Sodium Dodecylpoly(oxyethylene) Sulfate
time:2012-09-26 16:03:55,count:0
(2), 1,4-dioxane generated during preparation: probable carcinogen. However, can be acceptable when concentration of 1,4-dioxane is less than 30ppm or less.
Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
1. Synthesis of polyether
Obtain by polymerization reaction of lauryl alcohol and ethylene oxide.
For further information, see:
US patent 4,223,163 Process for making ethoxylated fatty alcohols with narrow polyethoxy chain distribution; US patent 4,967,017 Alcohol ethoxylates of reduced EO content or residual PO content; US patent 5,069,817 Process for making polyoxyethylene surfactants with desirable low temperature behavior, etc.
2. Synthesis of sulfate
Lauryl alcohol polyoxyethylene ether 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 polyethers 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
High-enriched type
Low-enriched type
Actives, %, ≥
55.0 - 72.0
25.0
Unsulfated materials, %, ≤
2.50
0.45 - 1.0
Ethanol insoluble materials, %, ≤
0.25
/
NaCl, %, ≤
0.5
0.03 - 0.8
Na2SO4, %, ≤
1.0
0.16 - 0.8
pH (25°C, 10% solution)
6.5 - 9.5
6.5 - 9.5
Density, g/mL, approx
1.04
1.03
Color*, %T at 420 nm, ≥
90
80 / 92.0 - 97.0
Color*, Klett, 5% solution, ≤
30
/
1,4-Dioxane, ppm, ≤
30
30
*: Choose one of the two.
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