Sodium C11-15 alkyl sulfate
time:2013-06-02 05:04:02,count:0
Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
Generally, C11-15 alkyl alcohol and sulfur trioxide react through reactor, then sodium 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
Powder
Granule
Liquid
Actives, %, ≥
90
88
27-30
Soluble materials in petroleum ether, %, ≤
1.5-3.5
1.5-3.5
1.5
Inorganic salts (Na2SO4+NaCl), %, ≤
5.5
5.5
2.0
pH (25°C, 1% solution)
7.5-10.5
7.5-10.5
7.5-10.5
Whiteness (WG), ≥
75
/
/
Color (5% solution), Klett, ≤
/
30
30
Moisture, %, ≤
3.0
5.0
/
Density, g/mL, approx
0.48
0.48
1.03
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), Soluble materials in petroleum ether
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), Inorganic salts
GB/T 15963 Sodium lauryl sulfate
ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis
(4), 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
(5), Whiteness (WG)
GB/T 13173 Surface active agents - Detergents - Testing methods
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