W／O／W乳液的渗透溶胀与夹带溶胀

研究了W/O/W乳液的溶胀,实验结果表明,渗透溶胀随内外相溶液间的渗透压差、表面活性剂及载体浓度的增大而增加,但随膜粘度的增加而降低,渗透压差较高时,水渗透的影响大于夹带的影响;膜相中含氧化合物对溶胀的影响大于含氮化合物,采用Span 80作乳化剂时,比采用E 644渗透溶胀约高6倍,夹带溶胀也较高;重复聚结再分散使夹带溶胀急剧增加,因而多级混合澄清槽对液膜操作似不适用。

Permeation and Entrainment Swelling in W/O/W Emulsions

The permeation and entrainment swelling in W/O/W emulsions were studied in the batch stirrers experimentally. The results show that the permeation swelling increases with increasing the osmotic pressure difference between the internal and the external phases as well as the concentration of the surfactants and the carriers in the membranes, but decreases with increasing the membrane viscosity. When the osmotic pressure difference is higher, the effect of the water permeation on swelling is larger than that of the entrainment. The effect of the oxygen-containing compounds in the membranes on swelling is larger than that of the nitrogen-containing compounds. When span80 was used as the surfactant, the permeation swelling was 6 times higher than when E644 was used, and the entrainment swelling was also higher. Repeated of coalescence and redispersion can promote the swelling caused by the entrainment. From these results, it is concluded that the multistage mixer-settler seems unsuitable to the liquid membrane, operations.