Dual-layer hollow fibers with enhanced flux as forward osmosis membranes for water reuses and protein enrichment

A fiber and hollow technology, applied in the field of double-layer polybenzimidazole-polyethersulfone hollow fiber membrane

Inactive Publication Date: 2011-09-14
NAT UNIV OF SINGAPORE
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main obstacles to fully exploiting the potential of FO as a new-generation water production technology are: 1) a limited number of commercially available FO membranes with excellent separation performance; the desired draw solution for water separation; and 3) how to optimize the FO method to its theoretical efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dual-layer hollow fibers with enhanced flux as forward osmosis membranes for water reuses and protein enrichment
  • Dual-layer hollow fibers with enhanced flux as forward osmosis membranes for water reuses and protein enrichment
  • Dual-layer hollow fibers with enhanced flux as forward osmosis membranes for water reuses and protein enrichment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1 : Morphology of PBI-PES-PVP double-layer hollow fiber membrane

[0064] The bilayer films thus produced had an outer diameter of 522 μm and an inner diameter of 290 μm, respectively (SEM images not shown here). image 3 The cross-sectional (CS) morphology is shown, which consists of a PBI-selective outer layer (OL) of approximately 20 μm, a fully porous spongy PES inner layer (IL) and a delamination-free interface. Beneath the PBI selectivity layer, there exists a image 3 The interface shown in the OL-IS section directly and openly connects many macropores, while the outer surface of the inner layer is porous, as shown in the IL-OS section.

[0065] Therefore, there is not much resistance at the interface. Since the inner layer and inner layer surface are fully porous as shown in the corresponding IL and IL-IS photographs, the PBI outer layer is the resistive and selective layer. However, as shown in their OL photographs, the average thickness of the sel...

Embodiment 2

[0067] Example 2 : Solute Retention on PBI-PES-PVP Bilayer Hollow Fiber Membranes

[0068] Figures 4(A) to (C) show solute separation, probability density and cumulative distribution curves for pore size. Table II below summarizes the results for solute rejection on a double layer hollow fiber forward osmosis membrane.

[0069] Table II: Solute rejection characterization results of PBI-PES-PVP bilayer membranes

[0070]

[0071] The average pore size of the radius (μ p ) is 0.27nm, indicating that the membrane obtained in the embodiment is located between the nanofiltration membrane and the reverse osmosis membrane. At an operating pressure of 1 bar, the pure water permeability (PWP) of this membrane is only 0.9 LMH. The pore size distribution or probability density curve shown in FIG. 4(B) indicates that the bilayer hollow fiber membrane has a narrow pore size distribution. This is necessary to retain ions and contaminants. Other features revealed that its response ...

Embodiment 3

[0072] Example 3 : Water improvement via PBI-PES-PVP double-layer hollow fiber membrane

[0073] In Fig. 5 it is shown that water and salt fluxes versus MgCl in two different modes of operation (i.e. FO and PRO) 2 Concentration dependence. It shows that with increasing driving MgCl 2 concentration, the water flux increases, while in any case the salt flux is sufficiently low. Typically, the water flux is five times higher than the salt flux when using the corresponding same draw solution in FO tests. It is believed that the increased water flux with increasing draw solution concentration is mostly due to the increased osmotic pressure as the driving force in both modes of operation. In addition, the water permeate flux in PRO mode is higher than in FO mode. This is due to a more pronounced reduction in the net driving force in the FO mode than in the PRO mode, since the sharp dilution inner concentration polarization occurs in the porous support layer (ie, in the PES-PVP...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
molecular weightaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

A hollow fiber includes a lumen, a polymeric membrane defining the lumen, and a porous tubular substrate, a circumferential surface of which is in contact with a circumferential surface of the polymeric membrane. The polymeric membrane includes a first polymer having monomers each containing an imidazole group. The hollow fiber can be used for water reclamation and protein enrichment

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority of US Provisional Application No. 61 / 105,556, filed October 15, 2008, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to bilayer polybenzimidazole-polyethersulfone (PBI-PES) hollow fiber membranes for water modification in the forward osmosis (FO) process. Another aspect of the present invention proposes that the FO method can be used to enrich and concentrate pharmaceutical products from dilute media without denaturing the components of interest. Background technique [0004] Forward (or direct) osmosis (FO), a new method with very low energy loss for water reuse, desalination and dehydration of water streams, has received increasing attention from many disciplines such as water improvement, wastewater Treatment, seawater desalination, concentration of liquid food, controlled release of pharmaceuticals v...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02C02F1/44B01D69/08B01D71/64B01D63/00B01D71/62
CPCB01D69/088B01D71/68B01D71/62B01D63/02B01D69/08B01D71/06
Inventor 杨乾王开宇T-S·钟
Owner NAT UNIV OF SINGAPORE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap