利用SPG膜制备O/W型乳液实验研究

Experimental study on the preparation of O/W emulsions by SPG membrane emulsification

利用孔径为0．6μm的SPG（Shirasu Porous Glass）多孔微滤膜，以异辛烷为分散相、pH=7的磷酸盐缓冲水溶液为连续相、以SDS（十二烷基硫酸钠）和PVA（聚乙烯醇）分别为水相乳化剂和稳定剂，制备了。倒型乳液，研究了操作条件对乳液性能包括液滴大小及分布的影响关系．当跨膜压差在0．12～0．16MPa时，连续相流速分布在0．20～0．40m／s时，乳化剂浓度在其临界胶束浓度（CMC）之上时，乳液的单分散性较好．由于乳液具有良好的稳定性和单分散性．可用于多相界面酶催化反应，

Membrane emulsification experiments were performed using a 0.6μm pore size SPG membrane, with isooctane as dispersion phase and phosphate buffer solutions（pH = 7） as continuous phase. Emulsifiers included SDS（sodium dodecyl sulfate） and Tween-20, and PVA（ polyvinyl alcohol） was used as stabilizer. The effects of operating parameters on the property of emulsion were studied. The O/W emulsion with good property was obtained with emulsification pressure among 0.12 - 0.16 MPa, a velocity of continuous phase among 50 80 L/h, and with emulsifier content higher than its CMC（critical micelle concentration）. The emulsion can be applied to multiphasic enzyme - catalysed reaction on O/W interface because of its good stability and mono- dispersity.