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High performance composite membrane

A composite membrane and performance technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as high cost, time-consuming, and moderate changes in coating thickness

Inactive Publication Date: 2001-07-18
科克梅姆布莱尼系统公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the disadvantages of gravure coating is that modest changes in coating thickness typically require a redesign of the groove characteristics of the gravure roll i.e. groove depth, spacing, groove wall dimensions, and then etch
This is a time consuming and costly method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Tandem Compensation Grooved Roll / Slot Die Coating - Reverse Osmosis

[0062]A number of membranes were formed on a polysulfone ultrafiltration matrix (having an average pore size of 0.01 micron) produced by Koch Membrane Systems of Wilmington, Massachusetts (KMS), respectively. In each case, the gravure roll coating was first compensated with a 2% by weight aqueous solution of m-phenylenediamine (MPD) with 0.15% by weight of sodium lauryl sulfate as a surfactant. Subsequent solvent layers were applied wet-wet with a slot die in tandem with the compensating grooved roll. The solvent layer included 1% by weight trimelliticoyl chloride (TMC) in hexane, VM&P Naphtha HC co-solvent composition. The concentration or dry coverage of the MPD and TMC was varied with a high precision cavity pump. The web speed used was varied between 65 and 200 ft / min (20 and 60 m / min). The dry bulb temperature was varied between 50 and 80°C.

[0063] Table 1 shows the results of ex...

Embodiment 2

[0068] Example 2: Tandem Slot Die Coating - Reverse Osmosis

[0069] This example illustrates the effect of small changes in the equimolar or stoichiometric ratio between MPD and TMC functional groups on the performance of reverse osmosis membranes obtained by tandem slot die coating. The optimal stoichiometry of MPD and TMC is shown in Table 2.

[0070] As in Example 1, membranes were formed on a KMS polysulfone ultrafiltration matrix with an average pore size of 0.1 micron. The substrates were initially slot die coated with a 3% by weight aqueous solution of MPD with 0.15% by weight sodium lauryl sulfate surfactant. As in Example 1, subsequent solvent layers were coated wet-wet with a second slot die in tandem with the first slot die. This solvent layer contained 1% TMC in hexane and VM & PNaphthaHC co-solvent composition. The dry coating speed is achieved with a high precision cavity pump. As can be seen from Table 2 below, varying the web speed from 65 to 200 fpm did n...

Embodiment 3

[0076] Example 3: Tandem Slot Die Coating - Reverse Osmosis

[0077] Table 3 provides additional tests of the effect of dry coverage of components on the flux and rejection characteristics of interfacially polymerized reverse osmosis membranes under the test conditions shown in Example 2.

[0078] table 3

[0079] dry coverage

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Abstract

A process for producing high quality reverse osmosis, nanofiltration, and ultrafiltration membranes in a high speed process provides membranes which have excellent rejection characteristics coupled with high flux capabilities. The process employs tandem coating techniques to coat a microporous substrate with a thin membrane on the order of 25 ANGSTROM to 1.0 microns. The tandem coating process comprises tandem offset gravure and subsequent slot die coating applicators, or alternatively comprises tandem slot die coating applicators. For reverse osmosis and nanofiltration membranes, a wet-on-wet coating process is used to coat a porous substrate first with an aqueous solution, and then with an organic solution to produce a cross-linked, interfacially polymerized composite membrane. Single slot coating applicators are utilized to produce ultrafiltration membranes.

Description

Background of the invention [0001] The present invention relates to permselective membranes in the form of membranes for the selective separation of fluid mixtures, fluids and particles, and solutions. More specifically, the present invention relates to methods of manufacturing permselective membranes for reverse osmosis, nanofiltration, ultrafiltration, and the like. [0002] It is known that dissolved substances such as salts and minerals etc. can be separated from their solvents such as water by a technique called reverse osmosis. For example, reverse osmosis membranes can be used to significantly reduce the mineral and salt content of seawater to produce drinking water and / or low brine for industrial use. Similarly, softened water for domestic or industrial use can be obtained from relatively hard water with a high total dissolved solids content. Demineralized water is important for prolonging the life of various precision instruments and producing water suitable for var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/56B05D1/26B05D1/36B05D7/00
CPCB05D1/36B01D69/125B01D71/56B05D7/54B01D69/10B01D69/1071B01D69/1251
Inventor 威廉·C·赖斯约翰·P·普格利亚
Owner 科克梅姆布莱尼系统公司
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