摘要
根据Flory-Huggins理论和溶解-扩散模型,建立了323 K下聚乙烯醇(PVA)膜分离异丙醇水溶液过程的传质模型,模型计算值与实验值吻合良好.水与PVA膜的相互作用参数小于异丙醇与PVA膜的相互作用参数,说明水与膜间相互作用强于异丙醇与膜间的相互作用,水在膜中优先吸附溶解.水的塑化系数和无限稀释扩散系数都大于异丙醇的塑化系数和无限稀释扩散系数,说明水在膜中的溶解能力及扩散能力都大于异丙醇在膜中的溶解能力及扩散能力,水在PVA膜中优先透过.异丙醇与水的相互作用参数随异丙醇浓度的升高而增大,说明异丙醇浓度越高,PVA膜的选择性越好,渗透汽化分离效果越好.
Based on the Flory-Huggins theory and solution-diffusion model, the transport model of isopropanolwater system in polyvinyl alcohol （PVA） membrane was established at 323 K. The calculated values of the model were in a good agreement with experimental values. The interactional parameter between water and PVA membrane was less than that between isopropanol and PVA membrane, which showed that water was preferentially adsorbed and dissolved in PVA membrane. The plasticizing coefficient and infinite dilution diffusion coefficient of water were larger than those of isopropanol, which showed that the dissolution and pervasion of water were superior to those of isopropanol in PVA membrane, so water permeates preferentially. The interactional parameter between water and isopropanol rises with the increase of isopropanol concentration in the mixture, which showed that the higher isopropanol concentration leads to the higher selectivity of the membrane and the better separation effect of pervaporation.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2007年第6期694-698,共5页
Journal of Tianjin University(Science and Technology)
关键词
渗透汽化
异丙醇水溶液
溶胀平衡
渗透通量
模型
pervaporation
isopropanol-water system
swelling balance
permeate flux
model
