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.6) label:  
Liquid form: irritation, moderate irritation to skin, eye.
GHS (Rev.6) 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);