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
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Item
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Physical and chemical indexes
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||
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68 type
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28 type
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25 type
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|
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Actives, %, ≥
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66-70
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27-29
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24-26
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Unsulfated materials, %, ≤
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4.0
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1.5
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1.5
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(NH4)2SO4, %, ≤
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2.0
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1.0
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1.0
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NH4Cl, %, ≤
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0.5
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0.3
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0.3
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pH (25°C, 10% solution)
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5.5-7.0
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5.5-7.0
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5.5-7.0
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Color Hazen (5% solution), ≤
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30
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30
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30
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Fe, mg/Kg, ≤
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5
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5
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5
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Density, g/mL, approx.
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1.0
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1.0
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1.0
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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