Isopropylamine dodecylbenzene sulfonate
Time: 2012-09-28 16:28:10

Isopropylamine dodecylbenzene sulfonate


Alkyl Benzene Sulfonate, Isopropyl Amine Salt;

Benzenesulfonic acid, dodecyl-, compd. with 2-propanamine (1:1);

Dodecylbenzenesulfonic acid, compd. with 2-propanamine (1:1);

Isopropylamine dodecylbenzenesulfonate;

Isopropylamine lauryl benzene sulfonate;

Dodecylbenzenesulfonic acid, isopropylamine salt;


Anionic Surfactant

> Sulfonate

>> Aryl Sulfonate

>>> Phenyl Sulfonate

>>>> Linear Alkylphenyl Sulfonate

Chemical Numbering System



Molecular Formula & Molecular Weight

Molecular Formula: C21H39NO3S; C18H30O3S.C3H9N

Molecular Weight: 385.60



Appearance    (1), amber or yellow liquid.

Solubility    soluble in water; soluble in kerosene, xylene, acetone, methanol, mineral oil; insoluble in vegetable oil; dispersed in 5% hydrochloric acid and sulfuric acid solution.

Stability    stable.

Risk    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 abilities. As a special emulsifier, mixed with other surfactants.

Note    (1), Do not use in children products, such as: shampoos, skin care products.

(2), Avoid using in personal care products.

(3), Do not use in nitrosating environment. Reaction of isopropylamine and nitrous acid can not produce nitrosamines, however, reaction of contained secondary amine of isopropylamine and nitrous acid can produce nitrosamines. Nitrosamine is a carcinogen.


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 isopropylamine 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, %, ≥

80.0 - 90.0

pH ((25°C, 10%, 50% isopropanol solution)

3.0 - 10.5

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, emulsifying agent.

4, Personal care products

Use as cleansing agent.

*  *  *  *  *  *

Further information:

(1), In accordance with EU regulations (EC) No 1223/2009, directive 2003/83/EC, isopropylamine and its salts are included in Annex III/61.

Maximum concentration of secondary amine is 0.5% in products.

In raw materials, maximum secondary amine content is 0.5%.

Maximum nitrosamine content is 50μg/kg.

The container is nitrite-free.

5, Pigment

Use as dispersing agent.

Also used as a pigment dispersant in other industries, such as: water-based coatings, oil-based coatings.

6, Pets

Use as cleansing agent, foaming agent.



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