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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: 2010-02-10
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 selective separation of the outer skin layer and the mechanical support inner layer; among them, the upper left is the outer surface of the selective separation of the outer skin, and the upper right is the selective separation of the outer skin The lower left position mechanically supports the outer surface of the inner layer, and the lower right position mechanically supports the inner surface of the inner layer. There are membrane pores on the selective separation skin layer, the membrane pore diameter is 0.5-2 nanometers; the thickness of the selective separation skin layer is 10-10000 nanometers; the thickness of the mechanical support inner layer is 1-3 mm; the double-layer composite hollow fiber nanofiltration membrane The selective separation of the outer skin layer and the mechanical support inner layer are respectively di...

Embodiment 2

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

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

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

[0060] The hollow fiber nanofiltration membrane module made of these filaments has a rejection rate of 15% for 1 mM / L sodium chloride under an operating pressure of 1 kg and an external pressure operation mode, and a rejection rate of 80% for 1 mM / L magnesium chloride; The rejection rates for 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 those in Example 1. The selected ratio and process conditions are shown in Table 3. The SPES-PAN double-layer composite hollow fiber nanofiltration membrane was prepared.

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

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

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

[0066] The hollow fiber nanofiltration membrane module made of these filaments has a rejection rate of 10% for 1 mM / L sodium chloride and 82% for 1 mM / L magnesium chloride under 1 kg operating pressure and external pressure operation mode; The rejection rates for 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 and a preparation method and special tools thereof. Background technique [0002] Nanofiltration (NF) membrane first appeared in the late 1970s. It is a pressure-driven membrane between ultrafiltration (UF) membrane and reverse osmosis (RO) membrane. It was once called low-pressure reverse osmosis membrane and loose reverse osmosis membrane. 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 retention or sieving effect-the relative molecular mass can be intercepted 100-2000, and the molecular size is about 1nm (2) Chargeability-a certain rejection rate for inorganic salts, of which the rejection rate for monovalent ions is lower (10%-40%), and the rejection rate for d...

Claims

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Application Information

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Patent Type & Authority Applications(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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