Casting and characterization of cellulose acetate butyrate based UF membranes

This paper describes the development of ultrafiltration (UF) membranes from cellulose acetate butyrate polymer (CAB). The casting conditions are studied with reference to changes in composition of the casting solution, total thickness, solvent evaporation period and gelation bath temperature (GBT). The membranes are characterized in terms of product permeation rates and solute separation using poly (ethylene) glycols (PEG) of different average molecular weights, molecular weight cut-off (MWCO), pore size distribution profiles and scanning electron micrographs (SEM) of either surface of the membrane samples. The separation behaviour of CAB membranes prepared for turbidity, colouring matter, hardness and uranyl ion from aqueous streams indicate the feasibility of their use in water and effluent treatment applications

Preparation, characterization and performance of polyethersulfone ultrafiltration membranes

Asymmetric ultrafiltration (UF) membranes were prepared from locally made wholly aromatic polyethersulfone (PES) polymer, similar to Vitrex type, using aprotic solvents and organic additives by phase inversion method. The effect of nature of additive, solvent, ambient humidity during membrane casting and gelling medium on membrane performance were studied. The membranes were characterized in terms of separation behaviour far polyethylene glycol-5000 solute, molecular weight cut off (MWCO) profile and direct electron microscopic observations. The performance of UF membranes for sodium sulfate, rhodamine-B dye and oligomers of starch hydrolyzate are reported as a function of pressure

Synthesis and characterization of low molecular weight cut off ultrafiltration membranes from cellulose propionate polymer

This pager describes the synthesis and characterization of low molecular weight cut-off ultrafiltration (UF) membranes from cellulose propionate (CP) polymer using dimethyl acetamide solvent. The casting conditions are studied with reference to changes in the nature of additive and additive to solvent ratio. The membranes are characterized in terms of product permeation rate, solute retention for different electrolytes, as a function of feed concentration and pressure. The retention of different dyes are also included. Molecular weight cut off profiles using polyethylene glycol solutes of different molecular weights are presented. The separation behaviour of oil-water and milk protein systems are presented in order to highlight the fouling resistance of CP membranes