| abstract |
Methods for preparing a gas separation membrane system can include depositing a gas-selective membrane layer upon a surface of a tubular porous support, annealing the gas-selective membrane layer to form an annealed gas-selective membrane layer, polishing the annealed gas-selective membrane layer under a controlled polishing condition to form an abraded membrane surface, depositing another gas-selective membrane layer upon the abraded membrane surface of the tubular porous support, and successively iterating the annealing, polishing and depositing operations until a leak-tight membrane system is formed. The controlled polishing condition comprises utilizing a rotary fibrous buff that includes a plurality of abrasive particles adhered to a fibrous support with a polymeric binder. |