C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
196/259, 18/32
C08J 9/36 (2006.01) B01D 67/00 (2006.01) B01D 71/10 (2006.01)
Patent
CA 1254007
Abstract of the Disclosure A method for preswelling and drying, hydrophilic regenarated cellulose membranes involving solvent exchange with a hydrogen bond breaking hygroscopic polar solvent followed by drying. The resulting, membrane can be directly used without further treatment for polar organic liquid permeation such as polar dewaxing solvents from dewaxed oil. Preferred hygroscopic polar solvents are sulpholane, dimethyl-sulphoxide (DMSO), dimethylformamide (DMF), n-methyl pyrrolidone (NMP), other disubstituted sulphoxides, disubstituted sulphones, other disubstituted formamides and dimethylamine (DMA) and morpholine. Most preferred solvent is DMSO. The method of the present invention is useful not only for pretreating fresh membrane material but also for recovering the permeability of damaged membranes (i.e. dried, water damaged or pressure damaged membranes).
456319
Hafez Mahmoud M.
Koenitzer Bernard A.
Borden Ladner Gervais Llp
Imperial Oil Limited
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