| 摘要 |
<p>Provided are a mixed solvent for refining surfactants and a surfactant purification method. The mixed solvent comprises water, a first solvent and a second solvent. The first solvent is an organic solvent with a low boiling point, which is miscible with water. The second solvent is ethylene glycol. The volume percent of water is 0.5%~94%, the volume percent of the first solvent is 5%~99%, and the volume percent of the second solvent is 0.5%~35%. The purification method comprises dissolving an industrial grade surfactant in the mixed solvent, adding adjuvants to adjust pH, cooling and filtrating for removing impurities to obtain a filtrate, vaporizing and concentrating the filtrate in an evaporation crystallizer, and refluxing the solvent with a low boiling point into the evaporation crystallizer until the surfactant has been crystallized and separated out.</p> |
