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Alpha Olefin Sulphonate (AOS)

CAS No.: 68439-57-6 Molecular formula: CnH2n-1SO3Na (n= 14 – 16) Common synonyms : Sodium alpha-olefin sulfonate • Sodium tetradecene sulfonate • Linear alpha-olefin • α-olefin sulfonate • Sodium a-olefin sulfonate • Sodium c14-16 olefin sulfonate

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A-olefin sulfonate is mostly derived from coconut oils. 

Alpha olefin sulfonates are typically created by processes such as ethylene oligomerization, or by the Fischer-Tropsch process of synthesis. The sulphonation process starts inside a continuous thin film reactor. High-temperature hydrolysis reacts with sultones to form a mixture of cyclic sulfonate esters and alkene sulfonic acids. This is followed by incorporating aqueous sodium hydroxide to neutralize the mix. Neutralization and hydrolysis are carried out in isopropanol instead of water in order to form Alpha olefin sulfonates in solid form.

Alpha olefin sulfonate features excellent cleaning and degreasing properties, strong wetting effect, foam booster, slight viscosity enhancer. It’s compatible with other surfactants, including amphoteric and non-ionic co-surfactants.

It’s gentle on the skin, without drying effects, which makes it ideal for making sulfate-free cleansing products. Those features, along with decent biodegradability, lead to the high popularity of Alpha olefin sulfonate as a cosmetic ingredient. In general, non-sulfate anionic surfactants are gradually becoming the prime solution for use in personal care cleansing products, particularly for scalp and hair care.

The most common AOS used in cosmetics is sodium C14-16 olefin sulfonate. This multifunctional variety can act as a detergent, emulsifier, and wetting agent. Properly formulated, it enhances viscosity, foaming properties, and the production of a stable lather.

Alpha olefin sulfonate can be added to formulas on its own, in a range of 4-30% of the final product. The concentration depends on desired properties, such as foaming and cleansing effects.

Two years under proper storage. Store in a dry, cool place, away from moisture and heat.  

Alpha olefin sulfonate is stable at an extensive pH range and suitable for use in acidic environments.

Alpha olefin sulfonate is a chemical compound composed of long-chain sulfonate salts made by the process of sulfonation of alpha-olefins. Alpha-olefin sulfonate is produced by oligomerization of ethylene, or by Fischer-Tropsch synthesis. The process is followed by purification. 

Alpha olefin sulfonate’s primary use is in washing powder, liquid detergents, and soaps. Other applications include the textile, printing, and dyeing industries as well as the petrochemical industry. Alpha olefin sulfonate is additionally used as an industrial foaming agent, wetting agent, concrete density improver, and pesticide emulsifier. 

Alpha olefin sulfonate is commonly used as a surfactant in personal care products, such as sulfate-free shampoo, liquid and bar soaps, hand sanitizers, bath lotions, bubble baths, and facial cleansers, as well as in various household products such as dishwashing liquids and vehicle wash liquids. 

Alpha olefin sulfonate is characterized by good solubility, suitable for use in liquid detergents. 



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