Patent ID: 9555378
Date: 2017-01-31
CPC Classifications: B01D

Claim:
1. A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing an azo (—N═N—) content of from 0.75% to 0.95%, as measured by pyrolysis gas chromatography using ammonium dichromate as a calibration standard and pyrolizing the polyamide layer at 550° C. for 6 seconds; wherein the azo content refers to the amount of diazonium and azo coupling resulting from two aromatic compounds coupled by an azo (—N═N—) group, and wherein the thin film polyamide layer is further characterized by producing a ratio of dimers represented by Formula II and III from 2.0% to 4.0% upon pyrolysis at 650° C. as measured by GS MS.