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Porous metal hollow fibrous membrane and preparation method

A porous metal and fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult control of operating conditions, complicated preparation process, low packing density, etc., and achieve brittleness, separation The effect of high efficiency and high packing density

Inactive Publication Date: 2014-03-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on this material is limited to sheet membranes and tubular membranes. The Chinese patent application number 200410003039.5 discloses a method of powder reaction synthesis to prepare titanium-aluminum intermetallic compounds for filtration, which is formed by molding and cold isostatic pressing. Method The powder is made into flakes and tube blanks, and the titanium-aluminum alloy film is prepared by low-temperature pre-reaction and high-temperature short-time reaction sintering. This method is complicated in preparation process, difficult to control the operating conditions and obtains a tubular film with low packing density.

Method used

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  • Porous metal hollow fibrous membrane and preparation method
  • Porous metal hollow fibrous membrane and preparation method
  • Porous metal hollow fibrous membrane and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Stainless steel powder (316L, d 50 =15μm), 1-methyl-2-pyrrolidone (NMP), polyethersulfone (PES) and water (H 2 O) According to the mass ratio of 0.68:0.2:0.1:0.02, stir continuously and mix evenly. After vacuum defoaming, it is driven by 0.1MPa nitrogen pressure and controlled by a metering pump (25r / min). The 15cm air gap enters the tap water (15°C) tank, deionized water (15°C) is used as the internal coagulation bath, and the flow rate of the internal coagulation bath is controlled at 10ml / min. The obtained hollow fiber body was soaked in water to remove the solvent NMP. After natural air drying, it was sintered under high-purity nitrogen atmosphere. Control the heating rate at 1°C / min to 600°C, hold for 60 minutes, then heat at a rate of 3°C / min to 1050°C, hold for 60 minutes, and finally cool down to room temperature naturally to obtain a porous stainless steel hollow fiber membrane.

[0027] The hollow fiber membrane prepared by the above process has good tough...

Embodiment 2

[0029] Stainless steel powder (316L, d 50 =6μm), 1-methyl-2-pyrrolidone (NMP), polyethersulfone (PES) and polyvinylpyrrolidone (PVP) according to 0.8:0.15:0.04:0.01. After vacuum defoaming, push the air pressure of 0.15MPa to control the extrusion flow rate of 5ml / min through the metering pump (20r / min). The 10cm air gap enters the tap water (20°C) tank, and the deionized water (20°C) is used as the internal coagulation bath, and its flow rate is controlled at 20ml / min. The obtained hollow fiber body was soaked in water to remove the solvent NMP. After natural air drying, it was sintered under hydrogen atmosphere. Control the heating rate at 3°C / min to 400°C, hold for 120 minutes, then heat to 1150°C at a heating rate of 1°C / min, hold for 120 minutes, and naturally cool to room temperature to obtain a porous stainless steel hollow fiber membrane.

[0030] The outer diameter of the hollow fiber membrane prepared by the above process is 2 mm, the wall thickness is 0.35 mm, an...

Embodiment 3

[0032] Stainless steel powder (316L, d 50=8μm), 1-methyl-2-pyrrolidone (NMP), polyethersulfone (PES) according to the mass ratio of 0.85:0.12:0.03 continuous stirring and mixing. After vacuum defoaming, it is propelled by 0.25MPa nitrogen pressure, and the extrusion flow rate is controlled by a metering pump (5r / min) to 2ml / min, and the hollow fiber blank is extruded from the spinning head (inner diameter / outer diameter is 0.5mm / 1.8mm). The 5cm air gap enters the tap water (25°C) tank, deionized water (25°C) is used as the internal coagulation bath, and its flow rate is controlled at 30ml / min. The obtained hollow fiber body was soaked in water to remove the solvent NMP. After natural air drying, it was sintered in a helium atmosphere. Control the heating rate at 2°C / min to 400°C, hold for 120 minutes, then heat to 1300°C at a rate of 2°C / min, hold for 120 minutes, and finally cool down to room temperature naturally to obtain a porous stainless steel hollow fiber membrane.

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Abstract

The invention relates to a porous metal hollow fibrous membrane and a preparation method. The porous metal hollow fibrous membrane is characterized in that the outer diameter is 2+ / -0.5 mm, the wall thickness is 0.2-0.6 mm, and the porosity is 15-45 percent; the porous metal hollow fibrous membrane is made of a porous stainless steel hollow fibrous membrane or a porous titanium-aluminum alloy hollow fibrous membrane. The preparation method comprises the steps of uniformly stirring and mixing metal powder, 1-methyl-2-pyrrolidone (NMP), polyether sulfone (PES) and water (H2O) according to a certain mass ratio to prepare a spinning solution; and preparing a hollow fiber green body by a dry / wet spinning method; performing high-temperature roasting under protective atmosphere to obtain the porous metal hollow fibrous membrane. The preparation method disclosed by the invention is simple in operation technology, and the prepared porous metal hollow fibrous membrane is high in bending strength, high in flexibility, high in heat conduction performance and heat stability, high in filling density and high in permeation flux and has wide application prospects and great market potential.

Description

technical field [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, in particular to a high-strength, tough porous metal hollow fiber membrane and a preparation method thereof. Background technique [0002] Hollow fiber membranes are self-supporting asymmetric membranes with high packing density and good permeability, and the preparation process is simple, which can significantly reduce the volume of membrane equipment and production costs. Inorganic ceramic hollow fiber membranes have attracted widespread attention because of their high temperature resistance, high pressure resistance and strong corrosion resistance. However, this type of membrane material also has problems such as low strength, poor toughness, and easy fracture, which restricts the industrial application process of hollow fiber membranes. [0003] Compared with the earlier developed organic membranes and traditional inorganic ceramic membranes, porous metal membranes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/08B01D67/00
Inventor 顾学红芮文洁时振洲王学瑞
Owner NANJING UNIV OF TECH
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