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Polyacrylonitrile-radical hollow carbon-fiber film and preparing method thereof

A polyacrylonitrile-based, carbon fiber membrane technology, applied in the field of membrane separation

Inactive Publication Date: 2003-03-26
TIANJIN MOTIAN MEMBRANE ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to design a liquid-phase hollow carbon fiber membrane and its manufacturing method that can treat polluted environmental wastewater such as printing and dyeing wastewater and oily wastewater, according to the current market and actual needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation process of casting solution: choose dimethylacetamide as solvent, add polyacrylonitrile, its weight ratio to dimethylacetamide is 12:88 (that is, PAN concentration is 12%), then add polymethyl acetamide Methyl acrylate, polyvinylpyrrolidone; polyacrylonitrile, polymethyl methacrylate, and polyvinylpyrrolidone with a weight percentage of 80:10:10, dissolved at 70°C to form a homogeneous casting solution;

[0022] (2) Spinning process: Spin the hollow fiber membrane with the cast membrane solution, water is the coagulation bath, and the spinning temperature is 45°C;

[0023] (3) stretching process: after the spinning process, the hollow fiber membrane spun is stretched, the rotating speed of the godet roller is adjusted, and the stretching ratio is controlled to be 1;

[0024] (4) Post-treatment process: soak the spun hollow fiber membrane for 24 hours with 40% glycerin aqueous solution by weight, then take it out and dry it, and carry out dehydration trea...

Embodiment 2

[0029] (1) Casting solution preparation process: the concentration ratio of PAN in the casting solution is 14.5:85.5; polyimide is added; the weight ratio of polyacrylonitrile, polymethyl methacrylate, polyimide, and polyvinylpyrrolidone is 75: 5: 10: 10, the rest is the same as in Example 1;

[0030] (2) spinning process: with embodiment 1;

[0031] (3) Stretching process: the control draw ratio is 1.5 times, the rest is the same as embodiment 1;

[0032] (4) post-treatment process: with embodiment 1;

[0033] (5) Pre-oxidation process: the heating rate is 5°C / min, the temperature rises from 25°C to 250°C, and is kept for 1 hour; the remainder is the same as in Example 1

[0034] (7) Carbonization process: heat up to 850°C, the heating rate is 10°C / min, keep warm for 1.5 hours, the same as

[0035] Example 1.

[0036] It has been determined that the polyacrylonitrile-based hollow carbon fiber membrane of the present invention has a molecular weight cut-off of 100,000, a p...

Embodiment 3

[0038] (1) Casting solution preparation process: PAN, PMMA, PI, PVP weight percent is 70: 5: 15: 10; PAN concentration ratio is 18: 82, the remainder is the same as embodiment 2;

[0039] (2) spinning process: with embodiment 1;

[0040] (3) stretching process: the control stretching ratio is 3, the rest is the same as embodiment 1;

[0041] (4) post-treatment process: with embodiment 1;

[0042] (5) Pre-oxidation process: the heating rate is 8°C / min, the temperature rises from 25°C to 300°C, and the temperature is kept for 0.5 hours, the remainder is the same as in Example 1;

[0043] (6) Carbonization process: the temperature was raised to 750° C., the heating rate was 10° C. / min, and the temperature was kept for 3 hours. The remainder was the same as in Example 2.

[0044] It has been determined that the polyacrylonitrile-based hollow carbon fiber membrane of the present invention has a molecular weight cut-off of 150,000, a porosity of 60%, and a flux of 160 l / m at an op...

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PUM

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Abstract

The present invention relates to a polyacrylonitrile-based hollow carbon fibre membrane and its production method. The composition of said membrane formula is (wt%) 70-80% of polyacrylonitrile, 5-15% of methyl methacrylate and 5-15% of polyvinylpyrrolidone, and its production method includes the membrane-casting liquor preparation process, spinning process, stretching process, after-treatment process, preoxidation process and carbonizing process, and it is characterized by that the temp. of proxidation process is 240-300 deg.C, temp.-rising speed is 2-8 deg.C / min, heat-insulating time is 0.5-2 hr, then continuously temp.-rising to make carbonizing process, carbonizing temp. is 750-1000 deg.C, temp.-rising speed is 8-15 deg.c / min, heat-insulating time is 1-3 hr.

Description

(1) Technical field [0001] The invention relates to membrane separation technology, specifically polyacrylonitrile-based hollow carbon fiber membrane and its manufacturing method technology, and the main classification number of the international patent is intended to be Int.Cl 7 .BOID71 / 00. (2) Background technology [0002] Membrane separation technology is a new separation technology, which has developed rapidly in recent decades and has been widely used in many fields, and its application fields are constantly expanding. According to the membrane form, it can be divided into flat membrane, tubular membrane, roll membrane and hollow fiber membrane. Among them, hollow fiber membranes are widely used because of their high packing density, simple processing, and miniaturized equipment. According to the membrane material, it can be divided into inorganic membrane, organic membrane and special carbon material membrane. Among them, organic membranes are the most widely used,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/00
Inventor 刘恩华杜启云程博闻范云双李树锋
Owner TIANJIN MOTIAN MEMBRANE ENG & TECH
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