Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
Generally, C12-15 alkyl 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
|
||
68 type
|
28 type
|
25 type
|
|
Actives, %, ≥
|
66-70
|
27-29
|
24-26
|
Unsulfated materials, %, ≤
|
4.0
|
1.5
|
1.5
|
(NH4)2SO4, %, ≤
|
2.0
|
1.0
|
1.0
|
NH4Cl, %, ≤
|
0.5
|
0.3
|
0.3
|
pH (25°C, 10% solution)
|
5.5-7.0
|
5.5-7.0
|
5.5-7.0
|
Color Hazen (5% solution), ≤
|
30
|
30
|
30
|
Fe, mg/Kg, ≤
|
5
|
5
|
5
|
Density, g/mL, approx.
|
1.0
|
1.0
|
1.0
|
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), Unsulfated materials
GB/T 11989 Anionic surface active agents - Determination of soluble matter content in light petroleum