Production and Application of Span Nonionic Surfactants
Li Kui (Liaoning Oxiran Chemical Group , Liaoyang 111003)
The properties, production and application of Span nonionic surfactants were reviewed with an emphasis on the two - step process comprising anhydride formation and esterification. In etherification, composite catalysts with antioxidation was used and in esterification, sodium hydrogen carbonate was used as catalyst. The applications of Span nonionic surfactants, especially the combination of Span nonionic surfactants with Tween surfactants with better behavior were systematically introduced.They could be used as emulsifier, dispersing agent, solubilizing agent, wetting agent, foaming agent, defoaming agent, antistatic agent and rust preventing agent and so on. They had wide use in many fields such as food industry, pharmaceutical industry, cosmetic industry, oilfield chemicals etc.