Hybrid membranes liquid separation

Recently developed aqueous hybrid liquid membrane (AHLM) separation process is similar to the OHLM except the liquid membrane phase is an aqueous solution as are the feed and strip solutions [70,119]. But these systems are not included in this chapter. 

Wodzki R and Nowaczyk J. Extraction and separation of propionic and acetic acid by permeation in a hybrid membrane system composed of liquid and ion-exchange polymer membranes. Solv Extr Ion Exch, 1997 15(6) 1085-1106. 

Transport and fouling phenomena in liquid phase separation with inorganic and hybrid membranes... 

Distillation is still the most common unit operation to separate liquid mixtures in chemical and petroleum industry because the treatment of large product streams and high purities with a simple process design is possible. Despite of this the separation of azeotropic mixtures into pure components requires complex distillation steps and/or the use of an entrainer. Industrial applied processes are azeotropic, extractive or pressure swing distillation (Stichlmair and Fair, 1998). Another sophisticated method for the separation of binary or multicomponent azeotropic mixtures is the hybrid membrane process, consisting of a distillation column and a membrane unit. 

Besides, gas-liquid reactions can be performed within a membrane microreactor where membrane serves for product separation and thereby limits product inhibition [100]. In this version, the fabrication and operation of new hybrid membrane microreactors for gas-liquid-solid reactions is described. The reactors consist of porous stainless steel tubes onto which carbon nanofibers (CNFs) are grown as catalyst support (Figure 9.26). CNFs have high surface area, so they can be efficiently used as a catalyst support. 

Guizard C., Rios G. Transport and fouling phenomena in liquid phase separation with inorganic and hybrid membranes. In Fundamentals of Inorganic Membrane Science and Technology, Burggraaf A.J., Cot L., eds. Amsterdam Elsevier, 1996, Chapter 12, pp. 569-618. 

We have been studying the novel process for CO2 separation named membrane/absorption hybrid method. The advantages of this process are that high gas permeance and selectivity were obtained. The concept of this process is shown in Fig. 1. Both feed gas and absorbent solution are supplied to the inside of hollow fibers. While Ae liquid flows upward inside the hollow fibers, absorbent solution absorbs CO2 selectively and it becomes a rich solution. Most of rich solution permeates the membrane to the permeate side maintained at reduced pressure, where it liberated CO2 to become a lean solution. Compared to a conventional gas absorption... 

Membrane chromatography systems include microporous or macroporous membranes that contain functional ligands attached to their inner pore structure, which act as adsorbents. In this sense, membrane chromatography is a hybrid combination of liquid chromatography and membrane filtration. Its most important potential applications include separations of biomolecules, such as proteins, polypeptides, and nucleic acids (85,86). 

---