Permeation and separation of organic solvents by porous inorganic membranes

The purpose of The present study is to prepare porous ceramic membranes having various大小porediameters and investigate the permembranes . ceramic membranes，which were prepared by sl-gel procedureWe have successfully prepared porous ceramic membranes from silicia -zirconia composite colloidal solsolutions We have the transport mechanism of liquids through ceramic membrane havingrelatively large pores (larger than 70 nm) obeys the viscous flow mechanismwhile the transport mechanism deviated from the viscous flow mechanism for membranes having smallerpore sizes. The reason was speculated that The affinity between permeating molecules and membranesurface and size plays an important role in determining permeation mechanism.Reverse osmosisexperiments were carried out for several type of solutes in ethanol solutions. solutes sued weren-hexane (C - D26 D2H D214 D2H D2, molecular weight 86), n-decane (C - D210 D2H D222 d2e D2, MW 142)，and n-teradecane (cy D214 D2H D230 D2, MW 142) as alkane solutes，n-hexanol (C - D26 D2H D2H D213 D2OH, MW 102), n-octanol （C - D28 D2H D2H D217 D2OH, MW 130）n-decanol (C - D210 - D2H - D221 - D2OH，MW 1258)和alcohols. Solutes were rejected by porous membranes having pore size smaller than 1nm。Rejection at 3mpa and 60℃ranges from 0.4 to 0.8，depending on the type of molecular weights.我们已发现分离组织molecularmixtures cane be separated by porous ceramic membrane in reverse osmosis. Analysis of transportmechanism suggested diffusivity in pores was significantly affected by viscosity of solvents in viscositypores。

The purpose of the present study is to prepare porous ceramic membranes having various size of pore diameters and investigate the permeation performance of ceramic membranes.Ceramic membranes, which were prepared by sl-gel procedure, We have successfully prepared porous ceramic membranes from silica-zirconia composite colloidal sol solutions We have found that the transport mechanism of liquids through ceramic membrane having relatively large pores (larger than 70 nm) obeys the viscous flow mechanism, while the transport mechanism deviated from the viscous flow mechanism for membranes having smaller pore sizes. The reason was speculated that the affinity between permeating molecules and membrane surface and size plays an important role in determining permeation mechanism.Reverse osmosis experiments were carried out for several types of solutes in ethanol solutions. Solutes sued were n-hexane (CィイD26ィエD2HィイD214ィエD2, molecular weight 86), n-decane (CィイD210ィエD2HィイD222ィエD2, MW 142), and n-teradecane (CィイD214ィエD2HィイD230ィエD2, MW 142) as alkane solutes, and n-hexanol (CィイD26ィエD2HィイD213ィエD2OH, MW 102), n-octanol (CィイD28ィエD2HィイD217ィエD2OH, MW 130), n-decanol (CィイD210ィエD2HィイD221ィエD2OH, MW 1258) and alcohols. Solutes were rejected by porous membranes having pore size smaller than 1 nm. Rejection at 3 MPa and 60℃ ranges from 0.4 to 0.8, depending on the type of molecular weights. We have found that separation of organic molecular mixtures cane be separated by porous ceramic membrane in reverse osmosis. Analysis of transport mechanism suggested that diffusivity in pores was significantly affected by viscosity of solvents in pores.