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Ammonium hexadecyl sulfate

Time:2015-07-20 12:48:22; Reading: 7

Ammonium hexadecyl sulfate

Synonyms

Cetyl sulfate ammonium salt;

1-Hexadecanol, hydrogen sulfate, ammonium salt;

Category

Anionic Surfactant

> Sulfate

>> Chain Alcohol Sulfate

>>> Alkanol Sulfate

>>>> Linear Alkanol Sulfate

Chemical Numbering System

CASRN: 4696-47-3

EINECS: 225-162-1

Molecular Formula & Molecular Weight

Molecular Formula: C16H37NO4S; C16H34O4S.H3N

Molecular Weight: 339.53

Structure

Properties

Appearance    (1), solid.

Odor    faint characteristic odor.

Solubility    slightly soluble in water.

Stability    pH: 4~7, stable. pH < 4: hydrolyzed, reduced to alcohol. pH > 7: release ammonia. Break down when heated to high temperature for a long time. Stable in hard water.

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.10) label:  

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

Biodegradability    biodegradable.

Characteristics    excellent cleansing, foaming, emulsifying, dispersing, wetting, solubilizing abilities. Resistant to hard water. Particularly suitable for preparation of a low pH value (neutral to weakly acidic) products.

Note    (1), Avoid using in children products that can be direct prolonged contact with the skin, such as: skin care products.

Synthesis

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

Generally, cetyl alcohol and sulfur trioxide react through reactor, then ammonia water 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 alcohols 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

Solid

Actives, %, ≥

90.0

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, Hazardous substances indexes

Item

Hazardous substances indexes

Solid

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 dispersing agent, emulsifying agent.

2, Household detergents

Main ingredient or auxiliary ingredient for cleansing agent in laundry detergent and other household products, such as: wool products cleaning agent.

3, Industrial cleaning agents

Use as cleansing agent.

4, Emulsion polymerization

Emulsifier, particle size controlling agent in emulsion polymerization.

5, Pets

Main ingredient or auxiliary ingredient for cleansing agent in shampoos and other pet products.

Manufacturers

 

Update: 20161108(1);

Document

[Terminology] Dispersion system

[Terminology] Vesicle

Pandect of Ester surfactants (1): Definition

[Terminology] Van Der Waals force

[Terminology] Micellar aggregation number

Standard

Test methods of surfactants, catalog, Chinese national standards

Surfactants, catalog, Chinese national standards

Test methods of materials, catalog, Chinese national standards

Basic standards of materials, catalog, Chinese national standards

Test methods of textile auxiliaries, catalog, Chinese national standards