Linear Alkyl Benzene Sulfonic Acid

Product Details

CasNo： 27176-87-0

MF： C18H30O3S

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information​

1.1 Chemical Formula​

Alkylbenzene sulfonic acid generally has the formula R - C₆H₄ - SO₃H, where R represents an alkyl group. For example, in dodecylbenzene sulfonic acid (a common type), the formula is C₁₈H₃₀O₃S as the alkyl group R is a dodecyl group (C₁₂H₂₅).​

1.2 CAS Number​

The CAS number for alkylbenzene sulfonic acid is 27176 - 87 - 0.​

1.3 Appearance​

Pure alkylbenzene sulfonic acid exists as colorless acicular or leaf - like crystals. However, industrially produced alkylbenzene sulfonic acid often appears as a brown or brown - red viscous liquid due to the presence of impurities and by - products from the sulfonation reaction.​

2. Physical and Chemical Properties​

2.1 Melting Point​

The melting point of the anhydrous form is around 50 - 51 °C, while the form with 1.5 molecules of crystal water has a melting point of 43 - 44 °C. For dodecylbenzene sulfonic acid, the melting point is approximately 10 °C.​

2.2 Boiling Point​

The boiling point is relatively high. For instance, the boiling point of dodecylbenzene sulfonic acid is about 82 °C.​

2.3 Solubility​

It is highly soluble in water and ethanol. It is insoluble in diethyl ether and carbon disulfide and slightly soluble in benzene. It can dissolve up to 300,000 mg/L in water at 20 °C.​

2.4 Density​

The density is approximately 1.06 g/mL at 20 °C.​

2.5 Other Properties​

Alkylbenzene sulfonic acid belongs to the category of strong acids. It has a high viscosity and is non - volatile. It is insoluble in common organic solvents but has a strong water - absorbing property. When a small amount of water is added, it will agglomerate, and further addition of water will lead to complete dissolution.​

3. Quality Standards​

3.1 Active Substance Content​

Typically, it is required to be ≥96%.​

3.2 Free Oil Content​

Should be ≤2.0%.​

3.3 Inorganic Acid Content​

Must be ≤1.5%.​

3.4 Color​

Measured by the Klett value, for a 5% aqueous solution, it is usually required to be ≤50.​

4. Production Method​

The combustion - sulfur method is commonly used. In this process, SO₃ reacts with linear alkylbenzene through a sulfonation reaction to produce alkylbenzene sulfonic acid.​

5. Applications​

5.1 Surfactant in Cleaning Products​

It is a crucial raw material for manufacturing synthetic detergents. It is widely used in the production of synthetic washing powder and various synthetic liquid detergents. It can also be found in personal care products such as shampoo, shower gel, hand - wash, and dish - wash detergents, where it provides excellent detergency, foaming, and emulsifying properties to effectively remove dirt and grease.​

5.2 Pesticide Emulsifier​

Alkylbenzene sulfonic acid can be used as a pesticide emulsifier. It helps in evenly dispersing pesticides in water, improving their efficacy and stability when applied.​

5.3 Curing Catalyst​

It serves as a curing catalyst for amino baking varnishes, promoting the cross - linking and hardening of the coating film, thus improving the performance and durability of the paint.​

6. Packaging and Storage​

6.1 Packaging​

Generally, it is packaged in plastic drums. A common packaging specification is 200 Kg/drum.​

6.2 Storage​

It should be stored in a well - ventilated area, protected from sunlight and moisture. The storage period is typically around 30 days. Prolonged storage may cause the product to darken in color, which can affect the quality of downstream products. During storage and transportation, measures should be taken to prevent the entry of impurities and moisture. Transportation can be carried out by tank trucks for short - distance transportation or in standard large drums for long - distance transportation.​