摘要
合成了一系列磷酸和二元羧酸酯化交联改性的聚乙烯醇(PVA)膜,研究了它们用于水-乙醇混合液的渗透气化分离规律。磷酸改性的PVA膜具有较大的通量,当料液浓度为50%时,通量可达1200g/m^2·hr.,分离系数α_(H_2O/EtOH)=10。丙二酸改性PVA膜在料液浓度为50%时,通量可达800g/m^2·hr.,且α_(H_2O/EtOH)=18。并作了这两种膜的通量和分离系数随料液浓度的变化曲线。草酸交联的PVA膜具有较高的分离系数,但通量很小。求出了水、乙醇及总的表现渗透活化能。
A series of polyvinyl alcohol (PVA) membranes crosslinked by esterification with phosphoric acid and dicarboxylic acids were synthesized. And the pervaporation separation of water-ethanol mixtures, both flux and separation, through them was studied.PVA membranes modified with phosphoric acid have greater flux. When the feed composition is 50wt.%, the flux reaches 1200 g/m^2 ·hr, and the separation factor α(H_2O/EtOH)=10. PVA membranes modified with malonic acid show good pervaporation behavior. When the feed composition is 50wt.%, the flux reaches 800 g/m^2·hr, α_(H_2O/EtOH)= 18. And the flux and separation factor through thesetwo kinds of membrane varying with feed composition were studied. On the otherhand, the PVA membranes crosslinked with oxalic acid have high separationfactor, but the flux is extremely small. The apparent permeation energy of activation of water, ethanol and their mixture were given.
出处
《功能高分子学报》
CAS
CSCD
1991年第3期231-239,共9页
Journal of Functional Polymers
关键词
聚乙烯醇
膜
分离
乙醇
水
polyvinyl alcohol, esterification crosslinking, membranes, pervaporation, separation of water-ethanol.
