Composite Perfluorohydrocarbon Membranes, Their Preparation and Use

a perfluorohydrocarbon membrane and perfluorohydrocarbon technology, applied in the field of composite perfluorohydrocarbon membranes, can solve the problems of poor separation, adversely affecting separation efficiency, solvent wet out, etc., and achieves the effects of improving solvent resistance, cost-effective and industrially feasible, and improving uniform pore structur

Inactive Publication Date: 2007-11-08
POROGEN
View PDF22 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038]The invention has many advantages. For instance, it provides a simple, cost effective, and industrially feasible process for the preparation of composite porous PAEK membranes, modified with a perfluorohydrocarbon surface layer. The composite membranes exhibit improved uniform pore structure, are solvent resistant and can operate at high temperatures. The composite porous P...

Problems solved by technology

These membranes exhibit non-uniform broad pore size distribution that adversely affects separation efficiency.
A broad pore size distribution can re...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite Perfluorohydrocarbon Membranes, Their Preparation and Use
  • Composite Perfluorohydrocarbon Membranes, Their Preparation and Use
  • Composite Perfluorohydrocarbon Membranes, Their Preparation and Use

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparative Example 1

[0110]This preparative example describes preparation of porous PEEK substrate modified with hydroxyl groups in a single step pore formation surface modification process.

[0111]A precursor 25μ thick film was obtained by compression molding PEEK / PEI blend (50:50 by weight pre-blended in a twin extruder) at ca. 370° C. followed by quenching in water. The film was then heat treated at 250° C. for 1 hour to affect crystallization of PEEK polymer. The film was then placed into neat monoethanolamine solution maintained at 120° C. for 4 hours. The solution was blanketed with nitrogen. The thus formed porous PEEK film was washed with IPA and then Soxlet extracted with methanol overnight. The porous film was then dried under vacuum at 80° C. overnight. The elemental analyses indicated that the film contained 1.26% of nitrogen. No residual polyimide was detected by FT-IR analyses. The nitrogen presence was attributed to formation of imine groups.

example 2

Preparative Example 2

[0112]This preparative example describes preparation of porous PEEK substrate without surface modification.

[0113]A precursor film was obtained by compression molding PEEK / PEI bled (50:50 by weight pre-blended in a twin extruder) at ca. 370° C. followed by quenching in water. The film was then heat treated at 250° C. for 1 hour to affect crystallization of PEEK polymer. The film was then placed into solution comprised of DMF, monoethanolamine and water 90 / 5 / 5 by volume at 100° C. for 4 hours. The solution was blanketed with nitrogen. The thus formed porous PEEK film was washed with IPA and then Soxlet extracted with methanol overnight. The porous film was then dried under vacuum at 80° C. overnight. The elemental analyses indicated that the film contained 0.09% of nitrogen. No residual polyimide was detected by FT-IR analyses. The results indicate that thus obtained porous PEEK substrate is essentially free of surface modification via imine group formation.

example 3

Preparative Example 3

[0114]This preparative example demonstrates preparation of PEEK substrate functionalized with hydroxyl groups by selective reduction of surface ketone groups.

[0115]A porous PEEK film prepared as described in Preparative Example 2 was pre-dried under vacuum at 100° C. overnight. The pre-dried film was then placed into a 0.1% sodium borohydride solution in isopropyl alcohol and refluxed for 8 hours. The film was then washed sequentially with dilute HCl solution (0.1N) and distilled water and then dried under vacuum at 80° C. to a constant weight. The thus obtained film was found to be highly hydrophilic and spontaneously wetted with water.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Pore sizeaaaaaaaaaa
Pore sizeaaaaaaaaaa
Pore sizeaaaaaaaaaa
Login to view more

Abstract

Composite porous hydrophobic membranes are prepared by forming a perfluorohydrocarbon layer on the surface of a preformed porous polymeric substrate. The substrate can be formed from poly(aryl ether ketone) and a perfluorohydrocarbon layer can be chemically grafted to the surface of the substrate. The membranes can be utilized for a broad range of fluid separations, such as microfiltration, nanofiltration, ultrafiltration as membrane contactors for membrane distillation and for degassing and dewatering of fluids. The membranes can further contain a dense ultra-thin perfluorohydrocarbon layer superimposed on the porous poly(aryl ether ketone) substrate and can be utilized as membrane contactors or as gas separation membranes for natural gas treatment and gas dehydration.

Description

RELATED APPLICATIONS[0001]This application claims the benefit under 35 USC 119(e) of U.S. Provisional application No. 60 / 797,521, filed on May 4, 2006 which is incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]The invention was made with government support under Grant No. DE-FG02-05ER84250 awarded by the Department of Energy (DOE). The government has certain rights in the invention.FIELD OF THE INVENTION[0003]This invention generally relates to composite perfluorohydrocarbon membranes, their preparation and their use.BACKGROUND OF THE INVENTION[0004]Porous polymeric membranes are well known in the art and are used widely for filtration and purification processes, such as filtration of waste water, preparation of ultra pure water and in medical, pharmaceutical or food applications, including removal of microorganisms, dialyses and protein filtration. Porous polymeric membranes are used to separate components of liqui...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D71/06
CPCB01D69/12B01D71/32B01D2325/34B01D71/78B01D2323/18B01D71/38Y02P20/129B01D69/1213B29C67/202B29C71/02B29C2071/022B29K2071/00B29K2105/041B29L2031/755
Inventor DING, YONGBIKSON, BENJAMIN
Owner POROGEN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap