Polyethylene glycol mono-C12-14-alkyl ether sulfate sodium salt
time:2012-09-26 16:04:39,count:0
Note    (1), Products that has low content of 1,4-dioxane can be used in children cleaning products. Based on irritating judgment, usage should not exceed to 10%. In no tears formula of children shampoo, may be difficult to use as a primary surfactant.
(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 C12-14 alkyl 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
C12-14 alkyl 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
1,4-Dioxane, ppm, ≤
30
30
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