Silicone-coated organic solvent resistant polyamide composite nanofiltration membrane, and method for preparing the same

• US 6,887,380 B2
• Filed: 05/17/2002
• Issued: 05/03/2005
• Est. Priority Date: 10/19/2001
• Status: Expired due to Term

• Current Assignee: Korea Research Institute of Chemical Technology
• Original Assignee: Korea Research Institute of Chemical Technology
• Inventors: Yun, Hyung-Gu, Kim, In-Chul, Lee, Kew-Ho
• Primary Examiner(s): FORTUNA, ANA M
• Application Number:
  US10/147,071
• Publication Number:
  US 20030098274A1
• Time in Patent Office: 1,082 Days
• Field of Search: 210/500.38, 210/490, 210/640, 210/652, 210/654, 96/6, 96/14, 95/45, 264/41, 264/45.1, 427/244, 427/245
• US Class Current: 210/500.38
• CPC Class Codes: B01D 69/125 In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
• CPC Class Codes: B01D 69/1251 by interfacial polymerisation
• CPC Class Codes: B01D 71/56 Polyamides, e.g. polyester-amides
• CPC Class Codes: B01D 71/70 Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only
• CPC Class Codes: B01D 71/701 Polydimethylsiloxane

Abstract

The present invention relates to a silicone-coated organic solvent resistant polyamide composite nanofiltration membrane and a method for preparing the same. More particularly, the present invention relates to a nanofiltration composite membrane that is not only rejection rate superior but also organic solvent stable and flux excellent, prepared by coating with silicone during the process of interfacial polymerization of polyamide on the surface of porous support; and a method for producing it.

Claims

1. An organic solvent resistant polyamide nanofiltration composite membrane comprising a porous support and a skin layer containing polyamide and silicone.

2. An organic solvent resistant polyamide nanofiltration composite membrane according to claim 1, for separation of a compound having a low molecular weight of 100-1000 dissolved in an organic solvent.

3. A process for preparing organic solvent resistant polyamide nanofiltration composite membrane by coating with silicone during the step of interfacial polymerization of diamine monomer and dicarboxylic acid monomer on the surface of a porous support to form the skin layer.

4. A process for preparing organic solvent resistant polyamide nanofiltration composite membrane according to claim 3, wherein each concentration of said diamine monomer, dicarboxylic acid monomer, and silicone-coated polymer is 0.1-10 wt. %, 0.005-5 wt. %, and 0.1-3 wt. %.

5. A process for preparing organic solvent resistant polyamide nanofiltration composite membrane according to claim 3, wherein said porous support is polyacrylonitrile ultrafiltration membrane.

6. A process for preparing organic solvent resistant polyamide nanofiltration composite membrane according to claim 3, wherein said silicone is polydimethylsiloxane.