EVONIK FIBRES GMBH Patent applications |
Patent application number | Title | Published |
20140345457 | METHOD FOR SEPARATING GASES - The invention relates to a special apparatus, in particular linkage of gas separation membrane modules, and a special method for separating gas mixtures containing helium. | 11-27-2014 |
20130098242 | PROCESS FOR SEPARATION OF GASES - The invention relates to a specific apparatus, more particularly a chain of gas separation membrane modules, for separation of gas mixtures into two fractions each of elevated purity. | 04-25-2013 |
20120123079 | POLYIMIDE MEMBRANES MADE OF POLYMERIZATION SOLUTIONS - The invention relates to polyimide membranes and to a phase inversion method for the production thereof. The polyimide membranes can be used to separate different gas mixtures. | 05-17-2012 |
20100181253 | CROSS-LINKED POLYIMIDE MEMBRANES - The present invention provides a method for improving the performance of polyimide membranes as used in solvent-resistant nanofiltration. More specifically the method of the present invention allows to improve the solvent stability of the polyimide membranes to solvents or solvent mixtures that would dissolve polyimide under the conditions applied during the filtration, such as dimethylforrnamide (DMF), N-methylpyrrolidinone (NMP), dimethylacetamide (DMAC), tetrahydrofuran (THF), y-butyrolacton (GBL), dimethylsulphoxide (DMSO) and chlorinated solvents. | 07-22-2010 |