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Thin films covalently bonded to cellulose ester membranes and methods of making same

A technology of cellulose ester and cellulose, which is applied in the field of film covalently bonded with cellulose ester film and its preparation, and can solve the problems such as the decline of membrane rejection rate

Inactive Publication Date: 2019-09-27
FLUID TECH SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Crosslinking within the porous support leads to the formation of membrane defects such as macropores and macrovoids
Large voids create cracks in the polyamide layer and membrane rejection drops dramatically

Method used

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  • Thin films covalently bonded to cellulose ester membranes and methods of making same
  • Thin films covalently bonded to cellulose ester membranes and methods of making same
  • Thin films covalently bonded to cellulose ester membranes and methods of making same

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Embodiment Construction

[0021] Embodiments disclosed herein relate to membranes for use in filtration applications including reverse osmosis, forward osmosis, nanofiltration, pressure assisted forward osmosis, and pressure retarded osmosis. Also provided are methods for making these membranes, as well as membrane modules comprising these membranes. The membranes and membrane modules disclosed herein can be used in any application using existing filtration membranes, for example, concentration of industrial or agricultural waste through forward osmosis, or mixing of water with different salinities for power generation through pressure retarded osmosis.

[0022] The membranes disclosed herein include a porous cellulose layer, a polyamide film layer, and a fabric support layer. The polyamide film layer can be covalently bonded to the surface of the porous cellulose layer. By covalently bonding these two layers, the strength and durability of the film can be increased, layer-to-layer detachment can be r...

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PUM

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Abstract

Embodiments disclosed herein are directed to membranes for filtration, methods of manufacturing the same, and membrane modules incorporating the same. In an embodiment, a membrane is disclosed. The membrane includes a porous cellulose layer, a polyamide thin film layer bonded to the porous cellulose layer, and a fabric support layer that supports the porous cellulose layer and the polyamide thin film layer. The porous cellulose layer has a pore size of about 30 nm to about 500 nm at an exposed surface of the porous cellulose layer.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application 62 / 393,595, filed September 12, 2016, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] High-performance filtration membranes such as those used in forward osmosis or reverse osmosis include dense layers with high permeability and porous layers with low diffusion resistance. Materials used to construct such membranes include porous layers of cellulose acetate, although relatively high osmotic resistance in dense layers may hinder their flux. Thin film composite membranes can have higher flux but also higher diffusion resistance than cellulose acetate layers. Due to the challenges of bonding a dense layer of polyamide to a porous layer with low diffusion resistance, thin-film composite membranes typically cannot replicate the low diffusion resistance of cellulose acetate. [0004] The polyamide layer c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00
CPCB01D71/56B01D69/02B01D2323/30B01D2325/04B01D2325/20B01D69/105B01D71/16B01D69/1251B01D63/101B01D67/0006B01D71/14C08J5/18C08J2301/10C08J2377/06
Inventor 约翰·赫伦爱德华·杰拉德·博德里
Owner FLUID TECH SOLUTIONS INC