Sulfuric Acid, Mono-C10-16-alkyl Esters, Triethanolamine Salts
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(4), Do not use in nitrosating environment. Reaction of triethanolamine and nitrous acid can not produce nitrosamines, however, reaction of contained secondary amine of triethanolamine and nitrous acid can produce nitrosamines. Nitrosamine is a carcinogen.
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 triethanolamine 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
Liquid
Actives, %, ≥
38-42
Unsulfated materials, %, ≤
1.0
Triethanolamine hydrochloride, %, ≤
0.5
Triethanolamine sulfate, %, ≤
0.5
pH (25°C, 10% solution)
6.5-7.5
Color*, Gardner, ≤
2
Color*, %T at 410 nm, ≥
92
Density, g/mL, approx.
1.04
*: Choose one of two.
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), Triethanolamine hydrochloride
GB/T 15963 Sodium lauryl sulfate, triethanolamine hydrochloride calculated.
ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis
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