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What is Linear Alkylbenzene Sulfonic Acid (LAS)
Linear Alkylbenzene Sulfonic Acid (LAS) (CAS No. 68584-22-5), also known as LABSA, is the world's most widely produced anionic surfactant, synthesized by sulfonating linear alkylbenzene (LAB) with sulfur trioxide (SO₃) or oleum. Its linear molecular structure - an alkyl chain of C₁₀–C₁₃ attached to a benzene ring carrying a sulfonic acid group - delivers superior surface activity, detergency, emulsification, and foaming performance compared to branched-chain analogs (ABS), while being highly biodegradable (≥ 90%) and meeting the environmental standards of Europe, North America, and Asia-Pacific markets.
Specification
|
Parameter |
Standard Value |
Significance |
|
Appearance |
Pale yellow to reddish brown viscous liquid |
Free of visible impurities or sediment |
|
Active Matter Content |
96.0% – 98.0% |
Core indicator of surface activity and detergency |
|
Sulfuric Acid Content |
≤ 1.5% |
Ensures product purity; reduces equipment corrosion risk |
|
Neutralization Value |
340 – 360 mg KOH/g |
Reflects reactivity with alkaline neutralizing agents |
|
Water Content |
≤ 1.0% |
Prevents hydrolysis; ensures storage stability |
|
Color (Klett) |
≤ 35 |
Indicates purity; important for light-colored end products |
|
Biodegradability |
≥ 90% |
Complies with EU Detergent Regulation and EPA requirements |
|
Shelf Life |
12 months (sealed, cool & dry storage) |
Stable under recommended storage conditions |
Cost-Effective Raw Material: LAS is the largest-volume synthetic surfactant because of its relatively low cost and excellent performance. It helps you control production costs while maintaining high product quality.
Excellent Cleaning Performance: It provides powerful cleaning action against oil, grease, and dirt. Works effectively in both household detergents and industrial cleaning applications.
Versatile Applications: Widely used for producing detergent powders, liquid detergents, dishwashing liquids, industrial cleaners, and textile processing aids. One product serves multiple formulation needs.
Biodegradable & Environmentally Friendly: LAS is biodegradable according to OECD standards. This helps you meet environmental regulations and consumer demand for greener products.
Good Compatibility: Blends well with other surfactants like SLES and nonionics. Works synergistically to enhance overall formulation performance.
The Manufacturing Process of Linear Alkylbenzene Sulfonic Acid (LAS)
Raw Materials
The primary raw materials used in the production of LAS are linear alkylbenzene (LAB) and sulfur trioxide (SO3). LAB is derived from kerosene, which undergoes a series of chemical reactions to produce the desired linear alkyl chains.
Sulfonation
The sulfonation process is the core of LAS manufacturing. It involves the reaction of LAB with SO3. This reaction can be carried out using different methods, including.
Continuous Falling Film Sulfonation
This method is widely used due to its efficiency. In this process, LAS flows down as a thin film in a reactor where it reacts with SO3 gas. The reaction is highly exothermic, requiring efficient cooling systems to maintain the desired temperature.
Batch Sulfonation
Although less common due to lower efficiency, batch sulfonation involves reacting LAS with SO3 in a batch reactor. This method allows for better control over reaction parameters but is less suitable for large-scale production.
Neutralization
The sulfonic acid formed in the previous step is neutralized using a base, typically sodium hydroxide (NaOH), to produce the corresponding sodium salt. This step is crucial to ensure the product’s stability and effectiveness in cleaning formulations.
Purification
The final product is purified to remove any unreacted materials and by-products. This is typically done using a series of filtration and washing steps. The purified LAS is then concentrated to the desired strength, usually around 96%.
Application of Linear Alkylbenzene Sulfonic Acid
Detergent Industry: LAS is a key ingredient in the formulation of various types of detergents. It is used in laundry powders, laundry liquids, dishwashing liquids, and other household cleaning products due to its excellent cleaning properties and ability to remove tough stains.
Personal Care Products: In the personal care industry, LAS is used in the production of shampoos, hand washes, and bath gels. It acts as a surfactant that helps in the removal of dirt and oils, making it ideal for personal hygiene products.
Industrial Cleaners: LAS is used in industrial cleaners for degreasing and cleaning machinery and equipment. Its strong cleaning properties make it suitable for removing oil, grease, and other industrial soils.
Agricultural Chemicals: LAS is utilized as a component in the production of agricultural herbicides and pesticides. It helps in enhancing the effectiveness of these chemicals by ensuring better dispersion and absorption on plant surfaces.
Textile Industry: In the textile industry, LAS is used as a wetting agent. It helps in the dyeing process by ensuring uniform coloring and improving the penetration of dyes into fabrics.
Emulsion Polymerization: LAS is employed in the process of emulsion polymerization. It acts as an emulsifying agent in the production of polymers, which are used in paints, coatings, and adhesives.
Oilfield Chemicals: LAS is used in the formulation of various oilfield chemicals. It is effective in oil well drilling fluids and helps in the emulsification of oil-based drilling muds.
Pharmaceuticals: LAS is occasionally used in the pharmaceutical industry as a surfactant in the formulation of certain drug delivery systems.
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