AU666249B2 - Granulation process - Google Patents
Granulation processInfo
- Publication number
- AU666249B2 AU666249B2 AU56893/94A AU5689394A AU666249B2 AU 666249 B2 AU666249 B2 AU 666249B2 AU 56893/94 A AU56893/94 A AU 56893/94A AU 5689394 A AU5689394 A AU 5689394A AU 666249 B2 AU666249 B2 AU 666249B2
- Authority
- AU
- Australia
- Prior art keywords
- granules
- process according
- binder solution
- powdered component
- water
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims description 42
- 230000008569 process Effects 0.000 title claims description 35
- 238000005469 granulation Methods 0.000 title description 12
- 230000003179 granulation Effects 0.000 title description 12
- 239000008187 granular material Substances 0.000 claims description 48
- 239000000243 solution Substances 0.000 claims description 43
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 24
- 239000011230 binding agent Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 22
- 239000004115 Sodium Silicate Substances 0.000 claims description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 21
- 238000005054 agglomeration Methods 0.000 claims description 17
- 230000002776 aggregation Effects 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 15
- 239000003599 detergent Substances 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 6
- 150000002484 inorganic compounds Chemical class 0.000 claims description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 235000000346 sugar Nutrition 0.000 claims description 2
- 150000008163 sugars Chemical class 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 14
- 239000000203 mixture Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 238000011021 bench scale process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000011020 pilot scale process Methods 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 light soda ash Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 206010038731 Respiratory tract irritation Diseases 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001449 anionic compounds Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910001412 inorganic anion Inorganic materials 0.000 description 1
- 235000021539 instant coffee Nutrition 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002891 organic anions Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Saccharide Compounds (AREA)
Description
GRANULATION PROCESS The present invention relates to an improved process for granulation particularly the granulation of inorganic compounds such as light soda ash, with sodium silicate solutions , the granules so prepared and detergent compositions comprising such granules.
Many products such as instant coffee and washing-machine powder are granulated for the convenience of customers and users. Compared to powders, granules tend to have reduced dustiness, improved flow properties and less of a tendency for caking or separation from mixtures on standing or handling. Granules may also offer otner benefits such as rapid dissolution in water and facilitate accurate measurement of the correct dose. Granules also provide a constancy of component ratios in complex mixtures .
Granules can be built up in a number of ways, and a large range of equipment for granulation is commercially available. In some cases all of the granule is composed of desired product while in others, inert carriers are used to facilitate granulation or to enhance granule properties, such as solubility. Base dry granules which are porous can be used to absorc liquids to yield free flowing products that appear dry.
Production of granulated material such as surface-active agents and detergents is well known in the art and, for example, German Patent Publication No. 3910569, and Japanese Patent Publications numbered 59157198 and 59018114 describe the production of granular detergent compositions .
Granules of the prior art are often produced from components supplied as a fine dusty powder and this may lead to production of granules which suffer the disadvantage of being accompanied by oust. The presence of αust may make the αranuies messv to handle, difficult
accurately to meter and handle, contact with the dust may cause respiratory tract irritation in some people.
Several patents describe methods for preparing a granular detergent material from a dusty detergent component or powder. US patents 3,761,549 and 3,588,950 describe a process of making non-dusty detergent granules by means of gas fluidisation in a rotating drum. According to US Patent 2,730,507, non-dusting soap granules may be formed by mixing soap dust with fatty acid and an alkaline material which saponifies the acid.
It has now been found that granules which are accompanied by a reduced amount of dust can be produced by an improved granulation process . The current invention provides a process for the preparation of granules which process comprises as a first step, agglomeration of a powdered component by agitating said component and optional additives and contacting them with a binder solution and as a second step drying the resultant agglomerate to form granules wherein said first step is carried out at a temperature below 40°C and said second step is carried out at a temperature between 30°C and 60°C and at a relative humidity of less than 50%.
In a preferred aspect the invention provides a process for the preparation of a detergent granules which process comprises as a first step agglomeration of a powdered detergent component by agitating said component and optional additives and contacting the agitated powder with a binder solution and as a second step drying the resultant agglomerate to form granules wherein said first step is carried out at a temperature below 40°C and said second step is carried out at a temperature between 30°C and 60°C and at a relative humidity of less than 50%.
In further embodiments the invention also provides granules prepared accordinσ to the process of the invention.
Where used herein the term "powdered component" comprises one or more particuiate inorganic compounds of which at least 25% of the particles are smaller than 500 microns. Examples of inorganic compounds include, but are not limited to, sodium carbonate, sodium sulphate, zeolites, sodium tripolyphosphate, surfactants, alkali earth metal salts and alkali metal salts. Preferred powdered components for use in the current invention include sodium carbonate and particularly sodium carbonate in the form referred to as "light soda ash".
In a preferred embodiment of the process of the current invention the powdered component to be granulated is a dry powder comprising at least forty percent by weight of the anhydrous form of an inorganic compound which can take up water of crystallisation. In a particularly preferred embodiment the total powdered component contains essentially no free water and less than five percent of all forms of water. This water may be present in free form and/or as water of crystallisation, and/or held as "zeolitic" water. It is also particularly preferred that the powdered component is in a finely divided, free- flowing, lump free form. The properties of the granulated product formed by the process of the present invention may be adversely affected if "wet" product is used.
Furthermore, it is particularly preferred that the powdered component does not comprise any particles which are larger than the final desired granule size. A powdered component containing even small numbers of particles of size equal to or larger than the final desired granule size is undesirable as it may minimise many of the desirable benefits of the invention.
Granulation processes usually produce granules of size which is not uniform but is distributed around a target median size. Granules formed by the process of the present invention are typically of median size from 0.5 to 3 mm.
Where used herein the term "particle size" means the preferred median size as determined using standard ASTM sieve measurement techniques.
Where used herein the term "binder solution" refers to any substance capable of bonding the dusty powdered component to form and maintain agglomerates thereof and to enable them to coat the agglomerating particles. Optimally the binder solution is compatible with the powdered component plus other additives and it also possess a "setting property" either alone or by interaction with the powdered component. It is especially preferable that the binder solution comprises aqueous solutions of sugars, polyacrylate polymers or neutral sodium silicate (waterglass) or water. Small amounts of surfactant material may be added to these binder solutions in order to improve their wetting properties.
Generally, binder solutions are used at aqueous concentrations at which the liquid is viscous and "sticky". Typically, waterglasses are solutions of from about 25% to about 50% by weight, typically around 34% by weight. Properties of the granulated product may be adversely affected if too viscous a binder solution is used. This solution may be diluted if necessary to give a solution of viscosity which is preferably less than or equal to 250 cP at 20°C.
In a preferred embodiment, sodium silicate solution is the binder solution. In a particularly preferred embodiment of the current invention, the binder solution used comprises a sodium silicate solution having a silicate to alkali weight ratio (as Si0-/Na?0) between 2.0 and 3.5. Other liquids or water soluble components can be added to this solution provided that they do not increase the viscosity of the liquid, or cause chemical changes to the sodium silicate, such a precipitation of silica. Examples of unacceptable additives include un-neutralised acids, salts containing free fluoride ion and, gelling agents.
In a preferred empodiment of the present invention a sodium silicate solution having a low viscosity is used as binder solution. Without wishing to be bound by theory, it is believed that low viscosity sodium silicate binder solutions allow the silicate to more effectively penetrate the powders. If high viscosity sodium silicate binder solution is utilised, it is believed that less silicate is incorporated into the powders and granule properties such as solubility may be diminished.
Where used herein the term "additives" includes components such as granulising particles and dyes added to the powdered component.
Where used herein the term granulising particles means particles which are capable of promoting granule formulation. Such components are extensively described in Australian Patent No.615239 (26674/88) and include neutral and alkaline salts of alkali metal cations and organic or inorganic anions such as alkali metal orthophosphates and tripolyphosphates .
The aforementioned list of ingredients for use in the process of the current invention is not exhaustive and many other alternatives will be apparent to the worker skilled in the art .
In the first step of the two step granulation process of the present invention, the powder is granulated by contacting it with the binder solution, in the second step the granules formed are dried under controlled conditions. The process of the current invention may include other steps which are commonly practiced in granulation processes such as separation of undersized product and recycling of this product to the granulation process.
In a preferred empodiment of the first (or granulation) step of the process of the present invention, the binder solution is broken up into fine droplets before contacting
the powder. The binder solution can be broken up into fine droplets by any suitable method. Nozzles are commonly used in the art for reducing solutions into sprays but many other methods for forming fine droplets will be apparent to those skilled in the art.
The fine droplets of binder solution contact the powder whilst it is being agitated. Preferably the agitation is such that contact of the spray with already formed granules is minimised. Agitation of the powder can be carried out by any suitable method but pan granulators are particularly preferred.
The first step of the present invention is preferably carried out at a stable temperature of less than 40°C and preferably less than 30°C. Use of higher temperatures may reduce the amount of silicate absorbed and may reduce the solubility of the product in water.
In the second (or drying) step of the two step process of the present invention the granules are dried at low temperature and low humidity, preferably at a temperature of less than 50°C. Drying can be carried out by any suitable method but use of a vacuum dryer or fluidised bed dryer has been found to be particularly suitable. If a fluidised bed drier is used, suitably inlet air temperatures are adjusted to give a bed temperature of a maximum of 50°C (and preferably 45°C) . In practice inlet air temperatures of a maximum of 80°C, and preferably 70°C, have been found to be suitable. It is particularly preferred that drying conditions are controlled so that water evaporated from some of the drying granules does not condense other granules as this may cause caking and loss of desirable granule properties.
While it is important for the product to be relatively dry to reduce caking, it is also important that all water which is not crystallisation or chemically bound water is removed. The rate of dissolution in water of the product
granules may significantly reduced if the granules are over dried.
Preferred embodiments of the present invention will now be further described by way of the following examples.
Example 1
Laboratory Bench Scale Agglomeration of Light Soda Ash Penrice Light Soda Ash (obtained from Penrice Soda Ltd) powder was agglomerated with VITROSOL NA53 sodium silicate solution to which a compatible surfactant, ALKADET 15, was added at 0.1% to improve wetting and spraying behaviour
(ALKADET is registered trade mark of ICI Australia Limited and VITROSOL is a registered trade mark of PQ Australia Proprietary Limited) . The composition of the agglomerates are given in Tables 1(a) and 1(b) .
Table 1 (a)
VITROSOL NA53: 29.3% SiO,, 14.7. Na.,0. 56.0% H,0
Table 1 ( b )
Agglomeration was performed in a small pan granulator using a hand spray to apply the sodium silicate solution. The pan was loaded with 200g of powder and allowed to rotate so as to produce a falling curtain of powder. Sodium silicate solution 200g) warmed to 40°C was sprayed onto the falling curtain of powder at the 11 o'clock position until the particles reached desired size range.
The wet agglomerated powder was spread out on metal trays at 0.5 to 1.0 cm in depth and dried overnight in an oven at 50°C at a relative humidity of less than 50%. The properties of the granules are given in Table 2. Solubility was measured by the number or inversions at ten second intervals that are required to dissolve 5g of material in a 250 ml cylinder of tap water.
Table 2
(Water content determined py Karl-Fiscner titration)
Comparative Example I
Laboratory Bench Scale Agglomeration of Light Soda Ash
Light soda ash agglomerated in the manner of Example 1 was dried over a 48 Hour period on trays at room temperature open to the atmosphere and at a relative humidity of greater than 50%. The resulting, granules were similar in appearance to that prepared in Example 1 but contained 16.0% water and were no longer fully soluble in water.
Comparison of the products of Example 1 and Comparative Example I indicates that drying of the agglomerate at a relative humidity greater than 50% leads to a product of inferior solubility compared to the product of Example 1.
Comparative Example II
Laboratory Bench Scale Agglomeration of light Soda Ash: High Humidity Drying
Light soda ash was agglomerated in the manner of Example 1 to produce 1 kg of wet material. The wet agglomerated powder was spread out on metal trays at 0.5 to 1.0 cm depth and dried overnight at 50°C. During the drying the humidity in the oven was raised to about 50% relative humidity which appeared to cause recrystallization of the light soda ash. The granules produced had the properties in Table 3. Comparison of Tables 1 and 3 indicate that high humidity drying of Comparative Example II produces a denser and much less soluble form of granules compared with the granules of Example 1.
Table 3
Example 2
Laboratory Bench Scale Agglomeration of Light Soda Ash & Zeolite A
The technique described in Example 1 for agglomeration was applied to powdered blends containing Penrice Light soda ash and dried Toyobuilder zeolite A. The composition of the powdered detergent components used are given in Tables 4(a) and (b) . The technique was successful in forming granules and reducing the dusting character of zeolite A. The properties of the granules are given in Table 5.
Table 4 (a)
Table 4 (b)
Table 5
Example 3
Pilot Scale Agglomeration of Light Soda Ash Penrice Light Soda Ash powder was agglomerated with Vitrosol NA56 sodium silicate solution to which a compatible surfactant, Alkadet was added to improve wetting and spraying behaviour. The composition of the sodium silicate solution and the final solids composition of the granules are given in Table 6.
Agglomeration was performed in a closed vessel fitted internally with a spray arm for application of the sodium silicate solution. The closed vessel was loaded with 20 kg of light soda ash and sprayed with 15 kg of sodium silicate solution per batch. The sodium silicate solution was preheated to 40°C to lower the viscosity to the point where the spray nozzle functions efficiently. The spray was directed towards the back of the vessel where powder would most likely be exposed during the vessel's rotation. Cooling was applied to the exterior of the vessel in order to remove heat generated by the hydration of the light soda ash and from the sprayed sodium silicate solution.
The wet agglomerate was dried under vacuum that is at a relative humidity of close to zero in the closed vessel at a temperature of 50°C after an aging period of 1 to 2 hours .
The agglomerated powder required at least 4 hours drying under rotation before it was sufficiently dried. The properties of the granules formed are given in Table 7.
Table 6
(VITROSOL NA56; 32.3% SiO,, 14.3% Na,0, 53.4% H20
Table 7
** (Determined by difference in weight after drying at 290°C for 12 hours) .
Comparative Example III
Pilot Scale Agglomeration of Light Soda Ash: No
Vessel Cooling Light soda ash was agglomerated with sodium silicate solution in the manner described in Example without cooling applied to the vessel during agglomeration so that temperatures rose to greater than 40°C. The agglomeration of the light soda ash was unsatisfactory due to the high yields of oversize agglomerates and excessive adhesion of powder to the vessel walls. It is believed that the
warming of the powder above a temperature of 40°C during agglomeration resulted in the unsatisfactory product.
Example 4
Pilot Scale Agglomeration of Light Soda Ash with Fluidised Bed Drying
Light soda ash was agglomerated in the manner described in Example 3 and then dried using a laboratory bench model fluidised bed dryer with a capacity of 750g of wet agglomerate . Wet agglomerate was dried over varying intervals of time and at different temperatures. The properties of the dried agglomerates relevant to the effects of drying are given in Table 8 in which temperature °C refers to inlet air temperature of the fluidised bed drier as distinct from the bed temperature. The preferred conditions giving the shortest drying time and greatest removal of water without adverse effect on the solubility of the agglomerates are given in Example 4G. Table 8
]_ 5
Comparative Example IV
Pilot Scale Agglomeration of Light Soda Ash: Overdrying in a Fluidised Bed Dryer
The Comparative Examples CE 4H to CE 4J demonstrate the effect of using excessive drying conditions. The dried agglomerate in each case did not readily dissolve in water and left residual floes.
While the invention has been explained in relation to its preferred embodiments it is to be understood that various modifications thereof will become apparent to those skilled in the art upon reading the specification. Therefore, it is to be understood that the invention disclosed herein is intended to cover such modifications as fall within the scope of the appended claims.
Claims (14)
1. A process for the preparation of granules which process comprises as a first step agglomeration of a powdered component by agitating said powdered component and optional additives and contacting the agitated powdered component with a binder solution and as a second step, drying the resultant agglomerate to form granules wherein said first step is carried out at a temperature below 40°C and said second step is carried out at a temperature between 30°C and 60°C and at a relative humidity of less than 50%.
2. A process according to Claim 1 wherein said binder solution comprises at least one of the group comprising aqueous solutions of sugars, polyacrylate polymers, sodium silicate or water.
3. A process according to Claim 1 or 2 wherein the powdered component is a detergent .
4. A process according to Claim 1 or 2 wherein said powdered component comprises at least 40% by weight of the anhydrous form of an inorganic compound which can take up water of crystallisation.
5. A process according to Claim 1 or 2 wherein said powdered component comprises no free water and less than 5% of all forms of water.
6. A process according to Claim 1 or 2 wherein said powdered component is sodium carbonate.
7. A process according to Claim 1 wherein said binder solution comprises an aqueous solution of from 25% to 50% by weight of sodium silicate.
8. A process according to Claim 1 wherein said binder solution has a viscosity of less than or equal to 250cp at 20°C.
9. A process according to Claim 1 wherein said binder solution comprises a sodium silicate solution having an Si02/Na20 weight ratio between 2.0 and 3.5.
10. A process according to Claim 1 wherein said binder solution is broken up into fine droplets before contacting the powder as it is agitated by a pan granulator.
11. Granules prepared according to the process of any of the preceding claims.
12. Granules of median size from 0.5 to 3 mm which have been prepared according to the process of any of claims 1 to 10.
13. A process substantially as herein described with reference to the Examples .
14. Granules substantially as herein described with reference to the Examples .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU56893/94A AU666249B2 (en) | 1992-12-23 | 1993-12-17 | Granulation process |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPL655992 | 1992-12-23 | ||
AUPL6559 | 1992-12-23 | ||
PCT/AU1993/000662 WO1994014529A1 (en) | 1992-12-23 | 1993-12-17 | Granulation process |
AU56893/94A AU666249B2 (en) | 1992-12-23 | 1993-12-17 | Granulation process |
Publications (2)
Publication Number | Publication Date |
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AU5689394A AU5689394A (en) | 1994-07-19 |
AU666249B2 true AU666249B2 (en) | 1996-02-01 |
Family
ID=25631486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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AU56893/94A Ceased AU666249B2 (en) | 1992-12-23 | 1993-12-17 | Granulation process |
Country Status (1)
Country | Link |
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AU (1) | AU666249B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5454990A (en) * | 1989-05-01 | 1990-11-01 | Procter & Gamble Company, The | Agglomerated peroxyacid bleach granule and process for making same |
WO1992018603A1 (en) * | 1991-04-12 | 1992-10-29 | The Procter & Gamble Company | Agglomeration of high active pastes to form surfactant granules useful in detergent compositions |
-
1993
- 1993-12-17 AU AU56893/94A patent/AU666249B2/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5454990A (en) * | 1989-05-01 | 1990-11-01 | Procter & Gamble Company, The | Agglomerated peroxyacid bleach granule and process for making same |
WO1992018603A1 (en) * | 1991-04-12 | 1992-10-29 | The Procter & Gamble Company | Agglomeration of high active pastes to form surfactant granules useful in detergent compositions |
Also Published As
Publication number | Publication date |
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AU5689394A (en) | 1994-07-19 |
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Name of requester: NATIONAL AUSTRALIA BANK |
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