Aromatic polyamides for reverse osmosis and methods of their permselective polymeric membranes

• US 3,878,109 A
• Filed: 02/12/1973
• Issued: 04/15/1975
• Est. Priority Date: 08/30/1972
• Status: Expired due to Term

• Current Assignee: Kojuro Ikeda, Noriaki Dokoshi, Ryoichi Bairinji
• Original Assignee: Kojuro Ikeda, Noriaki Dokoshi, Ryoichi Bairinji
• Inventors: Ikeda, Kojuro, Bairinji, Ryoichi, Dokoshi, Noriaki
• Primary Examiner(s): Spear, Jr., Frank A.
• Assistant Examiner(s): Lander, Ferris H.
• Application Number:
  US05/331,689
• Time in Patent Office: 792 Days
• Field of Search: 210/23,321,500,490 264/41,49 260/78TF
• US Class Current: 210/500.38
• CPC Class Codes: B01D 61/025 Reverse osmosis; Hyperfiltration
• CPC Class Codes: B01D 61/145 Ultrafiltration
• CPC Class Codes: B01D 71/56 Polyamides, e.g. polyester-amides
• CPC Class Codes: C08G 69/32 from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound

Abstract

Permselective membranes are prepared from novel synthetic organic aromatic polyamides of the formula

The membranes are useful in separating components of fluid mixtures or solution such as water containing dissolved salts or lactam.

D R A W I N G

Claims

1. A PERMSELECTIVE POLYMERIC MEMBRANE CONSISTING ESSENTIALLY OF A SYNTHETIC ORGANIC AROMATIC POLYAMIDE REPRESENTED BY THE FORMULA:

2. A membrane of claim 1 wherein said R1 groups substituted with X1 groups are represented by structures selected from the class consisting of

3. A membrane of claim 1 wherein said R2 groups are represented by structures selected from the class consisting of

4. A membrane of claim 1 where in said R3 groups substituted with X2 groups are represented by structures selected from the class consisting of

5. The membrane of claim 1 wherein A is H, Li, Na, K, Mg, Ca or organic amines selected from the class consisting of methylamine, ethylamine, propylamine, butylamine, aniline, cyclohexylamine, ethanol amine, p-phenylenediamine, m-phenylenediamine, 4, 4-biphenyl ether diamine, benzidine, p-oxyaniline, m-oxyaniline, and methylene bis aniline.

6. A permselective polymeric membrane as claimed in claim 1 wherein not more than 70 mole percent of said organic aromatic polyamide is replaced by the repeating unit represented by the formula: