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A preparation method of poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane

A technology of polym-phenylene isophthalamide and nanofiltration membrane, which is applied in the field of membrane separation

Inactive Publication Date: 2013-01-02
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many patents on the preparation of membranes from aromatic polyamide polymers, but most of them are composite reverse osmosis membranes, composite nanofiltration membranes or porous membranes. The preparation of hollow fiber nanofiltration membrane technology by phase inversion method has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take by weighing 270g fully dried polym-phenylene isophthalamide, 870g dimethylacetamide, lithium chloride of 72g, polyethylene glycol of 60g, mix in hollow fiber membrane spinning machine feed tank, Set the dissolving temperature to 85°C. After the polymer is completely soaked in the solvent, start stirring to completely dissolve the mixture to form a homogeneous mixture. Let it stand still and perform vacuum degassing at 50°C before spinning. The length of the drying tunnel is 20cm. Set The temperature of the drying tunnel is 100°C, the core liquid and the gel bath are both deionized water at 25°C, the outer diameter of the obtained hollow fiber nanofiltration membrane is 1.30mm, the inner diameter is 0.80mm; the pore size distribution is about 22nm; the elongation at break 89% tensile strength, 12.54MPa tensile strength; 2 SO 4 Aqueous solution is used as the research object, and the water flux can reach 52L / m 2 h, for Na 2 SO 4 The rejection rate reaches 67%.

Embodiment 2

[0020] Take by weighing 300g fully dried polym-phenylene isophthalamide, 915g dimethylacetamide, lithium chloride of 75g, polyvinylpyrrolidone of 50g, mix in hollow fiber membrane spinning machine feed tank, set Set the dissolution temperature at 85°C. After the polymer is completely soaked in the solvent, start stirring to completely dissolve the mixture to form a homogeneous mixture. After standing still, vacuum defoaming is carried out at 50°C and then spinning. The length of the drying tunnel is 30cm. The channel temperature is 120°C, the core fluid and gel bath are both deionized water at 25°C, the outer diameter of the obtained hollow fiber nanofiltration membrane is 1.30mm, the inner diameter is 0.80mm; the pore size distribution is about 14nm; the elongation at break 96%, tensile strength 9.76MPa; 25 ℃, 0.5MPa operating pressure, with 500mg / L Na 2 SO 4 Aqueous solution is used as the research object, and the water flux can reach 43L / m 2 h, for Na 2 SO 4 The rejecti...

Embodiment 3

[0022] Take by weighing 330g fully dried polym-phenylene isophthalamide, 935g dimethylacetamide, lithium chloride of 75g, polyvinylpyrrolidone of 52g, mix in hollow fiber membrane spinning machine feed tank, set Set the dissolution temperature at 85°C. After the polymer is completely soaked in the solvent, start stirring to completely dissolve the mixture to form a homogeneous mixture. After standing still, perform vacuum degassing at 50°C and then spin. The length of the drying tunnel is 40cm. The channel temperature is 140°C, and the core fluid and gel bath are both deionized water at 25°C. The outer diameter of the obtained hollow fiber nanofiltration membrane is 1.30mm, and the inner diameter is 0.80mm; the pore size distribution is about 7nm; the elongation at break 101.5%, tensile strength 8.34MPa; 25 ℃, 0.5MPa operating pressure, with 500mg / L Na 2 SO 4 Aqueous solution is used as the research object, and the water flux can reach 32L / m 2 h, for Na 2 SO 4 The rejectio...

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Abstract

The invention relates to a preparation method of poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane. Poly(m-phenylene isophthalamide) is adopted as raw material, sufficiently mixed with organic solvent and additive, to obtain homogeneous spinning stock solution, the spinning stock solution is prepared into the hollow fiber nanofiltration membrane by use of immersion precipitation phase inversion method. In the spinning stock solution, the content of the poly(m-phenylene isophthalamide) is of 10%-25%, the content of the organic solvent is of 50%-70%, and the content of the additive is of 8%-25%. The prepared hollow fiber nanofiltration membrane has the outside diameter of 0.8-2.5mm, the inside diameter of 0.5-2.0mm, the pore size distributed in 2-30 nm, the tensile strength up to 8-15 MPa, and the breaking elongation in the range of 90%-160%. At 25 DEG C., under the operating pressure of 0.5 MPa, in the membrane treatment experimental study with 500 mg / L Na2SO4 water solution as study system, the water flux is up to 32-85 L / m2.h, and the interception rate for Na2SO4 is up to 50%-95%. The process is easy to operate, the film-forming process is simple, and the membrane has excellent mechanical property, high water flux, and wide application prospects.

Description

technical field [0001] The invention relates to a membrane separation technology, in particular to a process for preparing a polym-phenylene isophthalamide hollow fiber nanofiltration membrane by means of an immersion precipitation phase inversion method. Background technique [0002] As one of the high-tech in the 21st century, membrane separation technology has outstanding advantages such as high separation efficiency, low energy consumption (no phase change), no pollution to the environment, and easy integration with other technologies compared with traditional separation technologies. In today's world where energy and water resources are in short supply and water and environmental pollution are becoming more and more serious, the research on membrane separation science and technology has been highly valued by countries all over the world. In the development process of nearly 30 years, it has been widely used in petrochemical, electronic and other fields, and formed an in...

Claims

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Application Information

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IPC IPC(8): B01D71/40B01D69/08B01D67/00
Inventor 栾兆坤王涛赵长伟贾智萍王军侯得印
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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