SLM—See Supported liquid membrane

SLM. See hydrogen, purification, membrane, supported liquid SMART. See sulphur, minimization by ART... 

One could use the liquid inunobilized in the pores for separation of liquid mixtures as well, provided the feed liquid and the permeate (strip) liquid are immiscible with the liquid membrane in the pores (Figure 8.1.49(b)). Such membranes are called supported liquid membranes (SLMs). However, at the pore mouths, the two immiscible phases contact each other. The liquid membrane phase has some solubility, however small, in the feed/strip liquid phase. Therefore the life of the liquid membrane is limited (see Kowali and Sirkar (2003) for a brief review), and periodically it needs to be regenerated (Yang and Kocher-ginsky, 2006). The liquid membrane is most likely to have extractants used with the emulsion liquid membranes or solvent extraction in the case of chemically complexing extractants. 

According to configuration definition, three groups of hquid membranes are usually considered (see Fig. 1.1) bulk (BLM), supported or immobilized (SLM or ILM), and emulsion (ELM) liquid membrane transport. Some authors add to these definitions polymeric inclusion membranes, gel membranes, dual module hollow-fiber membranes, but, to my opinion, the first two types are the modifications of the SLM and the third is the modification of BLM. It will be discussed in detail in the respective chapters. 

SLM separation systems can be classified into several different groups, according to their preparation methods, types of membrane support and membrane liquids, module types used and their application (for details, see Chapter 1). 

---