Salt Removal of High-Viscosity Ampho-Surfactant Using Nanofiltration Membrane

The effects of operating pressure,feed concentration of ampho-alkyl dimethyl betaine(BS-12),flow,concentration process on removal efficiency of sodium chloride and concentration efficiency of BS-12 using nanofiltration membrane were investigated.The experimental results show that BS-12 feed(solution) might be concentrated by nanofiltration,as surfactant BS-12 retention is more than 95% and(removal) ratio of sodium chloride is over 90% under the condition of BS-12 concentration 144 g/L,sodium chloride concentration 39.2 g/L,operation pressure 2.5 MPa and feed flow 583 L/h.Therefore,it might purify BS-12 product and has the practical value for production of BS-12 containing less than 1% sodium chloride.