Polyelectrolytes have a high hydrophilicity and can be used in pervaporation(PV) dehydration of alcohol. Chitosan(CS) used as polycation polysaccharide and carboxymethyl cellulose(CMC) used as polyanion polysaccharide...Polyelectrolytes have a high hydrophilicity and can be used in pervaporation(PV) dehydration of alcohol. Chitosan(CS) used as polycation polysaccharide and carboxymethyl cellulose(CMC) used as polyanion polysaccharide were chosen as PV membrane materials. CS membrane cross linked with oxalic acid or citric acid and CS CMC polyelectrolyte membrane were prepared. The results showed that the polyelectrolyte membranes had an excellent PV performance for alcohol dehydration. For example, when the separation factor gone up to 2 300, the total flux of CS CMC polyelectrolyte membrane was above 800 g/(m 2·h) in 95% EtOH and at 72 ℃. The nature and content of crosslinking agents affected the separation properties of cross linked CS membrane. The total flux of the cross linked CS membrane increased with operating temperature increasing and corresponded to the Arrhenius equation.展开更多
文摘Polyelectrolytes have a high hydrophilicity and can be used in pervaporation(PV) dehydration of alcohol. Chitosan(CS) used as polycation polysaccharide and carboxymethyl cellulose(CMC) used as polyanion polysaccharide were chosen as PV membrane materials. CS membrane cross linked with oxalic acid or citric acid and CS CMC polyelectrolyte membrane were prepared. The results showed that the polyelectrolyte membranes had an excellent PV performance for alcohol dehydration. For example, when the separation factor gone up to 2 300, the total flux of CS CMC polyelectrolyte membrane was above 800 g/(m 2·h) in 95% EtOH and at 72 ℃. The nature and content of crosslinking agents affected the separation properties of cross linked CS membrane. The total flux of the cross linked CS membrane increased with operating temperature increasing and corresponded to the Arrhenius equation.
