Abstract:

The transport of copper ion through a hollow fiber renewal liquid membrane was studied with LIX984N as the carrier, kerosene as the diluent and H₂SO₄ as the stripping. The experiments were conducted as functions of pressure difference, copper concentration in feed and stripping solutions, flow rate of both sides, operation mode, effective length of the hollow fibers module, etc. The results showed that the pressure difference between shell side and lumen side fluid had little influence on the mass transfer performance of the hollow fiber renewal liquid membrane process. The mass transfer flux increased with the increasing copper concentration in the feed solution. The copper concentration in the stripping solution had almost no influence on the mass transfer. The mass transfer flux increased with the increasing flow rate of feed phase on the shell side, while the flow rate of stripping phase on the lumen side had slight influence on the mass transfer. The effect of both operation modes of countercurrent and cocurrent flow on the mass transfer was slight. The average mass transfer flux per area decreased with the increasing effective length of hollow fibers.

Key words:

中空纤维更新液膜, LIX984N, 铜, 传质

摘要：

以LIX984N为载体，煤油为稀释剂，H₂SO₄为反萃剂，研究了中空纤维更新液膜过程中铜的传递行为。考察了两相压差、铜离子浓度、两相流速、操作方式以及膜丝有效长度等对传质过程的影响。结果表明：膜丝两侧的操作压差对传质过程几乎没有影响；随着料液相中溶质Cu(Ⅱ)浓度的增大传质通量增大，而反萃相中的Cu(Ⅱ)浓度对传质过程几乎没有影响；传质通量会随着壳程料液流速的增大而增大，但管程侧反萃相的流速对传质过程影响很小；逆流和并流两种操作方式对传质过程的影响可以忽略，而膜丝有效长度的增加会导致单位面积平均传质通量的下降。

关键词:

中空纤维更新液膜, LIX984N, 铜, 传质