Potassium dodecylbenzene sulfonate
Time: 2012-09-28 16:26:50

Potassium dodecylbenzene sulfonate


Benzenesulfonic acid, dodecyl-, potassium salt (1:1);

Dodecyl benzenesulfonic acid potassium salt;

Potassium lauryl benzene sulfonate;

Potassium dodecylbenzenesulphonate;


Anionic Surfactant

> Sulfonate

>> Aryl Sulfonate

>>> Phenyl Sulfonate

>>>> Linear Alkylphenyl Sulfonate

Chemical Numbering System



Molecular Formula & Molecular Weight

Molecular Formula: C18H29KO3S; C18H30O3S.K

Molecular Weight: 364.58



Appearance    (1), liquid; (2), slurry; (3), solid.

Solubility    soluble in water.

Stability    stable.

Risk    Solid form: flammable material; irritation, moderate irritation to skin, eye, respiratory. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.

GHS (Rev.7) label:  

Liquid form: irritation, moderate irritation to skin, eye.

GHS (Rev.7) label: 

Ecology    may be hazardous to environment. Water body should be given special attention.

Biodegradability    biodegradable.

Characteristics    excellent cleansing, foaming, emulsifying, wetting, dispersing, solubilizing, antistatic abilities. Weak resistance to hard water, used in conjunction with chelating agent.

Note    (1), Avoid using in children cleaning products, such as shower gels, shampoo.


Currently, sulfonation reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfonates.

Generally, dodecylbenzene and sulfur trioxide react through reactor, then potassium hydroxide or potassium carbonate neutralizes, finally obtain product.

US patent 8,921,588 (Process for preparing sulfates and/or sulfonates in a micro-reaction system) presents a synthetic process. Conditions: mole ratio of sulfur trioxide and alkyl benzenes or other raw materials: 1:1; temperature: 30-60°C; reactor: falling film reactor.

Quality Standards & Test Methods

1, Physical and chemical indexes


Physical and chemical indexes

Actives, %, ≥

20.0 - 90.0

pH (25°C, 1%)

7.5 - 11.5

Test Methods

(1), Actives

GB/T 5173 Surface active agents and detergents-Determination of anionic-active matter by direct two-phase titration procedure

ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure

(2), pH

GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method

ISO 4316 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method

2, Hazardous substances indexes


Hazardous substances indexes



Heavy metals (as Pb), mg/Kg, ≤



As, mg/Kg, ≤



Test Methods

(1), Heavy metals (as Pb)

Safety and Technical Standards for Cosmetics (2015 Edition)

GB/T 30799 The test method of food detergents - Determination of heavy metals

(2), As

Safety and Technical Standards for Cosmetics (2015 Edition)

GB/T 30797 The test method of food detergents - Determination of total arsenic

3, Further explanation

(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.

(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.

Major Uses

1, Typical applications

Use as cleansing agent.

Use as emulsifying agent, dispersing agent.

2, Household detergents

Use as cleansing agent, foaming agent.

3, Industrial cleaning agents

Use as cleansing agent.

4, Emulsion polymerization

Emulsifier, particle size controlling agent in emulsion polymerization.

5, Personal care products

Use as cleansing agent, foaming agent.

6, Textile

Antistatic agent, cleansing agent in textile.

7, Pets

Use as cleansing agent, foaming agent.



Update: 20131025(1); 20170310(2);