Anhui Eapearl Chemical | Sodium Alpha-Olefin Sulfonate (AOS) Anionic Surfactant Series Dedicated to Detergent Applications

I. Standard Chemical Dossier of Product

1. Basic Identification Information

Standard Chinese Name: Sodium Alpha-Olefin Sulfonate

Common Abbreviation: AOS

Full English Name: Sodium Alpha-Olefin Sulfonate

CAS No.: 68439-57-6

Applicable National Standard: GB/T 20200-2022 《Sodium Alpha-Olefin Sulfonate》

Mixed Active Components of Molecule:

1.Sodium alkenyl sulfonate RCH=CHSO3Na（ Delivers low-temperature penetration and foaming performance）

2.Sodium hydroxyalkyl sulfonate RCH(OH)CH2SO3Na（ Provides stable lime soap dispersibility）

R： refers to linear saturated / unsaturated olefin carbon chain of C14~C16.

Two mainstream standardized commercial grades:

1. AOS-92 Powder: Uniform white to pale yellow powder at 25℃, packed in 25kg plastic-lined woven bags

2. AOS-35 Liquid: Pale yellow transparent viscous aqueous solution at 25℃, packed in 200kg plastic drums

 

2. National Standard & Premium-Grade Internal Control Physicochemical Indicators

Unified Test Conditions: 25℃, relative humidity 50%; test methods comply with supporting specifications of GB/T 20200

Test Item	Premium Grade Standard of GB/T 20200-2022	Premium Internal Control Standard of Anhui Eapearl	Standardized Test Method
Active Matter Content	AOS92 ≥91%; AOS35: 34~36%	AOS92: 92~93%; AOS35: 34.5~35.5%	Two-Phase Potentiometric Titration
Inorganic Sodium Sulfate Na2SO4	≤6.0 %	≤5.0 %	Ion Chromatography Quantitative Analysis
Unsulfonated Free Olefin	≤3.0 %	≤2.0 %	Neutral Oil Extraction Gravimetric Method
Platinum-Cobalt Color (Hazen) of 5% Aqueous Solution	≤120	≤60	GB/T 3143 Platinum-Cobalt Spectrophotometry
pH Value of 1% Aqueous Solution	7.0~9.0	7.5~8.5	Potentiometric Titration
Lime Soap Dispersing Power	≥120 mg\(CaCO3)/g	≥150 mg\(CaCO3)/g	Modified Schoenfeld Method per GB/T 7463
28-Day Biodegradability (OECD 301B)	≥90%	≥98%	Closed Bottle \(CO2) Evolution Test
Foam Height in 0.25% Hard Water (500ppm CaCO3)	≥140mm	≥160mm	Ross-Miles Foam Tester at 25℃

II. Molecular Interfacial Chemical Mechanism & Performance Differentiation between AOS and LABSA

2.1 Core Interfacial Functional Principle of AOS

AOS is a benzene-free linear olefin composite anionic surfactant without aromatic rings in molecular structure. Two active components work synergistically to realize comprehensive detergent performance:

1.Dissociated hydrophilic sulfonic acid groups drastically reduce static and dynamic surface tension of aqueous systems, with critical micelle concentration (CMC) as low as 0.4~0.6 mmol/L. It can rapidly penetrate fabric gaps at low temperature to strip oily and protein contaminants.

2.Linear long-chain sulfonate radicals form water-soluble coordination complexes with Ca2+ and Mg2+ in water to suppress insoluble lime soap precipitation, tolerating high-hardness water up to 500mg/L. In contrast, LABSA (Linear Alkylbenzene Sulfonic Acid) with benzene rings tends to precipitate calcium alkylbenzene sulfonate and cause fabric whitening.

3.Intramolecular carbon-carbon double bonds enhance low-temperature emulsification and penetration capacity, delivering significantly higher removal efficiency of animal protein and sebum stains under ambient temperature of 10~25℃.

3.Benzene-free molecular structure avoids passivation of protease activity, compatible with functional detergent formulations containing biological enzymes.

4.Linear olefin chain without branches or aromatic rings achieves 28-day OECD 301B biodegradability ≥98%. Phosphorus-free molecular backbone fully complies with global phosphorus-restriction regulations for detergents.

2.2 Performance Comparison & Binary Compounding Synergy Table of AOS and LABSA

Performance Index	AOS Sodium Alpha-Olefin Sulfonate	Neutralized LAS (LABSA Sodium Salt)	Chemical Synergy Logic of Binary Compounding
Molecular Structure	Benzene-free linear olefin composite sulfonate	Benzene-containing alkyl sulfonate	LABSA removes mineral and heavy particulate soil; AOS makes up deficiencies in hard water resistance, low-temperature detergency and enzyme compatibility
Tolerable Water Hardness	Max. 500mg/L (CaCO3)	Prone to lime soap precipitation below 150mg/L	AOS chelates calcium and magnesium ions to eliminate fabric whitening during washing
Protein Stain Removal at 15℃	98% removal rate	Only 82% removal rate	Compounded system achieves greatly improved cold-water detergency
Protease Compatibility	Compatible without enzyme deactivation	Benzene ring inhibits protease activity easily	Preferred compounding combination for phosphorus-free functional laundry liquids
28-Day Biodegradability	≥98%	≥90%	Elevates overall environmental grade of finished formulations
Phosphorus Control Attribute	Phosphorus-free molecule, compliant with EC 648/2004	Phosphorus-free molecule, weak lime soap dispersibility	Standard system for phosphorus-free laundry powder in northern hard-water regions
Quantified Compounding Effect	—	—	Adding 4%~8% AOS into basic LABSA formulations lifts comprehensive detergency by approximately 30% under equal total surfactant dosage without substantial cost increment

III. Standardized Application Scenarios & Formulation Process Specifications

3.1 Civil Phosphorus-Free Detergent Products (Core Application Field)

1.Recommended compounding system for phosphorus-free laundry powder & soap powder: LAS 12~16% + AOS 4~8%. 98% of protein and sebum stains can be removed within 15 minutes at ambient temperature; no soap scum deposition or fabric whitening after washing with high-hardness underground water.

2.Phosphorus-free liquid laundry detergent & intimate apparel cleaner: Dosed alone at 5~10%, or compounded with AES. Suitable for high-hardness water sources in northern China, delivering long-lasting foam and no ash residue after cold-water washing.

3.Low-irritation compounding formula for phosphorus-free dishwashing & fruit/vegetable cleaners; compatible with food-grade additives with no slippery residue after rinsing.

3.2 Personal Care Products

Applicable to weakly neutral systems (pH 7~9) with dosage of 3~6%. Used in shampoo and body wash to alleviate dry and tight skin sensation induced by pure LABSA, generating fine and durable foam.

3.3 Auxiliary Industrial Cleaning Applications

1.Low-temperature textile scouring agent & wool washing agent: Protect fibers from embrittlement and remove weaving sizing agents.

2.Ambient-temperature metal degreaser: Compounded with LABSA to strip stamping oil and antirust oil without heating.

3.Recirculating deinking cleaner for papermaking industry.

3.4 Agrochemical Emulsifying Auxiliaries

Special emulsifying component for phosphorus-free pesticide emulsifiable concentrates and suspension concentrates, improving rain wash resistance of pesticide liquid and preventing delamination during storage.

Key Standard Production Process Control Points

1.Pre-mixing temperature for AOS powder feeding shall not exceed 50℃; high temperature triggers olefin oxidation, leading to deepened product color and attenuated foaming performance.

2.Stable formulation pH range: 7.0~9.0. Carbon-carbon double bonds are prone to oxidative deterioration under strongly acidic conditions (pH＜6), causing irreversible decline in foaming and lime soap dispersing performance.

3.Liquid AOS can be directly compounded with neutralized LAS aqueous solution without extra neutralization procedures.

4.Replace partial LABSA with AOS in enzyme-containing formulations to avoid loss of enzyme activity.

IV. Full-Spectrum Supply Advantages of AOS from Anhui Eapearl Chemical

1.Spot stock of two grades for solid & liquid detergent production lines Permanent inventory of high-activity AOS-92 powder and AOS-35 liquid. Relying on Tongling central warehouse linked with Nanjing, Shanghai, Hefei, Zibo and other regional warehouses, fast allocation for full-truck and LTL shipments nationwide with near-stock delivery to northern hard-water regions. Exhibited as core detergent raw material at the 2026 IES Industry Exhibition.

2.One-stop supporting supply of full-range detergent surfactants Simultaneously supply LABSA linear alkylbenzene sulfonic acid and 70% AES. Customers can source full set of anionic raw materials for phosphorus-free laundry powder and liquid detergent from one supplier, cutting costs of multi-supplier inspection, warehousing and communication.

3.Complete domestic & overseas export compliance documents Chinese-English bilingual COA test reports and 16-section GHS standard MSDS are provided per batch. Products comply with GB/T 20200 and EU Regulation EC 648/2004 for phosphorus-free detergents, complete REACH pre-registration, and attach OECD biodegradability test reports to meet import audits of nearly 200 countries including SIRIM (Southeast Asia), BCA (Singapore), EU and North America customs.

4.Professional technical support for detergent formulations Engineers provide basic phosphorus-free LABSA+AOS compounding formulas, optimization schemes for northern high-hard-water systems and low-temperature washing process adjustment, solving common formulation defects such as fabric whitening, insufficient foam and enzyme deactivation.

5.Diversified standardized packaging

AOS92 Powder: 25kg plastic-lined woven bags

· AOS35 Liquid: 200kg plastic drums & 1000L IBC tote tanks Bulk tank truck delivery available for large-volume orders; ten-thousand-ton permanent stock ensures uninterrupted supply.

V. Specifications for Warehousing, Operation & Environmental Hazardous Waste Management

1.Storage environment: 15~35℃, relative humidity ≤60%. Seal powder products for moisture and light protection; tightly cap liquid drums. Mixed storage with concentrated strong acid and strong oxidants is prohibited to avoid olefin oxidation, discoloration and performance failure.

2.Operation protection: Wear nitrile rubber gloves and safety goggles throughout handling to prevent prolonged direct contact of stock solution with skin and eyes.

3.Waste detergent wastewater containing AOS is classified as HW09 oil-water separation industrial hazardous waste, which shall be centrally disposed of by qualified institutions. Direct discharge into municipal sewage pipelines is strictly forbidden.

VI. Conclusion

Sodium Alpha-Olefin Sulfonate (AOS) is a core phosphorus-free anionic surfactant with excellent hard water resistance for detergent systems. Free of aromatic benzene rings in molecular structure, it outperforms traditional LABSA in low-temperature detergency, lime soap dispersibility, biodegradability and protease compatibility, serving as an indispensable raw material for detergent formulations applicable to northern high-hard-water regions and global phosphorus-restriction regulations. Anhui Eapearl Chemical supplies a full portfolio of detergent anionic surfactants including AOS, LABSA and AES in powder and liquid grades. We provide complete national standard test reports, foreign trade compliance certificates and formulation debugging technical support, maintaining stable long-term supply to daily chemical manufacturers, industrial cleaning enterprises and overseas purchasers with sample testing available upon request.

 

Corporate Information

Anhui Eapearl Chemical Co., Ltd. Shanghai Eapearl Industrial Co., Ltd. Overseas Subsidiary: PT Indonesia Eapearl Chemical

Website: epchems.com Contact: +86-18656201888 (Whatsapp / Wechat) E-Mail: sales@epchems.com

Addresses

Anhui Headquarters No.518, Tongguanshu Valley, Tongguan District, Tongling City, Anhui Province, P.R.China

Shanghai Warehouse & Office No.918 Zhenchen Road, Baoshan Urban Industrial Park, Baoshan District, Shanghai, P.R.China

Indonesian Overseas Subsidiary Unit L9-02, 9th Floor, One Belpark Office Tower, Jalan RS. Fatmawati No.1, Pondok Labu, Cilandak, South Jakarta Administrative City, Republic of Indonesia

 

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