Polyoxyethylene alkyl phenol formaldehyde resin sodium sulfate
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(2), Contain formaldehyde.
Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
Polyoxyethylene alkyl phenol formaldehyde resin 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
Liquid
Actives, %, ≥
40.0
pH (25°C, 1% solution)
5.0 - 7.0
1,4-Dioxane, ppm, ≤
30
Test Methods
(1), Actives
 
(2), pH
GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method