Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composite polyamide reverse osmosis membrane showing high boron rejection and method of producing the same

A technology of composite polyamide and reverse osmosis membrane, which is applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem that the removal rate has not been significantly improved.

Active Publication Date: 2007-10-17
SAEHAN INDS CO LTD
View PDF12 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent also teaches that when polyamide skins are treated with an aqueous solution of free chlorine in the absence of bromide salts, the removal rate is not significantly improved

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A 140 μm thick microporous polysulfone support including a support nonwoven was immersed in an aqueous solution containing 3% by weight of m-phenylenediamine (MPD) and 0.05% by weight of 2-ethyl-1,3-hexanediol for 40 Second. The support was drained and roll rolled to remove excess aqueous solution. Then, the coated carrier was immersed in 0.1% by weight of trimesoyl chloride (TMC) and 0.14% by weight of isophthaloyl chloride (IPC) in Isopar  solvent (Exxon Corp.) for 1 minute, followed by draining of excess organic solution on the support. Air-dry the obtained composite film for about 1 min, and then in 0.2% Na at room temperature 2 CO 3 Rinse in water for 30 minutes, then rinse in deionized water.

[0048] The initial membrane performance was measured by flowing an aqueous solution containing 32,000 ppm NaCl and 5 ppm boron (as boric acid) through the membrane in cross-flow mode at 800 psi, 25°C, pH 8. Salt removal rate and boron removal rate are 99.5% and 86% re...

Embodiment 2

[0054] The same procedure as described in Example 1 was carried out in Example 2, except that instead of treating the membrane with an aqueous solution containing sodium hypochlorite (NaOCl) and potassium iodide (KI) (presumably generating molecular iodine in situ), the membrane was treated with an aqueous solution containing 5 ppm Molecular iodine (I 2 ) at a pH of 9 to treat the membrane. The salt rejection rate, boron removal rate and flux were 99.7%, 94.1% and 14.1 gfd, respectively, which are recorded in Table 1.

Embodiment 3

[0056] The same procedure as described in Example 1 was carried out in Example 3, except that instead of treating the membrane with an aqueous solution containing sodium hypochlorite (NaOCl) and potassium iodide (KI) (presumably generating molecular iodine in situ), the membrane was treated with an aqueous solution containing 5 ppm A pH 9 aqueous solution of iodine bromide (IBr) treated the membrane. The salt rejection rate, boron removal rate and flux were 99.7%, 95.0% and 14.0 gfd, respectively, which are recorded in Table 1.

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The present invention provides a composite polyamide reverse osmosis membrane. The membrane includes a microporous support and a polyamide layer disposed over the microporous support, the polyamide layer including iodine atoms covalently bonded thereto. The membrane is preferably prepared by a process that includes the steps of providing a microporous support, forming a polyamide layer over the microporous support, and treating the polyamide layer with an aqueous solution comprising a compound, the compound comprising at least one iodine atom. Examples of the compound comprising at least one iodine atom include molecular iodine, iodine monobromide, iodine monochloride and iodine trichloride. The iodine-containing compound may be added to an aqueous solution and dissolved therein or may be formed in situ in the aqueous solution, for example, by adding to the aqueous solution an iodide salt and an oxidizing agent.

Description

technical field [0001] The invention mainly relates to a reverse osmosis membrane, and more particularly relates to a novel composite polyamide reverse osmosis membrane and a preparation method thereof. Background technique [0002] It is well known that solutes can be separated from their solvents by using various selective membranes including reverse osmosis membranes, ultrafiltration membranes and microfiltration membranes in order of small to large pore size. One previous application of reverse osmosis membranes was the desalination of brackish water or seawater to provide large quantities of relatively saline-free water suitable for industrial, agricultural or domestic use. The desalination of micro-water or seawater using reverse osmosis membranes is by passing brine through the reverse osmosis membrane, whereby the purified water passes through the membrane, while salt and other dissolved ions and molecules cannot pass through the membrane, t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12
CPCC02F1/441B01D69/02B01D71/56B01D61/025C02F2103/08B01D67/0093B01D69/125Y02A20/131B01D61/02
Inventor 具滋永洪成杓
Owner SAEHAN INDS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com