Sodium dodecylbenzene sulfonate
time:2012-09-28 16:23:35,count:0
Sodium dodecylbenzene sulfonate
Alias
Sodium lauryl benzene sulfate
Dodecylbenzene sulfonic acid, sodium salt
Sodium dodecylbenzene sulfonate
Dodecyl benzene sulfonic acid sodium salt
Sodium dodecyl benzene sulphonic acid salt
Sodium laurylbenzene sulfonate
LAS
DBS
Category
Anionic surfactants-Sulfonate
CAS No.
25155-30-0
Molecular Formula & Molecular Weight
Molecular Formula: C18H29NaSO3
Molecular Weight: 348.48
Structural Formula
Commercially available dodecylbenzene, is mixture of isomers, alkyl group distribution mainly is between C10-13/14, average alkyl length is approx 12; due to limitation of catalyst used, n-dodecylbenzene does not exist. Therefore, structure of commercially available sodium dodecyl benzene sulfonate:
x+y=8-9.
Properties
Appearance: (1), liquid; (2), slurry; (3), white or slightly yellow powder.
Solubility: soluble in water.
Hygroscopicity: extremely hygroscopic.
Stability: stable.
Risk: irritation, moderate irritation to skin, eye. Concentration of less than 1%, will not cause skin irritation; concentration of less than 0.1%, will not cause eye irritation.
Animal toxicology[1]: rat oral LD50: 1260mg/Kg; mouse oral LD50: 1330mg/Kg.
Ecology: May be hazardous to environment. Water body should be given special attention.
Biodegradability: Biodegradable.
Characteristics: excellent cleansing, wetting, foaming, dispersing, emulsifying abilities. good compatibility. Weak resistance to hard water, used in conjunction with chelating agent.
Notes: (1), sodium dodecyl benzene sulfonate is divided into two types of hard and soft. Hard sodium dodecyl benzene sulfonate is branched alkyl benzene sulfonate, referred to as ABS. ABS can not easily be biodegradable; has serious harm to aquatic organisms, especially fish; has certain reproductive toxicity. Therefore, many countries have stopped production of ABS. Soft sodium dodecylbenzenesulfonate is linear alkylbenzene sulfonate, referred to as LAS. LAS can be biodegradable.
(2), linear chain sodium dodecylbenzene sulfonate, typically may not be substituted branched dodecylbenzene sulfonate.
(3), due to potential hazards on reproductive system of straight-chain sodium dodecylbenzene sulfonate, can be not recommended to use in food field, eg: fruit and vegetable cleaning agent, dishwasher cleaning agent.
Synthesis
 
Quality standards & test methods
item
physical and chemical indexes
appearance
Actives*, %
pH (25℃, 1%)
20 type
pale transparent liquid or solid
20±2
7.5-9.5
30 type
liquid; or solid
30±2
7.5-9.5
40 type
liquid; or solid
40±2
7.5-9.5
50 type
slurry; or solid
50±2
7.5-9.5
60 type
solid
60±2
7.5-9.5
70 type
solid
7±2
7.5-9.5
80 type
solid
80±2
7.5-9.5
90 type
solid
90±2
7.5-9.5
test methods
eye observation
 
 
*: should be marked on molecular weight.
Major Uses
Cleansing agent in household care products. eg: washing powder, laundry detergent and household hard surface detergent.
Cleansing agent in industrial cleaning.
Anti-caking agent in products that easily absorbing moisture. eg: hexamine, urea, ammonium nitrate, ammonium chloride
Emulsifying agent, dispersing agent, anti-caking agent in pesticide.
Antistatic agent, cleaning agents in textile.
Foaming agent, crude oil demulsifier in petroleum.
Emulsifying agent in emulsion polymerization. Particularly suitable for pressure-sensitive adhesive polymerization.
Manufacturers
 
References
[1]:http://toxnet.nlm.nih.gov/: 25155-30-0
[2]:Trivedi S P, Kumar M, Mishra A, etal.Impact of linear alkyl Benzene sulphonate ( LAS ) on phosphatase activity in testis of The teleostean fish, Heteropneustes fossilis ( Bloch ) ( J ) . Environ Biol, 2001, 22 ( 4): 263 – 266
Update: 20131025(1);

 

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