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Thin film composite forward osmosis membranes with performance enhancing layers

A thin-film composite material and forward osmosis technology, applied in the field of performance enhancement layer, can solve the problems of interfering polyamide active layer interface polymerization method, swelling, aggravating ICP, etc.

Active Publication Date: 2017-10-13
IBM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophobic nature of TFC carrier membranes such as PSF can still block the mixing of water and salt, which can exacerbate ICP
[0004] To be useful in FO applications, the wetting behavior of porous support layers in TFC separators can also be improved by using hydrophilic polymers such as polybenzimidazole (PBI) and cellulose acetate (CA), but when exposed to water These hydrophilic carrier layers may swell, which reduces the mechanical stability of the carrier layer
Hydrophilic support materials may also interfere with the interfacial polymerization method used to form the polyamide active layer

Method used

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  • Thin film composite forward osmosis membranes with performance enhancing layers
  • Thin film composite forward osmosis membranes with performance enhancing layers
  • Thin film composite forward osmosis membranes with performance enhancing layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] Porous Support for TFC FO Separators Modified with Star Polymer SP 1

[0140] The SP 1 star polymer used in Example 1 contained hydrophilic arms with 55 mole % amine moieties (—N(CH 3 ) 2 ) and 45 mol% polyethylene glycol moieties (x=0.45 in Formula 3(a)).

[0141] A pre-wet TFC FO membrane from HTI, LLC was placed within the frame to allow coating of only the porous support side of the membrane. Using an air knife, excess water was removed and a 0.1 wt% solution of SP 1 star polymer in water was added to the frame. After 2 hours, the star polymer solution was removed and the membranes were dried with an air knife for 5 seconds, then rinsed with deionized (DI) water and stored in water until the membranes were evaluated.

[0142] Figure 2 shows the unmodified and modified SEM image of TFC FO membrane. As shown in the cross-sectional view (Fig. 2(a)), a very thin polyamide active layer (100–200 nm, not clearly visible at a given magnification) is supported by a...

Embodiment 2

[0148] Porous Support for TFC FO Separator Modified with Star Polymer SP 2

[0149] The star polymer, referred to herein as SP 2, comprises hydrophilic arms with 100 mole percent amine moieties (x = 1 in Formula 3(a) above).

[0150] Using the procedure described in Example 1 above, the pores of the HTI TFC FO membrane were modified with SP2. SP 2 modified TFC FO membranes also showed enhanced FO performance in both FO and PRO modes, as Figure 5-6 shown.

Embodiment 3

[0152] Porous Support for TFC FO Separators Modified with Star Polymer SP 3

[0153] The SP 3 star polymer comprises a hydrophilic arm with 35 mol% carboxylate moieties (-COOH) and 65 mol% polyethylene glycol moieties (x = 0.35).

[0154] Using the procedure described in Example 1 above, the pores of the HTI TFC FO membrane were modified with SP3. TFC FO membranes modified with SP 3 showed enhanced FO performance in PRO mode ( Figure 7 ).

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Abstract

A thin film composite (TFC) forward osmosis (FO) membrane includes a porous support with surfaces having thereon a hydrophilic self-assembled monolayer. An active layer on the support is sufficiently dense to remove an ionic species from a liquid.

Description

technical field [0001] The present invention relates to thin film composite forward osmosis membranes, especially those having performance enhancing layers. Background technique [0002] Osmosis-driven membrane processes (ODMP) such as forward osmosis (FO) and pressure-retarded osmosis (PRO) have many applications, including seawater desalination, wastewater treatment, emergency rescue, and power generation. In forward osmosis (FO), an osmotic pressure gradient drives water from a feed solution through a semi-permeable membrane to a highly concentrated draw solution. Compared with pressure-driven diaphragm methods such as reverse osmosis (RO), FO operates at near-zero hydraulic pressure, which can reduce diaphragm fouling and obtain lower operating costs. [0003] In some embodiments, thin film composite (TFC) polyamide RO membranes may include a polyamide active layer formed by interfacial polymerization on at least one support membrane, such as polysulfone (PSF). The TFC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D71/80B05D1/18C08J9/42
CPCB01D71/56B01D71/80B01D71/82B01D2323/30B01D2325/36B01D67/0088B01D2323/21826B01D61/0024B01D69/1214B01D69/106B01D69/107B01D69/1216B01D69/1251B01D69/108B05D1/18C08J9/42
Inventor 罗英惠G·J-M·迪布瓦J·斯莱V·皮乌诺娃R·D·米勒D·斯蒂尔曼
Owner IBM CORP
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