STUDY ON EXTRACTION OF BROMINE FROM SEAWATER WITH PVDF HOLLOW FIBER GAS MEMBRANE

摘要

In this paper, the extraction of bromine from seawater and brine was studied with new type macromolecule polyvinylidene fluoride (PVDF) hollow fiber gas membrane. The results showed that increased pressure difference between two sides of the membrane can not improve flux J, so the impetus of this mass transfer process was not pressure difference, but concentration difference. Mass transfer coefficient k increased weakly with the increased pressure difference. Efficiencyη, mass transfer coefficient k and flux J were proportional to temperature.ηand k were more obvious than J, J increased greatly with the increased concentration of seawater. The influence on η, k and J caused by velocity of seawater was neglected with cycling method.