WO1993016154A1 - Process for making detergent granules by neutralisation of sulphonic acids - Google Patents

Process for making detergent granules by neutralisation of sulphonic acids Download PDF

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Publication number
WO1993016154A1
WO1993016154A1 PCT/US1993/000736 US9300736W WO9316154A1 WO 1993016154 A1 WO1993016154 A1 WO 1993016154A1 US 9300736 W US9300736 W US 9300736W WO 9316154 A1 WO9316154 A1 WO 9316154A1
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WO
WIPO (PCT)
Prior art keywords
detergent
neutralisation
anionic surfactant
neutralising agent
agglomerate
Prior art date
Application number
PCT/US1993/000736
Other languages
French (fr)
Inventor
Andrew Dorset
Olivier Paquatte
Original Assignee
The Procter & Gamble Company
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
Application filed by The Procter & Gamble Company filed Critical The Procter & Gamble Company
Priority to US08/284,591 priority Critical patent/US5486317A/en
Priority to JP51410093A priority patent/JP3295083B2/en
Publication of WO1993016154A1 publication Critical patent/WO1993016154A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/06—Powder; Flakes; Free-flowing mixtures; Sheets
    • C11D17/065—High-density particulate detergent compositions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • C11D11/04—Special methods for preparing compositions containing mixtures of detergents by chemical means, e.g. by sulfonating in the presence of other compounding ingredients followed by neutralising

Definitions

  • the present invention relates to a process for dry neutralisation of sulphonic acids and to detergent compositions made by this process.
  • Granular detergents have so far been principally prepared by spray drying.
  • the detergent components such as surfactants and builders, are mixed with as much as 35-50% water to form a slurry.
  • the slurry obtained is heated and spray dried which requires high energy input and expensive equipment. An efficient method of processing detergents without slurrying in water and then subsequently drying would be less expensive.
  • the detergent granules made by the invention have a bulk density greater than 650 g/1.
  • Japanese Pat. No. 60 072 999 discloses a batch process whereby a detergent sulphonic acid, sodium carbonate, water and other optional ingredients are brought together in a high shear mixer followed by cooling to 40°C or below and pulverising with zeolite powder and granulating.
  • EP A 0 420 317 published April 3, 1991, discloses a continuous process whereby a detergent sulphonic acid, particulate inorganic material, water and other optional ingredients are brought together in a high speed mixer/densifier. Material is subsequently treated in a moderate speed granulator/densifier. Addition of fine powders in the second step, or between the first and second step, is described as beneficial for the agglomeration process.
  • the present invention relates to a process for making a detergent particle by neutralisation of the acid form of an anionic surfactant in a high shear mixer by a stoichiometric excess of finely divided particulate neutralising agent having an average particle size of less than 5 ⁇ m.
  • the present invention also encompasses free-flowing detergent compositions made with the process. Detailed Description of the Invention
  • a stream of dry powder ingredients is fed into a high shear mixer where it is mixed with a liquid or paste stream of anionic surfactant acid and, optionally, other liquid binders.
  • the powder stream comprises a particulate neutralising agent, typically an alkali inorganic salt, and neutralisation starts in the high shear mixer and continues during subsequent processing. It is a characteristic of the invention that the particulate neutralising agent in the powder stream is in the form of a finely ground powder.
  • the powder stream contains a particulate neutralising agent.
  • Preferred neutralising agents include any of the salts of carbonate or bicarbonate or mixtures thereof. Especially suitable is calcium or sodium carbonate.
  • the neutralising agent should be present in a stoichiometric excess over the anionic surfactant acid. Preferably at least five times as much neutralising agent should be present than is required for stoichiometric neutralisation.
  • the powder stream may also contain any other suitable detergent powders.
  • Preferred powders are those which are active in the detergency process. This includes zeolites, sodium tripolyphosphate, silica, silicates, polymers including copolymers of maleic and acrylic acid, carboxymethyl cellulose, optical brighteners, ethylene diamine tetra acetic acid and inorganic salts such as sulphates.
  • Other suitable ingredients, including additional surfactants, that may be handled as solids are described later.
  • the average particle size of the neutralising agent should be less than 5 ⁇ m. The definitions for average particle size are given below.
  • the high specific surface area of the particulate neutralising agent improves the efficiency of the neutralisation reaction.
  • a narrow range of particle size distribution is preferred, as well as a small average particle size.
  • Preferably 90% of the particles by volume have an equivalent particle size of less than lO ⁇ m.
  • the particle size of any given particle is taken to be the diameter of a spherical particle occupying the same volume as the given particle.
  • the average (or median) particle size is taken to be the particle size which has 50% of the particles by volume smaller than that particle size.
  • any type of mill suitable for grinding the particulate neutralising agent to the desired particle size may be used.
  • a pan-cake jet mill provided by Trade Microniser, Kent, England and an air classifier mill, supplied by Hosokawa Micron have been found to be particularly suitable.
  • Useful anionic surfactant acids include organic sulphuric reaction products having in their molecular structure an alkyl group containing from about 9 to about 20 carbon atoms and a sulphonic acid.
  • this group of synthetic surfactants are the alkyl benzene sulphonic acids in which the alkyl group contains from about 9 to about 15 carbon atoms in straight or branched chain configuration.
  • anionic surfactant acids are linear alkyl benzene sulphonates in which the alkyl group contains from about 11 to about 13 carbon atoms.
  • Other useful surfactant acids include alpha sulphonated fatty acid methyl esters, olefin sulphonates and beta alkyloxy alkane sulphonates. Mixtures of the above may also be used.
  • liquids may be sprayed into the high shear mixer including amino polyphosphates , diethylene triamine penta acetic acid and additional anionic surfactants (as neutralised salts) , nonionic, cationic, ampholytic and zwitterionic surfactants.
  • Especially suitable amino polyphosphonates include diethylene triamine penta methylene phosphonic acid and ethylene diamine tetra methylene phosphonic acid.
  • Especially suitable additional anionic surfactants are water-soluble salts of the higher fatty acids.
  • Soaps can be made by direct saponification of fats and oils or by the neutralization of free fatty acids.
  • Particularly useful are the sodium and potassium salts of the mixtures of fatty acids derived from coconut oil and tallow, i.e., sodium or potassium tallow and coconut soap.
  • Useful anionic surfactants also include the water- soluble salts, preferably the alkali metal, ammonium and alkylolammonium salts, of organic sulfuric reaction products having in their molecular structure an alkyl group containing from about 10 to about 20 carbon atoms and a sulfonic acid or sulfuric acid ester group.
  • alkyl is the alkyl portion of acyl groups.
  • Examples of this group of synthetic surfactants are the sodium and potassium alkyl sulfates, especially those obtained by sulfating the higher alcohols (C 8 -c 18 carbon atoms) such as those produced by reducing the glycerides of tallow or coconut oil
  • anionic surfactants herein are the sodium or potassium salts of alkyl phenol ethylene oxide ether sulfates containing from about 1 to about 10 units of ethylene oxide per molecule and wherein the alkyl groups contain from about 8 to about 12 carbon atoms; and sodium or potassium salts of alkyl ethylene oxide ether sulfates containing from about 1 to about 10 units of ethylene oxide per molecule and wherein the alkyl group contains from about 10 to about 20 carbon atoms.
  • Water-soluble nonionic surfactants are also useful as secondary surfactant in the compositions of the invention.
  • a particularly preferred paste comprises a blend of nonionic and anionic surfactants having a ratio of from about 0.01:1 to about 1:1, more preferably about 0.05:1.
  • Nonionics can be used up to an equal amount of the primary organic surfactant.
  • Such nonionic materials include compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an organic hydrophobic compound, which may be aliphatic or alkyl aromatic in nature. The length of the polyoxyalkylene group which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.
  • Suitable nonionic surfactants include the polyethylene oxide condensates of alkyl phenols, e.g., the condensation products of alkyl phenols having an alkyl group containing from about 6 to 16 carbon atoms, in either a straight chain or branched chain configuration, with from about 4 to 25 moles of ethylene oxide per mole of alkyl phenol.
  • Preferred nonionics are the water-soluble condensation products of aliphatic alcohols containing from 8 to 22 carbon atoms, in either straight chain or branched configuration, with from 4 to 25 moles of ethylene oxide per more of alcohol. Particularly preferred are the condensation products of alcohols having an alkyl group containing from about 9 to 15 carbon atoms with from about 4 to 25 moles of ethylene oxide per mole of alcohol; and condensation products of propylene glycol with ethylene oxide.
  • Semi-polar nonionic surfactants include water-soluble amine oxides containing one alkyl moiety of from about 10 to 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from 1 to about 3 carbon atoms; water-soluble phosphine oxides containing one alkyl moiety of about 10 to 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from about 1 to 3 carbon atoms; and water- soluble sulfoxides containing one alkyl moiety of from about 10 to 18 carbon atoms and a moiety selected from the group consisting of alkyl and hydroxyalkyl moieties of from about 1 to 3 carbon atoms.
  • Ampholytic surfactants include derivatives of aliphatic or aliphatic derivatives of heterocyclic secondary and tertiary amines in which the aliphatic moiety can be either straight or branched chain and wherein one of the aliphatic substituents contains from about 8 to 18 carbon atoms and at least one aliphatic substituent contains an anionic water-solubilizing group.
  • Zwitterionic surfactants include derivatives of aliphatic quaternary ammonium phosphonium, and sulfonium compounds in which one of the aliphatic substituents contains from about 8 to 18 carbon atoms.
  • Useful cationic surfactants include water-soluble quaternary ammonium compounds of the form R4R5R RyN + X ⁇ , wherein R 4 is alkyl having from 10 to 20, preferably from
  • R5 12-18 carbon atoms, and R5, Rg and R7 are each C ⁇ to C7 alkyl preferably methyl;
  • X" is an anion, e.g. chloride.
  • trimethyl ammonium compounds include C 2- 1 4 alkyl trimethyl ammonium chloride and cocalkyl trimethyl ammonium ethosulfate.
  • liquid ingredients anionic surfactant acids and binders
  • powder ingredients are limited by the stickiness of the powder produced.
  • a ratio from 1:1 to 1:4 is preferred. Most preferred is from 1:2 to 1:3.
  • a preferred high shear mixer is the Loedige R CB series manufactured by Loedige Maschinenbau GmbH, Paderhorn, Germany. Operated at speed range from 500 to 2000 rpm and preferably cooled to maintain the temperature below 40°C.
  • the residence time is from 5 to 30 seconds, preferably about 10 seconds.
  • the resulting granules should be further processed to give finished agglomerates as described below.
  • Other suitable high shear mixers are believed to be Zig-Zag Blenders manufactured by P K Niro, Denmark.
  • the Eirich R batch mixers manufactured by Gustau Eirich, Hardhei , Germany.
  • the agglomerates may be formed directly with a mixing time of about 1 minute without the need for further processing.
  • the powder stream may be fed to the high shear mixer by any- suitable powder handling and conveying system.
  • anionic surfactant acid and any other liquid binders will normally be pumped into the high shear mixers through conventional nozzles including spray nozzles.
  • the granules made by the process described hereinabove are suitable for further processing into detergent agglomerates.
  • This further processing includes the continuing neutralisation of the anionic surfactant acid by the particulate neutralising agent. This may be achieved by further mixing in a moderate speed granulator.
  • Suitable mixers include the Loedige R KM mixers.
  • Residence time is from 1 to 10 minutes, preferably about 5 minutes, with cooling if necessary. Additional liquid or powder streams may optionally be added to the moderate speed granulator, or between the two mixers. Any suitable detergent ingredient may be used, including any of those previously described above.
  • the resulting particles may then be dried in one or more cooling or drying steps.
  • Suitable equipment includes commercially available fluid bed driers and air lifts.
  • Fine particles may be removed from the final powder stream and may be recycled into the process via the high shear mixer. Any commercially available air separation equipment, in combination, if necessary with suitable filters may be used. Suitable techniques will be familiar to the man skilled in the art. If fines removal and recycling is effectively carried out, then there will be little or no finely ground particulate neutralising agent detectable in the finished composition. However if the fines removal and recycling operation are not carried out, or are not carried out effectively, then there may some finely ground particulate neutralising agent present in the finished composition.
  • the resulting agglomerates should have a bulk density greater than 650 g/1 and should be crisp particles of low porosity.
  • the agglomerates may be mixed with other powder ingredients to give a free-flowing granular detergent composition. Alternatively the agglomerates themselves may be used as the finished composition.
  • a detergent composition made according to the present invention should comprise from 50% to 100% by weight of the agglomerates, preferably from 80% to 100%.
  • detergent ingredients may be sprayed on to the granular detergent, for example, nonionic surfactants, perfumes, or added as dry powders to the agglomerates, for example, bleach and bleach activators, enzymes, polymers including polyethylene glycol
  • the detergent agglomerate was prepared by dry neutralization of C11-C13 linear alkyl benzene sulphonate with sodium carbonate.
  • the sodium carbonate (light soda ash ex ICI) was prepared to 5 different particle sizes as defined in samples A to E.
  • Carbonate particle size is measured in a MALVERN series 2600 laser particle sizer. The median indicates that 50% by volume of the particles measured are smaller than the particle size given in that row of the table. ⁇ 90% indicates that 90% by volume of the particles measured are smaller than the particle size given in that row of the table.
  • the following ingredients were mixed in an Eirich (batch) mixer.
  • the powder ingredients were charged to the mixer first.
  • the liquid ingredients were added last and the resultant agglomerate was formed during a mixing period of 1 minute.
  • the bleachable stain removal is measured as follows: finished product is prepared by mixing 85% by weight of agglomerates with 15% by weight of sodium perborate mixed with a bleach activator. We use a NATIONAL semi automatic Lab J28 twin tub Japanese washing machine. The finished product (70 g) is poured in 30L of water (water hardness is 2.0 mmol Ca 2+ /L, water temperature is 30°C) containing 1 to 2 kg of preferably soiled load and a set of bleachable stains (coffee, tea, black grapes, etc).
  • the overall bleachable stain removal profile of the agglomerate finish product is compared to that of an identical formula prepared by a conventional spray-drying process.
  • the scale goes from -4 to +4 Panel Score Units (PSU) , the product scores 0 if it has the same stain removal profile as the reference, a negative number on the PSU scale indicates that the test product performs worse than the reference.
  • PSU Panel Score Unit
  • the agglomerate cake strength is measured as follows: we put lOOg of agglomerate in a test pot and we subject the sample to a 10 kg load for 2 min. The resulting cake formed is then broken by a traversing needle. The force needed to break the cake is recorded on a scale from 0 to 11 pounds. We target for a product which scores between 0 (the cake breaks easily) to 3 (upper limit for acceptable cake strength) .
  • Solubility grades are measured as follows: we pour 90 g of finish product (prepared in the same way as in section 2.) in an acrylic pouch (20x40cm) . The pouch is closed by sewing it, and is put in the same type of washing machine as in section 2 in 30L of water at 30 ° C containing 1.5 kg of clean load. After 10 minutes of gentle agitation the pouch is opened and graded with regard to undissolved detergent products remaining on the fabric, on a scale from 0 (bad) to 4 (excellent) . We have set a solubility grade target of 3 and above based on the evaluation of granular detergents currently on the market.
  • Agglomerate mean particle size is measured on a standard Tyler sieve. The corresponding weight fractions were converted to a log normal distribution, from which average particle size is recorded.
  • agglomerates and finished compositions made according to the invention from sample A (the most finely ground carbonate) give significant benefits in cleaning performance and physical characteristics, when compared to the agglomerates and finished compositions made from samples B-E (carbonates with particle size outside of the present claimed range) .
  • the above results also show that the finished detergent composition made according to the present invention from sample A show a cleaning performance comparable to an identical composition made by a conventional spray-dry process.

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Abstract

The present invention relates to a process for making a detergent particle by neutralisation of the acid form of an anionic surfactant in a high shear mixer by a stoichiometric excess of finely divided particulate neutralising agent having an average particle size of less than 5 νm. The present invention also encompasses free-flowing detergent compositions made with the process.

Description

PROCESS FOR
MAKING DETERGENT GRANULES BY NEUTRALISATION
OF SULPHONIC ACIDS
Field of the Invention
The present invention relates to a process for dry neutralisation of sulphonic acids and to detergent compositions made by this process.
Background of the Invention
Granular detergents have so far been principally prepared by spray drying. In the spray drying process the detergent components, such as surfactants and builders, are mixed with as much as 35-50% water to form a slurry. The slurry obtained is heated and spray dried which requires high energy input and expensive equipment. An efficient method of processing detergents without slurrying in water and then subsequently drying would be less expensive.
Processes for "dry" neutralisation (ie essentially water free) are well-known and practiced by detergent manufacturers in the manufacture of detergent granules of high bulk density, in particular for the neutralisation of acid forms of anionic surfactants.
There is a need however to produce agglomerates that have cleaning performance comparable with conventional spray-dried granules.
It has been discovered that the rate and the completeness of the neutralisation reaction can have an impact on the performance and rate of solubility of the detergent granules and therefore represent an important consideration for the commercial application of such a process.
It has now been surprisingly found that the use of finely ground particulate neutralising agent of a narrowly defined particle size optimises the said neutralisation reaction, and in so doing, realises benefits in the performance and rate of solubility of detergent granules of high bulk density made by such "dry" neutralisation processes. The detergent granules made by the invention have a bulk density greater than 650 g/1.
US Pat. No. 4 515 707, published May 7 , 1985, describes a process for dry neutralisation of a detergent sulphuric or sulphonic acid with sodium carbonate powder in the presence of powdered sodium tripolyphosphate in a high shear mixer. The resulting powder is used in the manufacture of solid detergent bars.
Japanese Pat. No. 60 072 999 discloses a batch process whereby a detergent sulphonic acid, sodium carbonate, water and other optional ingredients are brought together in a high shear mixer followed by cooling to 40°C or below and pulverising with zeolite powder and granulating.
EP A 0 420 317, published April 3, 1991, discloses a continuous process whereby a detergent sulphonic acid, particulate inorganic material, water and other optional ingredients are brought together in a high speed mixer/densifier. Material is subsequently treated in a moderate speed granulator/densifier. Addition of fine powders in the second step, or between the first and second step, is described as beneficial for the agglomeration process.
EP A 0 430 603, published June 5, 1991, discloses a process for preparing high active detergent agglomerates using a finely divided particulate filler with a high oil absorption value as a processing aid for the agglomeration step.
Summary of the Invention
The present invention relates to a process for making a detergent particle by neutralisation of the acid form of an anionic surfactant in a high shear mixer by a stoichiometric excess of finely divided particulate neutralising agent having an average particle size of less than 5μm.
The present invention also encompasses free-flowing detergent compositions made with the process. Detailed Description of the Invention
A stream of dry powder ingredients is fed into a high shear mixer where it is mixed with a liquid or paste stream of anionic surfactant acid and, optionally, other liquid binders. The powder stream comprises a particulate neutralising agent, typically an alkali inorganic salt, and neutralisation starts in the high shear mixer and continues during subsequent processing. It is a characteristic of the invention that the particulate neutralising agent in the powder stream is in the form of a finely ground powder.
THE POWDER STREAM
The powder stream contains a particulate neutralising agent. Preferred neutralising agents include any of the salts of carbonate or bicarbonate or mixtures thereof. Especially suitable is calcium or sodium carbonate. The neutralising agent should be present in a stoichiometric excess over the anionic surfactant acid. Preferably at least five times as much neutralising agent should be present than is required for stoichiometric neutralisation.
The powder stream may also contain any other suitable detergent powders. Preferred powders are those which are active in the detergency process. This includes zeolites, sodium tripolyphosphate, silica, silicates, polymers including copolymers of maleic and acrylic acid, carboxymethyl cellulose, optical brighteners, ethylene diamine tetra acetic acid and inorganic salts such as sulphates. Other suitable ingredients, including additional surfactants, that may be handled as solids are described later.
It has been found that use of a finely ground particulate neutralising agent improves the cleaning performance, solubility characteristics and cake strength of the final detergent composition. The average particle size of the neutralising agent should be less than 5μm. The definitions for average particle size are given below.
It is believed that the high specific surface area of the particulate neutralising agent improves the efficiency of the neutralisation reaction. A narrow range of particle size distribution is preferred, as well as a small average particle size. Preferably 90% of the particles by volume have an equivalent particle size of less than lOμm.
MEAN PARTICLE SIZE
The definitions of the terms particle size and average particle size as used herein are given below:
The particle size of any given particle is taken to be the diameter of a spherical particle occupying the same volume as the given particle.
The average (or median) particle size is taken to be the particle size which has 50% of the particles by volume smaller than that particle size.
All of the data for particle sizes of the particulate neutralising agent used herein have been measured on a Malvern series 2600 optical laser.
Any type of mill suitable for grinding the particulate neutralising agent to the desired particle size may be used. A pan-cake jet mill provided by Trade Microniser, Kent, England and an air classifier mill, supplied by Hosokawa Micron have been found to be particularly suitable. THE ANIONIC SURFACTANT
Useful anionic surfactant acids include organic sulphuric reaction products having in their molecular structure an alkyl group containing from about 9 to about 20 carbon atoms and a sulphonic acid. Examples of this group of synthetic surfactants are the alkyl benzene sulphonic acids in which the alkyl group contains from about 9 to about 15 carbon atoms in straight or branched chain configuration.
Especially suitable anionic surfactant acids are linear alkyl benzene sulphonates in which the alkyl group contains from about 11 to about 13 carbon atoms. Other useful surfactant acids include alpha sulphonated fatty acid methyl esters, olefin sulphonates and beta alkyloxy alkane sulphonates. Mixtures of the above may also be used.
OTHER LIQUID BINDERS
Other liquids may be sprayed into the high shear mixer including amino polyphosphates , diethylene triamine penta acetic acid and additional anionic surfactants (as neutralised salts) , nonionic, cationic, ampholytic and zwitterionic surfactants.
Especially suitable amino polyphosphonates include diethylene triamine penta methylene phosphonic acid and ethylene diamine tetra methylene phosphonic acid.
Especially suitable additional anionic surfactants are water-soluble salts of the higher fatty acids. This includes water-soluble salts of the higher fatty acids, i.e., "soaps", are useful anionic surfactants in the compositions herein. This includes alkali metal soaps such as the sodium, potassium, ammonium, and alkylammonium salts of higher fatty acids containing from about 8 to about 24 carbon atoms, and preferably from about 12 to about 18 carbon atoms. Soaps can be made by direct saponification of fats and oils or by the neutralization of free fatty acids. Particularly useful are the sodium and potassium salts of the mixtures of fatty acids derived from coconut oil and tallow, i.e., sodium or potassium tallow and coconut soap.
Useful anionic surfactants also include the water- soluble salts, preferably the alkali metal, ammonium and alkylolammonium salts, of organic sulfuric reaction products having in their molecular structure an alkyl group containing from about 10 to about 20 carbon atoms and a sulfonic acid or sulfuric acid ester group. (Included in the term "alkyl" is the alkyl portion of acyl groups.) Examples of this group of synthetic surfactants are the sodium and potassium alkyl sulfates, especially those obtained by sulfating the higher alcohols (C8-c18 carbon atoms) such as those produced by reducing the glycerides of tallow or coconut oil
Other anionic surfactants herein are the sodium or potassium salts of alkyl phenol ethylene oxide ether sulfates containing from about 1 to about 10 units of ethylene oxide per molecule and wherein the alkyl groups contain from about 8 to about 12 carbon atoms; and sodium or potassium salts of alkyl ethylene oxide ether sulfates containing from about 1 to about 10 units of ethylene oxide per molecule and wherein the alkyl group contains from about 10 to about 20 carbon atoms.
Water-soluble nonionic surfactants are also useful as secondary surfactant in the compositions of the invention. A particularly preferred paste comprises a blend of nonionic and anionic surfactants having a ratio of from about 0.01:1 to about 1:1, more preferably about 0.05:1. Nonionics can be used up to an equal amount of the primary organic surfactant. Such nonionic materials include compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an organic hydrophobic compound, which may be aliphatic or alkyl aromatic in nature. The length of the polyoxyalkylene group which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.
Suitable nonionic surfactants include the polyethylene oxide condensates of alkyl phenols, e.g., the condensation products of alkyl phenols having an alkyl group containing from about 6 to 16 carbon atoms, in either a straight chain or branched chain configuration, with from about 4 to 25 moles of ethylene oxide per mole of alkyl phenol.
Preferred nonionics are the water-soluble condensation products of aliphatic alcohols containing from 8 to 22 carbon atoms, in either straight chain or branched configuration, with from 4 to 25 moles of ethylene oxide per more of alcohol. Particularly preferred are the condensation products of alcohols having an alkyl group containing from about 9 to 15 carbon atoms with from about 4 to 25 moles of ethylene oxide per mole of alcohol; and condensation products of propylene glycol with ethylene oxide.
Semi-polar nonionic surfactants include water-soluble amine oxides containing one alkyl moiety of from about 10 to 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from 1 to about 3 carbon atoms; water-soluble phosphine oxides containing one alkyl moiety of about 10 to 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from about 1 to 3 carbon atoms; and water- soluble sulfoxides containing one alkyl moiety of from about 10 to 18 carbon atoms and a moiety selected from the group consisting of alkyl and hydroxyalkyl moieties of from about 1 to 3 carbon atoms.
Ampholytic surfactants include derivatives of aliphatic or aliphatic derivatives of heterocyclic secondary and tertiary amines in which the aliphatic moiety can be either straight or branched chain and wherein one of the aliphatic substituents contains from about 8 to 18 carbon atoms and at least one aliphatic substituent contains an anionic water-solubilizing group.
Zwitterionic surfactants include derivatives of aliphatic quaternary ammonium phosphonium, and sulfonium compounds in which one of the aliphatic substituents contains from about 8 to 18 carbon atoms.
Useful cationic surfactants include water-soluble quaternary ammonium compounds of the form R4R5R RyN+X~, wherein R4 is alkyl having from 10 to 20, preferably from
12-18 carbon atoms, and R5, Rg and R7 are each C^ to C7 alkyl preferably methyl; X" is an anion, e.g. chloride. Examples of such trimethyl ammonium compounds include C 2- 14 alkyl trimethyl ammonium chloride and cocalkyl trimethyl ammonium ethosulfate.
Note that some of these components may be handled in solid form in which case they should be considered as part of the powder stream rather than liquid binders.
RATIO OF ANIONIC SURFACTANT/BINDERS TO POWDER STREAM
The ratio of liquid ingredients (anionic surfactant acids and binders) to powder ingredients is limited by the stickiness of the powder produced. A ratio from 1:1 to 1:4 is preferred. Most preferred is from 1:2 to 1:3.
HIGH SHEAR MIXER A preferred high shear mixer is the Loedige R CB series manufactured by Loedige Maschinenbau GmbH, Paderhorn, Germany. Operated at speed range from 500 to 2000 rpm and preferably cooled to maintain the temperature below 40°C.
The residence time is from 5 to 30 seconds, preferably about 10 seconds. The resulting granules should be further processed to give finished agglomerates as described below. Other suitable high shear mixers are believed to be Zig-Zag Blenders manufactured by P K Niro, Denmark.
Also suitable are the Eirich R batch mixers manufactured by Gustau Eirich, Hardhei , Germany. In this type of batch mixer the agglomerates may be formed directly with a mixing time of about 1 minute without the need for further processing.
The powder stream may be fed to the high shear mixer by any- suitable powder handling and conveying system.
The anionic surfactant acid and any other liquid binders will normally be pumped into the high shear mixers through conventional nozzles including spray nozzles.
FURTHER PROCESSING OF THE DETERGENT GRANULES
The granules made by the process described hereinabove are suitable for further processing into detergent agglomerates. This further processing includes the continuing neutralisation of the anionic surfactant acid by the particulate neutralising agent. This may be achieved by further mixing in a moderate speed granulator. Suitable mixers include the Loedige R KM mixers.
Residence time is from 1 to 10 minutes, preferably about 5 minutes, with cooling if necessary. Additional liquid or powder streams may optionally be added to the moderate speed granulator, or between the two mixers. Any suitable detergent ingredient may be used, including any of those previously described above.
The resulting particles may then be dried in one or more cooling or drying steps. Suitable equipment includes commercially available fluid bed driers and air lifts.
FINES RECYCLING
Fine particles (less than about 150 μm) may be removed from the final powder stream and may be recycled into the process via the high shear mixer. Any commercially available air separation equipment, in combination, if necessary with suitable filters may be used. Suitable techniques will be familiar to the man skilled in the art. If fines removal and recycling is effectively carried out, then there will be little or no finely ground particulate neutralising agent detectable in the finished composition. However if the fines removal and recycling operation are not carried out, or are not carried out effectively, then there may some finely ground particulate neutralising agent present in the finished composition.
The resulting agglomerates should have a bulk density greater than 650 g/1 and should be crisp particles of low porosity.
FINISHED DETERGENT COMPOSITION
The agglomerates may be mixed with other powder ingredients to give a free-flowing granular detergent composition. Alternatively the agglomerates themselves may be used as the finished composition. A detergent composition made according to the present invention should comprise from 50% to 100% by weight of the agglomerates, preferably from 80% to 100%.
Other detergent ingredients may be sprayed on to the granular detergent, for example, nonionic surfactants, perfumes, or added as dry powders to the agglomerates, for example, bleach and bleach activators, enzymes, polymers including polyethylene glycol
EXAMPLE
The detergent agglomerate was prepared by dry neutralization of C11-C13 linear alkyl benzene sulphonate with sodium carbonate. The sodium carbonate (light soda ash ex ICI) was prepared to 5 different particle sizes as defined in samples A to E.
A) Carbonate ground in a pancake jet mill (ex Trade Micronizing)
B) Carbonate ground in an air classifier mill (ex Hosokawa Micron)
C) Carbonate ground in a pin mill (ex Alpine)
D) Carbonate ground in a hammer mill (ex Alpine)
E) Carbonate commercially supplied by ICI (Light soda ash)
A B C D E CARBONATEPARTICLESIZE(urn.1
MEDIAN(<50%) 3.4 5.7 18.3 59.6 73.2
<90% 4.2 15.3 69.1 152.8 209
SPECIFICSURFACEAREA(m2/cc) 1.68 1.31 0.98 0.25 0.25
1. Carbonate particle size is measured in a MALVERN series 2600 laser particle sizer. The median indicates that 50% by volume of the particles measured are smaller than the particle size given in that row of the table. <90% indicates that 90% by volume of the particles measured are smaller than the particle size given in that row of the table.
The following ingredients were mixed in an Eirich (batch) mixer. The powder ingredients were charged to the mixer first. The liquid ingredients were added last and the resultant agglomerate was formed during a mixing period of 1 minute.
Figure imgf000015_0001
The resultant agglomerates coming out of the Eirich, were then prepared for physical properties testing and subsequently made into finished product for performance testing as outlined below.
B E
BLEACHABLE STAIN REMOVAL -0.8 -0.6 -0.7 -1.0 J PSUI1
AGGLOMERATE CAKE STRENGTH2 2.5 6.4 10.5 9.4
SOLUBILITY GRADE3
DENSITY (q/1) 850 822 602 600 664
AGGLOMERATE MEAN PARTICLE 370 336 333 337 347 SIZE (um)4 1. The bleachable stain removal is measured as follows: finished product is prepared by mixing 85% by weight of agglomerates with 15% by weight of sodium perborate mixed with a bleach activator. We use a NATIONAL semi automatic Lab J28 twin tub Japanese washing machine. The finished product (70 g) is poured in 30L of water (water hardness is 2.0 mmol Ca2+/L, water temperature is 30°C) containing 1 to 2 kg of preferably soiled load and a set of bleachable stains (coffee, tea, black grapes, etc...). The overall bleachable stain removal profile of the agglomerate finish product is compared to that of an identical formula prepared by a conventional spray-drying process. The scale goes from -4 to +4 Panel Score Units (PSU) , the product scores 0 if it has the same stain removal profile as the reference, a negative number on the PSU scale indicates that the test product performs worse than the reference.
2. The agglomerate cake strength is measured as follows: we put lOOg of agglomerate in a test pot and we subject the sample to a 10 kg load for 2 min. The resulting cake formed is then broken by a traversing needle. The force needed to break the cake is recorded on a scale from 0 to 11 pounds. We target for a product which scores between 0 (the cake breaks easily) to 3 (upper limit for acceptable cake strength) .
3. Solubility grades are measured as follows: we pour 90 g of finish product (prepared in the same way as in section 2.) in an acrylic pouch (20x40cm) . The pouch is closed by sewing it, and is put in the same type of washing machine as in section 2 in 30L of water at 30°C containing 1.5 kg of clean load. After 10 minutes of gentle agitation the pouch is opened and graded with regard to undissolved detergent products remaining on the fabric, on a scale from 0 (bad) to 4 (excellent) . We have set a solubility grade target of 3 and above based on the evaluation of granular detergents currently on the market.
4. Agglomerate mean particle size is measured on a standard Tyler sieve. The corresponding weight fractions were converted to a log normal distribution, from which average particle size is recorded.
It can be seen that the agglomerates and finished compositions made according to the invention from sample A (the most finely ground carbonate) give significant benefits in cleaning performance and physical characteristics, when compared to the agglomerates and finished compositions made from samples B-E (carbonates with particle size outside of the present claimed range) . The above results also show that the finished detergent composition made according to the present invention from sample A show a cleaning performance comparable to an identical composition made by a conventional spray-dry process.

Claims

WHAT IS CLAIMED IS:
1. A process for making a detergent particle by neutralisation of the acid form of an anionic surfactant (a) in a high shear mixer by a stoichiometric excess of particulate neutralising agent (b) characterised in that the particulate neutralising agent has 50% by volume of particles less than 5μm in diameter.
2. A process according to claim 1 characterised in that 90% by volume of the particulate neutralising agent has a particle size less than 10μm in diameter.
3. A process according to either claim 1 or 2, characterised in that the anionic surfactant (a) is an alkyl benzene sulphonic acid.
4. A process according to any of claims 1 to 3 characterised in that the neutralising agent (b) is a sodium or calcium salt of the carbonate.
5. A process for making a detergent agglomerate by any of the preceding claims, further comprising: (I) agglomerating the detergent particles in a moderate speed granulator/densifier, with or without a separate powder stream, and (II) drying and/or cooling.
6. A detergent agglomerate having a bulk density greater than 650g/l made by the process of claim 5.
7. A detergent agglomerate made by the process of claim 5 characterised in that the level of anionic surfactant salt coming from the neutralisation of the acid form of the anionic surfactant (a) and particulate neutralising agent (b) is less than 40% by weight of the agglomerate.
8. A detergent agglomerate made by the process of claim 5 characterised in that the level of anionic surfactant salt coming from the neutralisation of the acid form of the anionic surfactant (a) and particulate neutralising agent (b) is less than 28% by weight of the agglomerate.
9. A free-flowing granular detergent composition comprising from 50% to 100% by weight of the detergent agglomerates in any of-claims 6 to 8.
10. A free-flowing granular detergent composition comprising from 80% to 100% by weight of the detergent agglomerates in any of claims 6 to 8.
PCT/US1993/000736 1992-02-14 1993-01-27 Process for making detergent granules by neutralisation of sulphonic acids WO1993016154A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996038529A1 (en) * 1995-05-31 1996-12-05 The Procter & Gamble Company Process for making high active, high density detergent granules

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4314885A1 (en) * 1993-05-05 1994-11-10 Sued Chemie Ag Process for neutralizing the acid form of anionic surfactants, agglomerates and detergents obtained thereafter
GB9417354D0 (en) * 1994-08-26 1994-10-19 Unilever Plc Detergent particles and process for their production
US6207635B1 (en) 1995-05-31 2001-03-27 The Procter & Gamble Company Process for manufacture of high density detergent granules
CN1116400C (en) * 1996-02-29 2003-07-30 普罗格特-甘布尔公司 Process for mfg. high density detergent granules
ATE267240T1 (en) * 1996-02-29 2004-06-15 Procter & Gamble METHOD FOR PRODUCING COMPACT DETERGENT GRANULES
TW397862B (en) * 1996-09-06 2000-07-11 Kao Corp Detergent granules and method for producing the same, and high-bulk density detergent composition
DE19700776A1 (en) * 1997-01-13 1998-07-16 Henkel Kgaa Granular detergent with improved fat washing capacity
GB9712583D0 (en) 1997-06-16 1997-08-20 Unilever Plc Production of detergent granulates
GB9712580D0 (en) * 1997-06-16 1997-08-20 Unilever Plc Production of detergent granulates
GB9713748D0 (en) * 1997-06-27 1997-09-03 Unilever Plc Production of detergent granulates
PL188065B1 (en) * 1997-09-12 2004-12-31 Izabella Bogacka Method of obtaining daily personal hygiene agents
DE19844523A1 (en) 1998-09-29 2000-03-30 Henkel Kgaa Granulation process
GB9825563D0 (en) 1998-11-20 1999-01-13 Unilever Plc Particulate laundry detergent compositions containing anionic surfactant granules
DE19855380A1 (en) * 1998-12-01 2000-06-08 Henkel Kgaa Granulation process
GB0023488D0 (en) 2000-09-25 2000-11-08 Unilever Plc Production of anionic surfactant granules by in situ neutralisation
GB0023487D0 (en) 2000-09-25 2000-11-08 Unilever Plc Production of anionic surfactant granules by in situ neutralisation
GB0023489D0 (en) * 2000-09-25 2000-11-08 Unilever Plc Production of anionic surfactant granules by in situ neutralisation
GB0119708D0 (en) 2001-08-13 2001-10-03 Unilever Plc Process for the production of detergent granules
DE10160319B4 (en) * 2001-12-07 2008-05-15 Henkel Kgaa Surfactant granules and process for the preparation of surfactant granules
DE10163603B4 (en) * 2001-12-21 2006-05-04 Henkel Kgaa Process for the preparation of builder-containing surfactant granules
DE10232304B4 (en) * 2002-07-17 2005-10-27 Henkel Kgaa Neutralization in the mixer
DE10258011A1 (en) * 2002-12-12 2004-07-08 Henkel Kgaa Dry neutralization process
CN103773618B (en) * 2014-02-12 2015-04-01 浙江赞宇科技股份有限公司 Process and device for continuously preparing powdery washing powder particles
EP3146034B1 (en) * 2014-05-23 2019-07-10 The Procter and Gamble Company Two-stage neutralization process for forming detergent granules, and products containing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515707A (en) * 1983-06-27 1985-05-07 The Chemithon Corporation Intermediate product for use in producing a detergent bar and method for producing same
US4721580A (en) * 1987-01-07 1988-01-26 The Procter & Gamble Company Anionic end-capped oligomeric esters as soil release agents in detergent compositions
US4919847A (en) * 1988-06-03 1990-04-24 Colgate Palmolive Co. Process for manufacturing particulate detergent composition directly from in situ produced anionic detergent salt
US4970017A (en) * 1985-04-25 1990-11-13 Lion Corporation Process for production of granular detergent composition having high bulk density
US5178798A (en) * 1989-06-09 1993-01-12 The Procter & Gamble Company Formation of detergent granules by deagglomeration of detergent dough

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1404317A (en) * 1971-10-23 1975-08-28 Bell Chemicals Pty Ltd Manufacture of detergent powders
CA1337513C (en) * 1988-07-21 1995-11-07 Michael William Hollingsworth Detergent compositions and process for preparing them
IN170991B (en) * 1988-07-21 1992-06-27 Lever Hindustan Ltd
JPH02273655A (en) * 1989-04-14 1990-11-08 Teika Corp Preparation of long chain organic sulfonic acid metal salt
GB8922018D0 (en) * 1989-09-29 1989-11-15 Unilever Plc Detergent compositions and process for preparing them
GB9001285D0 (en) * 1990-01-19 1990-03-21 Unilever Plc Detergent compositions and process for preparing them

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515707A (en) * 1983-06-27 1985-05-07 The Chemithon Corporation Intermediate product for use in producing a detergent bar and method for producing same
US4970017A (en) * 1985-04-25 1990-11-13 Lion Corporation Process for production of granular detergent composition having high bulk density
US4721580A (en) * 1987-01-07 1988-01-26 The Procter & Gamble Company Anionic end-capped oligomeric esters as soil release agents in detergent compositions
US4919847A (en) * 1988-06-03 1990-04-24 Colgate Palmolive Co. Process for manufacturing particulate detergent composition directly from in situ produced anionic detergent salt
US5178798A (en) * 1989-06-09 1993-01-12 The Procter & Gamble Company Formation of detergent granules by deagglomeration of detergent dough

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996038529A1 (en) * 1995-05-31 1996-12-05 The Procter & Gamble Company Process for making high active, high density detergent granules
CN1117850C (en) * 1995-05-31 2003-08-13 普罗格特-甘布尔公司 Process for making high active, high density detergent granules

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