Overview
Methyl Ester Sulfonate (MES) is a bio-based surfactant synthesized through the sulfonation of fatty acid methyl esters derived from palm or coconut oil. Developed as an alternative to linear alkylbenzene sulfonates (LAS), MES offers superior environmental compatibility while maintaining strong cleaning performance. Its production involves a two-step process: esterification of fatty acids followed by sulfonation with gaseous SO3. As a leading green surfactant in the detergent industry, MES has gained significant market share in regions with stringent environmental regulations. The compound's molecular structure combines a hydrophilic sulfonate group with a lipophilic fatty acid chain, enabling effective removal of both polar and non-polar soils.
Physical and Chemical Properties
MES typically appears as a viscous paste or free-flowing powder with mild fatty odor. Its solubility in water increases with temperature, forming stable micellar solutions above its critical micelle concentration (CMC). The surfactant demonstrates exceptional calcium ion stability, maintaining cleaning efficiency in water hardness up to 300 ppm CaCO3—a significant advantage over traditional sulfonates. The compound exhibits pH-dependent behavior, with optimal performance in neutral to slightly alkaline conditions (pH 7-9). Thermal stability is moderate, with decomposition beginning around 150°C. Viscosity profiles show pseudoplastic flow characteristics, making it suitable for both liquid and powdered detergent formulations.
Main Applications
In household detergents, MES serves as the primary active ingredient in eco-friendly laundry powders and liquids, offering superior stain removal on protein-based soils like blood and grass. The personal care industry utilizes MES in mild shower gels and shampoos, where its low irritation potential is valued. Industrial applications include textile processing aids and emulsion polymerization. Recent innovations employ MES in combination with enzymes for cold-water detergents, leveraging its low-temperature activity. Agricultural formulations use MES as a wetting agent for pesticides, benefiting from its rapid biodegradation in soil. The surfactant also finds niche applications in firefighting foams and oil spill dispersants due to its high flash foam stability.
Safety and Storage
MES is classified as non-hazardous under GHS standards, with LD50 values >2,000 mg/kg (oral, rat). The material safety data sheet (MSDS) recommends standard personal protective equipment (gloves, goggles) when handling concentrated forms. Prolonged skin contact may cause mild dehydration but does not typically induce sensitization. Bulk storage requires stainless steel or polyethylene containers to prevent moisture absorption. Industrial users should monitor relative humidity below 65% to prevent caking. Shelf life is typically 24 months when stored in original packaging at 15-30°C. Spills should be contained with absorbent materials and disposed of according to local wastewater regulations.
B2B Procurement Guide
Commercial MES is available in three main grades: technical (70-80% active matter), high-purity (>90%), and formulated blends with other surfactants. Buyers should verify ISO 16128 certification for natural origin claims and request batch-specific biodegradability test reports (OECD 301 standards). Key procurement considerations include fatty acid chain length distribution (C12-C18 optimal for detergents), residual methanol content (<0.5% preferred), and color stability. Major manufacturers are concentrated in Southeast Asia (Malaysia, Indonesia) and Western Europe. Container load quantities (20-25 MT) typically offer 10-15% cost savings versus bagged shipments. Sample testing should evaluate foaming characteristics and compatibility with other formulation components.
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