Sulfuric Acid, Mono-C10-16-alkyl Esters, Magnesium Salts
Time: 2012-09-07 15:53:02

Sulfuric Acid, Mono-C10-16-alkyl Esters, Magnesium Salts

Synonyms

C10-C16 Alkyl alcohol sulfuric acid magnesium salt;

Magnesium C10-16 alkyl sulfate;

Category

Anionic Surfactant

> Sulfate

>> Chain Alcohol Sulfate

>>> Alkanol Sulfate

>>>> Linear Alkanol Sulfate

Chemical Numbering System

CASRN: 68081-97-0

EINECS: 268-365-0

Molecular Formula & Molecular Weight

Molecular Formula: C20H42MgO8S2 – C32H66MgO8S2; C20H44O8S2.Mg - C32H68MgO8S2

Molecular Weight: 498.98 – 667.30

Structure

R: C10-16.

Properties

Appearance    (1), slightly yellow liquid; (2), solid powder.

Odor    faint characteristic odor.

Solubility    soluble in water.

Hygroscopicity    Solid magnesium C10-16 alkyl sulfate: hygroscopic.

Physical - chemical properties

Flash point, °C

> 93

Stability    stable in alkali, weak acid and hard water; unstable in strong acid, hydrolyzed, reduced to alcohol.

Risk    Solid form: flammable material; irritation, 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, 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, permeating, dispersing, solubilizing, antistatic abilities. Mild. Resistant to hard water. Strongly resistant to electrolyte.

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, C10-16 alkyl alcohol and sulfur trioxide react through reactor, then magnesium hydroxide 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.

US patent 6,455,488 (Process of making alkyl sulfate granulates) describes the preparation of a particulate alkyl sulfate, but does not involve the synthesis process.

US patent US 6,331,645 (Process for preparing powdery alkyl sulfates) describes the preparation of a powdery alkyl sulfate, but does not involve the synthesis process.

Quality Standards & Test Methods

1, Physical and chemical indexes

Item

Physical and chemical indexes

Liquid

Actives, %, ≥

25-30

Unsulfated materials, %, ≤

2.5

MgSO4, %, ≤

0.75

MgCl2, %, ≤

0.3

pH (25°C, 10% solution)

6.5-7.5

Color, Gardner, ≤

2

Density, g/mL, approx.

1.02

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), Unsulfated materials

GB/T 11989 Anionic surface active agents - Determination of soluble matter content in light petroleum

ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis

(3), MgSO4

GB/T 15963 Sodium lauryl sulfate, magnesium sulfate calculated.

ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis

(4), MgCl2

GB/T 15963 Sodium lauryl sulfate, magnesium chloride calculated.

ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis

(5), 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

(6), Color (Gardner)

GB/T 22295 Standard test method for color of transparent liquids (Gardner Color Scale)

ISO 4630 Clear liquids -- Estimation of colour by the Gardner colour scale

(7), Density

GB/T 4472 Determination of density and relative density for chemical products

ISO 758 Liquid chemical products for industrial use -- Determination of density at 20 degrees C

2, Hazardous substances indexes

Item

Hazardous substances indexes

Liquid

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.

(b), Generally, magnesium C10-16 alkyl sulfate and magnesium lauryl sulfate replace to use each other.

Major Uses

1, Typical applications

Use as foaming agent.

Use as cleansing agent.

Use as emulsifying agent, dispersing agent.

2, Personal care products

Cleansing agent, foaming agent in personal care products.

For example, main ingredient or auxiliary ingredient for cleansing agent, foaming agent in shampoo, hand sanitizer, bubble bath, bath soap and other products.

3, Household detergents

Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in dishwasher cleaning agent, carpet cleaning agent and other household products.

4, Industrial cleaning agents

Main ingredient or auxiliary ingredient for cleansing agent, foaming agent.

5, Pets

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

6, Emulsion polymerization

Emulsifier, particle size controlling agent in emulsion polymerization. For example, polyvinyl chloride emulsion polymerization.

7, Textile, leather

Use as emulsifier, foaming agent, cleansing agent, wetting agent, antistatic agent, solubilizing agent.

8, Disinfectant

Use as foaming agent, retention agent.

Manufacturers

 

Update: 20131018(1); 20160728(2);