Spray-Dried Detergent Granules with High Anionic Surfactant Content
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Solution Overview
Problem
Current detergent manufacturing processes face challenges in producing spray-dried detergent granules with anionic detergent content above 40 wt% due to high energy consumption, poor drying rates, and handling issues, which lead to increased energy costs and environmental concerns.
Innovation Solution
A process involving the neutralization of anionic surfactant precursors with a source of alkali, followed by the addition of Na2SO4 and Na2CO3 to form a slurry with a specific molar ratio, and subsequent spray-drying to produce detergent granules with greater than 45% anionic surfactant content, utilizing a polycarboxylate polymer to enhance granule properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the anionic detergent content is increased above 40 wt%, then the washing effectiveness is improved, but the drying rate decreases and energy consumption increases
Solution Approach 1:
The invention changes the physical-chemical parameters of the slurry by controlling the water content to be 35-50 wt% and the anionic detergent content to be 40-60 wt%, optimizing the balance between detergent concentration and drying efficiency. This parameter optimization allows achieving high detergent content while maintaining acceptable drying rates.
2Quantity of substance
If the anionic detergent content is increased above 40 wt%, then the washing effectiveness is improved, but the energy consumption increases
Solution Approach 1:
The invention optimizes the energy consumption by controlling the slurry parameters (water content 35-50 wt%, anionic detergent 40-60 wt%) to reduce the drying energy requirement. The optimized composition allows lower drying temperatures and shorter drying times compared to conventional high-detergent formulations.
Solution Approach 2:
The invention converts the potential harm of high detergent content (which normally causes high energy consumption) into a benefit by optimizing the slurry composition and drying parameters, achieving high detergent content (40-60 wt%) with reduced energy consumption through controlled water content and optimized drying conditions.
3Quantity of substance
If the anionic detergent content is increased above 40 wt%, then the washing effectiveness is improved, but the handling and storage difficulty increases
Solution Approach 1:
The invention changes the physical parameters of the final product by controlling the granule size (0.5-2.0 mm) and shape through optimized spray-drying conditions. This results in free-flowing granules with low dust content that are easy to handle and store, even at high anionic detergent contents of 40-60 wt%.
4Quantity of substance
If the water content in slurry is increased to achieve high anionic detergent content, then the detergent concentration is improved, but the aeration and viscosity problems increase
Solution Approach 1:
The invention optimizes the slurry composition by controlling water content (35-50 wt%) and anionic detergent content (40-60 wt%) within specific ranges, preventing excessive aeration and viscosity. This optimized parameter range ensures the slurry remains pumpable and transportable without requiring complex handling equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process results in detergent granules with improved energy efficiency, higher anionic surfactant content, and better powder properties, including increased specific surface area and storage stability, reducing environmental impact and packaging costs.
Implementation Method 1
drying these in a counter-current spray-drying tower
Implementation Method 2
atomising slurry under high pressure to form droplets
Data Source
AI summary
There is provided a process for the production of a detergent granule comprising at least 40% by weight of an anionic surfactant and suitable for use as a granular detergent composition or a component thereof, which comprises the steps of (i) neutralising an anionic surfactant precursor with a source of alkali, (ii) adding Na2SO4 and Na2CO3 to form a slurry and (iii) spray-drying the obtained slurry to forma granule, whereby the molar ratio of Na2SO4 to Na2CO3 is in range of 1 :3.3 to less than : 1.3, and whereby the double salt Na2SO4. Na2CO3 is formed and whereby the slurry comprises a polycarboxylate polymer. There is also provided a spray-dried detergent carrier granule comprising at least 40% by weight of an anionic surfactant and suitable for use as a granular detergent composition or a component thereof, comprising (i) linear alkylbenzene sulphonate (LAS), soap and mixtures thereof, and (ii) the double salt Na2SO4. Na2CO3 obtainable by the process of the present invention. A third aspect is a detergent composition comprising such granules.