en) | 1986-11-05 | 1986-11-05 | Low-foaming compositions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000522229A CA1306654C (en) | 1986-11-05 | 1986-11-05 | Low-foaming compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1306654C true CA1306654C (en) | 1992-08-25 |
Family
ID=4134296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000522229A Expired - Lifetime CA1306654C (en) | 1986-11-05 | 1986-11-05 | Low-foaming compositions |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1306654C (en) |
-
1986
- 1986-11-05 CA CA000522229A patent/CA1306654C/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |