Thin film composite membranes for forward osmosis, and their preparation methods

A technology of forward osmosis membrane and composite membrane, applied in the field of forward osmosis membrane

Active Publication Date: 2015-06-10
海绵股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it remains a problem to provide high water flux in combination with other desirable membrane properties (e.g., low solute flux, fouling resistance, good machinability, etc.)

Method used

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  • Thin film composite membranes for forward osmosis, and their preparation methods
  • Thin film composite membranes for forward osmosis, and their preparation methods
  • Thin film composite membranes for forward osmosis, and their preparation methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 relates to the production of flat membranes according to the method of the present invention and the performance comparison of these membranes with commercially available FO membranes.

Embodiment 2

[0024] Example 2 relates to the configuration of carbon nanotubes incorporated in the support layer.

Embodiment 3

[0025] Example 3 relates to an acrylate modified poly(vinylidene fluoride) polymer support layer (other examples relate to a meta-aramid support layer).

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Abstract

Forward osmosis membranes having a hydrophilic support layer and a polyamide rejection layer in a thin film composite membrane are considered. Preferred support layer materials include aramid polymers and PVDF. A woven or non-woven mesh can be incorporated into the support layer to improve handling properties of the membrane. Flat sheet and hollow fiber configurations are possible. Antifouling techniques are provided. The polyamide layer can be formed on the hydrophilic support layer by interfacial polymerization. Applications include forward osmosis and pressure retarded osmosis applications, such as industrial product and / or waste concentration, hydration bags, energy / pressure generation, and controlled delivery of chemicals (e.g., for pharmaceutical applications).

Description

Technical field [0001] The present invention relates to membranes for forward osmosis. Background technique [0002] Forward osmosis is a process in which water flows from a solution with a higher water concentration (feed solution) to a solution with a lower water concentration (a draw solution). Membranes for forward osmosis and related processes of pressure delayed osmosis have been studied for many years. However, it is still a problem to provide a combination of high water flux and other required membrane characteristics (for example, low solute flux, pollution resistance, good machining characteristics, etc.). Therefore, providing improved membranes for forward osmosis and pressure retarded osmosis would be an advance in the art. Summary of the invention [0003] Thin film composite membranes are used to provide improved forward osmosis (FO) and pressure delayed osmosis (PRO) performance. These membranes include a hydrophilic support layer, which is preferably porous. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D69/12B01D61/02B01D71/34
CPCB01D61/002B01D61/025B01D67/0006B01D67/0079B01D67/0093B01D69/06B01D69/08B01D69/105B01D69/12B01D69/125B01D69/148B01D71/021B01D71/34B01D71/44B01D71/56B01D2323/38B01D2323/40C02F1/445F04B17/00F04B19/00B82Y30/00
Inventor R·列瓦努鲁一畯J·E·克拉尔A·诺伊O·巴卡金
Owner 海绵股份有限公司
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