Hydrophobic membrane,hydrophobic performance evaluation and spontaneous dehydration drying
This article introduces the definition of porous hydrophobic membranes,the concept of critical wetting value,the permeability pressure value of hydrophobic membranes,and the testing method of critical wetting value.Different from the usual methods such as external heating,this article introduces two methods of self dehydration and drying of hydrophobic membranes by utilizing the inherent characteristics of hydrophobic membrane materials.One method is to control the wetting process of membrane fouling.When the depth of membrane pores being wetted is less than the critical wetting value of the hydrophobic membrane material,membrane cleaning is used to achieve spontaneous dehydration and drying of the hydrophobic membrane.Another method is to construct a hydrophilic and hydrophobic bilayer composite hydrophobic membrane.When the membrane runs until the conductivity of the produced water increases significantly,it is shut down for cleaning.By utilizing the characteristic that the adhesion between hydrophilic materials and water is greater than that between hydrophobic materials and water,the hydrophobic membrane pores are spontaneously dehydrated and dried.
hydrophobic membranecritical wetting valueliquid entry pressure,drying of hydrophobic membranespontaneous dehydration
NETL
NSTL
万方数据
维普
