Buying bulk washing powder direct from the suppliers is considered one of the best alternatives for those who are consuming washing powder a lot or for those who are looking to resell this product in the market. In order to achieve a bulk density of over 700 g/liter after spray-drying the powder, and more preferably between 700 and 900 g/liter, the water content of the slurry should ideally range from 20 to 24% by weight. In most cases, it will be preferable to reduce the amount of water content to the absolute minimum level that is still practicable; however, the percentage at which this minimum occurs will vary depending on the other components that are included in the formulation. 
In general, it will be preferable to reduce the water content to the absolute minimum level that is still practicable. For example, the viscosity of the slurry will decrease sharply with an increase in the content of nonionic surfactant for a given level of sodium carbonate. As a result, slurries that contain higher levels of nonionic surfactant will be able to be processed at lower water contents than those that do not contain as much nonionic surfactant. Preferably, the ratio of sodium carbonate to sodium sulfate falls between 0.2:1 and 1:1, more preferably between 0.25:1 and 0.9:1. When the weight ratio was around 0.37:1, or when the mole ratio of the two salts was about 1:2, it was discovered that the slurry's viscosity was approaching its lowest point. It is preferable to create the slurry such that its viscosity, as measured at a shear rate of 50 secs-1, is less than 20 poise, and much more preferable, less than 15 poise. The slurry must include a nonionic surfactant, as was already suggested, in order for the invention's procedure to be used successfully. 
An ethoxylated primary or secondary alcohol with a carbon chain length in the hydrophobic portion of between 5 and 25, and contains between 5 and 35 moles of ethylene oxide per mole of alcohol is preferred for the nonionic surfactant. Ethoxylates of the Dobanol and Neodol (Registered Trade Mark) alcohols and the Tergitol (Registered Trade Mark) alcohols, both sold by Union Carbide Corporation and Shell Chemicals Limited, are examples of these materials. Alkyl phenol ethoxylates, for instance, are another kind of nonionic surfactant that can be used. Sodium carbonate, which typically serves as the detergency builder function needed for the product in use, must also be present in the slurry for it to be effective. However, other detergency builders may be added to the sodium carbonate as long as they don't make the slurry too viscous at the water content needed to achieve the desired high bulk density upon spray-drying. Therefore, phosphate builders like sodium tripolyphosphate, sodium pyrophosphate, and sodium orthophosphate may be used in small amounts. 
Sodium aluminosilicates, whether amorphous or crystalline, as well as organic detergency builders such sodium nitrilotriacetate, sodium citrate, and sodium carboxymethyloxysuccinate, may also be employed. Typically, less than 10% of the total weight of these non-carbonate builders will be required. In a specific weight ratio to sodium carbonate, sodium sulfate is another crucial component of the slurry. Without wishing to be restricted by theory, it is thought that sodium sulfate acts as a carbonate hydration inhibitor, promoting the growth of cubic crystals of the double salt Burkeite that pack tightly together with little water entrainment. Without an inhibitor, needle-shaped crystals can form and interlock in the slurry, entrapping water as they grow. This increases the amount of water the slurry needs and, consequently, the amount that must be evaporated during the spray-drying process. In most cases, sodium silicate will also be present in the slurries. In addition to having some detergency-building potential, this also has the potential to be a potent corrosion inhibitor when used in place of the spray-dried powder in a washing machine. In most cases, the slurry will include enough sodium silicate to provide between 5 and 15% to the final detergent powder. 
The procedure is meant to be used to create powders that mostly include nonionic surfactants, although the slurries may also contain some anionic surfactants. A few examples of common anionic surfactants include sodium alkylbenzene sulphonates, sodium alkyl sulfates, sodium alkane sulphonates, and sodium alkyl ether sulfates. It is highly suggested that their maximum concentration be limited to 2% by weight of the slurry due to the fact that the presence of these surfactants in any significant amount reduces the bulk density of the spray-dried powder. It is preferable to use compositions devoid of anionic surfactants. The slurries can also include a variety of optional additives, such as lather controllers, anti-redeposition agents like sodium carboxymethylcellulose, fabric softening agents like quaternary ammonium salts, either alone or in combination with clays, anti-ashing aids, starches, slurry stabilizers like copolymers of ethylene and maleic anhydride, and of vinyl methyl ether and maleic anhydride, typically in salt form, The spray-dried powder may be dosed with heat-sensitive ingredients in the proper proportions to create a finished powder in the last step of the process. The typical heat-sensitive substances that are added in this way include sodium perborate mono- and tetrahydrates, sodium percarbonates, and acid bleach precursors like sodium nonyl oxybenzene sulphonate, tetraacetylglycouril, and tetra acetyl ethylene diamine, as well as fragrances, enzymes, and composite adjuncts. 
The method is particularly useful when adding composite adjuncts to spray-dried powder in a dry-dosing stage since these adjuncts often have very high bulk densities and have a tendency to separate from lighter powders. Examples of composite additives include antifoam granules, like those made of starch with a coating of liquid and waxy hydrocarbons, composite colored speckles made of spray-dried base powder that has been granulated with a colored binder solution, additives containing calcium carbonate seed crystals like high surface area calcite (80-90 m2 g-1), and specialized bleach additives. Do not hesitate to get in touch with us if you are interested in purchasing any sort of detergent you can think of in the amount you want and the pack size you like. Our experts are standing by to guide you in selecting the appropriate detergent for your needs, taking into account the priorities you have.
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