Branched Dodecylbenzene Sulfonate Sodium Salt
Time: 2012-09-28 16:24:16

Branched Dodecylbenzene Sulfonate Sodium Salt

Synonyms

Sodium branched dodecylbenzene sulfonate;

Branched dodecyl benzene sulfonic acid sodium salt;

Category

Anionic Surfactant

> Sulfonate

>> Aryl Sulfonate

>>> Phenyl Sulfonate

>>>> Branched Alkylphenyl Sulfonate

Chemical Numbering System

CASRNN/A

EINECSN/A

Molecular Formula & Molecular Weight

Molecular Formula: C18H29NaO3S; C18H30O3S.Na

Molecular Weight: 348.48

Structure

R: C12-branched.

Properties

Appearance    (1), liquid; (2), slurry; (3), white to slightly yellow powder.

Solubility    soluble in water.

Hygroscopicity    highly hygroscopic agglomerate. Not easy to restore into powder, after the agglomeration.

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    hardly biodegradable.

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

Note    (1), Hardly biodegradable. Avoid to use if possible.

Synthesis

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

Generally, branched dodecylbenzene and sulfur trioxide react through reactor, then sodium hydroxide or sodium 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

Item

Physical and chemical indexes

Appearance

Actives, %

pH (25°C, 1%)

20 type

pale transparent liquid; or solid

20±2

7.5 - 11.0

30 type

liquid; or solid

30±2

7.5 - 11.0

40 type

liquid; or solid

40±2

7.5 - 11.0

50 type

slurry; or solid

50±2

7.5 - 11.0

60 type

solid

60±2

7.5 - 11.0

70 type

solid

70±2

7.5 - 11.0

80 type

solid

80±2

7.5 - 11.0

90 type

solid

90±2

7.5 - 11.0

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

Item

Hazardous substances indexes

Heavy metals (as Pb), mg/Kg, ≤

20

As, mg/Kg, ≤

3

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.

Major Uses

1, Typical applications

Use as cleansing agent.

Use as emulsifying agent, dispersing agent.

2, Emulsion polymerization

Emulsifier, particle size controlling agent in emulsion polymerization.

Manufacturers

 

Update: 20131025(1); 20170324(2);