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Methods for reducing ion exchange and reverse salt flux phenomena in membranes for osmotically driven membrane processes

A technology for ion exchange and permeable membranes, applied in the field of reducing ion exchange and reverse salt flow phenomena in membranes used for osmotically driven membrane processes, which can solve problems such as limitations

Inactive Publication Date: 2015-12-09
NAGARE MEMBRANES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at the current state of these technological developments, non-idealities continue to limit the full realization of this potential

Method used

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  • Methods for reducing ion exchange and reverse salt flux phenomena in membranes for osmotically driven membrane processes
  • Methods for reducing ion exchange and reverse salt flux phenomena in membranes for osmotically driven membrane processes
  • Methods for reducing ion exchange and reverse salt flux phenomena in membranes for osmotically driven membrane processes

Examples

Experimental program
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Effect test

Embodiment 2

[0046] In a second embodiment, the film surface may be coated with polyvinyl alcohol ("PVA"). In contrast to the first example, coating the membrane surface with PVA made the membrane surface less negative. Similar to the first example, coating the surface of the film with PVA also made the surface of the film smoother. In one embodiment, the PVA is adsorbed to the membrane surface by electrostatic interactions and / or van der Waals forces.

Embodiment 3

[0048] In a third example, the membrane surface can be coated with chitosan composed of randomly assigned β-(1-4) linked D-glucosamine (deacetylation unit) and N- Linear polysaccharide composed of acetyl-D-glucosamine (acetylated units). Similar to the first embodiment, coating the film surface positively charges the surface.

[0049] Surface Charge Modification Example 4

[0050] As a fourth example, the membrane surface can be coated with PEI or chitosan as described in example 1 or 3. Subsequently, the previously coated film surface can be coated with smoother and more charge neutral molecules. Some materials for this second coating step may include polyacrylic acid (PAA), polyethylene sulfate (PVS), or sulfonated poly(ether ether ketone) (SPEEK).

[0051] Surface Charge Modification Example 5

[0052] As a fifth example, a polymer such as polyethylene oxide (PEO) and / or polyethylene glycol (PEG) can be used to graft polymerize the surface film by free radical polymeriz...

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Abstract

A method of modifying a semi-permeable osmotic membrane including treating the membrane to reduce at least one of an ion exchange and reverse draw solute flux phenomena in osmotically driven membrane process.

Description

[0001] Cross-References to Related U.S. Patent Applications [0002] This application claims U.S. Provisional Patent Application No. 61 / 725,026, entitled "Methods for Reducing Ion Exchange and Reverse Salt Flow Phenomena in Membranes Used in Osmotically Driven Membrane Processes," filed November 12, 2012 priority. The entire content of the provisional application is hereby incorporated by reference in its entirety. technical field [0003] One or more aspects relate to the formation or modification of semipermeable membranes to reduce the occurrence of ion exchange and reverse salt flow phenomena for use in an osmotically driven membrane process ("ODMP"). Background technique [0004] The potential of ODMPs to reduce costs and increase the efficiency and efficacy of membrane separations and power production from osmotic pressure gradients is evident. However, at the current state of these technological developments, non-idealities continue to limit the full realization of...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D61/02B01D69/12
CPCC02F1/445B01D61/002B01D67/0093B01D69/125B01D71/38B01D71/56B01D71/60B01D2323/04B01D2323/30B01D2323/36B01D2323/38B01D2325/06B01D2325/16C02F1/44B01D67/00931B01D69/1251B01D71/381
Inventor R·麦金尼斯
Owner NAGARE MEMBRANES