Abstract
Thin film composite (TFC) polymeric hollow fiber (HF) membranes are widely used in industrial gas/vapor separations and water treatment. There are many advantages of TFC HF membranes, such as low energy requirements, simplicity of operation, and high specificity. In the present article, a review is made on the progress that has been achieved during the past 15 years in the preparation of the HF substrate and the preparation/modification of the thin selective layer. The review also includes their applications in water treatment, dehydration of alcohols via pervaporation, and gas/vapor separation.
Highlights
Hollow fiber membranes (HFMs) are artificial membranes, with a semi-permeable barrier in the form of hollow fiber, were developed in the 1960s for reverse osmosis (RO) applications
Four different amines (m-phenylenediamine (MPD) and three different molecular weight hyper-branched polyethyleneimine (HPEI)) were used for Interfacial polymerization polymerization (IP) for the formation of the thin film on the outer surface of a hollow fiber. These membranes were used for the separation of an isopropyl alcohol (IPA)/water mixture via pervaporation, and it was reported that the thin film composite (TFC) membrane fabricated from hyper branched polyethyleneimine (HPEI) with a molecular weight of 2 kg mol−1 showed the best separation factor of 624 with a flux of 1282 g m−2 h−1
Henis and Tripodi suggested that the separation properties of coated composite membranes are governed by the porous support material rather than by the coating material, and presented a resistance model to explain the behavior of composite gas separation membranes
Summary
Hollow fiber membranes (HFMs) are artificial membranes, with a semi-permeable barrier in the form of hollow fiber, were developed in the 1960s for reverse osmosis (RO) applications. Hollow fiber membranes are highly efficient and very popular due to their low energy requirements, simplicity of operation, and high specificity qualities. A highly porous substrate coated with a dense film of a different polymer is usually called a thin film composite (TFC) membrane. For RO, a thin film composite (TFC) membrane is a multi-layer membrane in which an ultrathin semipermeable membrane layer is deposited on a finely microporous support structure [3]. Among several methods devised for the preparation of composite membranes, interfacial polymerization is used most often. Cadotte [4] fabricated for the first time the selective polyamide film by interfacial polymerization of m-phenylene diamine (MPD) and trimesoyl chloride (TMC), which is still used widely
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