B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/16
B01D 69/08 (2006.01) B01D 67/00 (2006.01) B01D 71/68 (2006.01) C08J 3/09 (2006.01)
Patent
CA 1321687
36-21(5441) PROCESS AND DOPE FOR FORMING ASYMMETRIC GAS SEPARATION MEMBRANES HAVING GRADED DENSITY SKINS Abstract of the Disclosure A process and dope are disclosed for forming high free volume, asymmetric gas separation membranes having graded density skins and macrovoid-free mor- phology from a solvent system comprising a Lewis acid, Lewis base, and a Lewis acid:base complex which dissolve hydrophobic polymers. The dopes have high total solids, high viscosity and low coagulation (g) values which enhance rapid gelation without the formation of macrovoids and which minimize densifi- cation. The dope solvent system complexes are readily disassociated by the coagulation medium and the component molecules are miscible in the medium which provides for rapid desolvation of the formed membrane thus providing a membrane having low residual solvent retention.
544615
Cruse Clint Allen
Fritzsche Alfred Keith
Handermann Alan Carl
Kesting Robert Emil
Malon Raymond Francis
Mcfadden Fincham
Permea Inc.
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