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Double-layer composite hollow fiber nano-filtration membrane and preparation method and special tool thereof

A double-layer composite, nanofiltration membrane technology, applied in the field of membrane separation, can solve the problems of thin coating affecting separation performance, reducing membrane flux, etc., achieving good chemical and thermal stability, reducing manufacturing costs, and increasing pore size and pore size. rate effect

Active Publication Date: 2012-05-02
SUZHOU FAITH HOPE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical difficulty of composite film manufacturing is to form a flat composite film with a uniform surface thickness of 10-100 nanometers and no pinhole defects in the production of commercial films with a width of 1.0-1.6 meters and a length of several hundred meters.
A thick coating will reduce the membrane flux, while a thin coating will form local defects and affect the separation performance

Method used

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  • Double-layer composite hollow fiber nano-filtration membrane and preparation method and special tool thereof
  • Double-layer composite hollow fiber nano-filtration membrane and preparation method and special tool thereof
  • Double-layer composite hollow fiber nano-filtration membrane and preparation method and special tool thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] See Figure 4 , the middle of the figure is the double-layer composite hollow fiber nanofiltration membrane of this embodiment, including the selectively separated outer skin layer and the mechanical support inner layer; wherein, the upper left is the outer surface of the selectively separated outer skin layer, and the upper right is the selectively separated outer skin layer The inner surface of the lower left mechanically supports the outer surface of the inner layer, and the lower right mechanically supports the inner surface of the inner layer. There are membrane holes on the selective separation outer skin layer, the membrane hole diameter is 0.5-2 nanometers; the thickness of the selective separation outer skin layer is 10-10000 nanometers; the thickness of the inner layer of mechanical support is 1-3 mm; double-layer composite hollow fiber nanofiltration membrane The selectively separated outer skin layer and the mechanically supported inner layer are respectivel...

Embodiment 2

[0057] The tools used in this example are the same as those in Example 1, and the selected proportions and process conditions are shown in Table 2. Preparation of SPSF-PVC double-layer composite hollow fiber nanofiltration membrane.

[0058] Table 2 Preparation of SPSF-PVC double-layer composite hollow fiber nanofiltration membrane

[0059] Selective separation of outer skin layer casting solution (wt%)

[0060] The hollow fiber nanofiltration membrane module made of these silks has a rejection rate of 15% to 1mM / L of sodium chloride under 1 kg of operating pressure and an external pressure operation mode; the rejection rate of 1mM / L of magnesium chloride is 80%; The retention rates of methyl green and sunset yellow dyes are 85% and 95%; the pure water permeability is 0.8L / (m 2 .hr.atm).

Embodiment 3

[0062] The tools used in this example are the same as in Example 1, and the selected proportions and process conditions are shown in Table 3. Preparation of SPES-PAN double-layer composite hollow fiber nanofiltration membrane.

[0063] Table 3 Preparation of SPES-PAN double-layer composite hollow fiber nanofiltration membrane

[0064] Selective separation of outer skin layer casting solution (wt%)

[0065] Outer layer casting solution flow rate (ml / min)

[0066] The hollow fiber nanofiltration membrane module made of these silks has a rejection rate of 10% to 1mM / L of sodium chloride under 1 kg of operating pressure and an external pressure operation mode; the rejection rate of 1mM / L of magnesium chloride is 82%; The retention rates of methyl green and sunset yellow dyes are 89% and 95%; the pure water permeability is 1.8L / (m 2 .hr.atm).

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Abstract

The invention discloses a double-layer composite hollow fiber nano-filtration membrane and preparation method and special tool thereof, wherein the nano-filtration membrane comprises a selective separating outer sheath layer and a mechanical inner supporting layer; the selective separating outer sheath layer with the thickness of 10-10000 nm is provided with the membrane holes with the hole diameter of 0.5-2 nm, wherein the thickness of the mechanical inner supporting layer is 1-3mm; the selective separating outer sheath layer and the mechanical inner supporting layer of the double-layer composite hollow fiber nano-filtration membrane are respectively dissolved into the solvent through the high polymer of the selective separating outer sheath layer and the high polymer of the mechanical inner supporting layer. The invention can control the thickness of the selective separating outer sheath layer to be 10-100 nm, thereby greatly reducing the materials of the selective separating outer sheath layer and greatly lowering the cost. The invention effectively controls the internal / external diameter of the membrane, the effective hole diameter of the membrane, the hole rate and the hole diameter distribution by controlling the components of the liquid materials, the spinning condition, the condensing bath and the post processes so as to obtain the high effective separating membrane provided with the good hydrophilic performance, pollution proof and large water flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a double-layer composite hollow fiber nanofiltration membrane, a preparation method and a special tool thereof. Background technique [0002] Nanofiltration (NF) membranes first appeared in the late 1970s. It is a pressure-driven membrane between ultrafiltration (UF) membranes and reverse osmosis (RO) membranes. It was once called low-pressure reverse osmosis membranes and loose reverse osmosis membranes. Wait. Nanofiltration membrane is a new type of membrane separation technology that has developed rapidly in the world in recent years. It has two notable characteristics in application: (1) Physical interception or screening effect - it can intercept relative molecular mass of 100-2000, and the molecular size is about 1nm (2) Chargeability - has a certain rejection rate for inorganic salts, wherein the rejection rate for monovalent ions is low (10%-40%), and the rejec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/08
Inventor 杨乾李屹王开宇肖有昌
Owner SUZHOU FAITH HOPE MEMBRANE TECH
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