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Method for preparing hollow fiber carbon membrane through direct wrapping heat treatment, and hollow fiber carbon membrane

A fiber carbon and hollow technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. question

Active Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventionally known preparation methods, in the process of non-melting treatment at relatively low temperature (usually 200-350°C), the hollow shape of the hollow fiber original membrane is damaged due to melting, resulting in various forms of curling, crushing, and fracture. Or the hollow fibers are melted and bonded, etc., neither the hollow fiber membrane with the required length, no deformation, and no damage can be obtained, nor can the carbon membrane with the desired structure and separation performance be obtained.

Method used

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  • Method for preparing hollow fiber carbon membrane through direct wrapping heat treatment, and hollow fiber carbon membrane
  • Method for preparing hollow fiber carbon membrane through direct wrapping heat treatment, and hollow fiber carbon membrane
  • Method for preparing hollow fiber carbon membrane through direct wrapping heat treatment, and hollow fiber carbon membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for preparing a hollow fiber carbon membrane by direct wrapping heat treatment, specifically as follows:

[0052] 1) Configure 18wt% PVDF spinning stock solution, prepare hollow fibers by spinning, and obtain PVDF hollow fibers with an inner / outer diameter of 0.7 / 1.3 mm and a membrane pore size of 0.05 μm, and then use a circulating blower for the PVDF hollow fibers at 80 ° C Dry for 24 hours to obtain the dried hollow fiber original membrane;

[0053] 2) Stretch and stretch the dried hollow fiber original membrane to 110% of the original length by the pull hook method, and then use ablative carbon paper with a thickness of about 0.5 mm to stretch the drawn and extended hollow fiber original membrane, Each fiber is wrapped at an interval of about 5mm (the so-called interval wrapping is to keep a certain distance between the hollow fibers), and then bundled with carbon fiber, wrapped with carbon paper, and fixed with a fixed-length frame to obtain a reinforced o...

Embodiment 2

[0062] A method for preparing a hollow fiber carbon membrane by direct wrapping heat treatment, specifically as follows:

[0063] 1) Dry the commercially available Shandong Jinhui PVDF hollow fiber with mixed hot air at 70°C for 24 hours to obtain the dried hollow fiber original membrane;

[0064] 2) Stretch and stretch the dried hollow fiber original membrane to 105% of the original length with an extensometer, then use a graphite felt with a thickness of about 0.8mm to stretch the hollow fiber original membrane, Each fiber is wrapped at an interval of about 6mm, then wrapped with thin metal (steel) wires, wrapped with carbon paper, and fixed with a non-deformed metal frame, to obtain a reinforced hollow fiber original membrane that is isolated from oxygen and wrapped and drawn;

[0065] 3) Put the strengthened isolated oxygen environment and the hollow fiber original membrane and its wrapper and the fixed frame at 105% magnification together in a high-temperature reaction fu...

Embodiment 3

[0073] A method of directly wrapping heat treatment to prepare hollow fiber carbon membranes. The commercially available polyimide PI hollow fibers are dried at 80° C. for 24 hours with a circulating blower to obtain the dried hollow fiber original membranes; the remaining steps are the same as in the examples 1. Obtain a hollow fiber carbon membrane.

[0074] When the hollow fiber carbon membrane obtained in the example is bent at 180°, the hollow fiber carbon membrane is not broken or damaged, and the corresponding minimum cylinder diameter is ≦80mm.

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Abstract

The invention relates to a method for preparing a hollow fiber carbon membrane through direct wrapping heat treatment, and the hollow fiber carbon membrane. The method comprises the following steps: (1) drying an original hollow fiber membrane; (2) drafting / wrapping the original hollow fiber membrane, and performing heat treatment to obtain a hollow fiber carbon membrane precursor; and (3) performing high-temperature carbonization on the hollow fiber carbon membrane precursor. The method provided by the invention not only solves the problems of curling, cracking or adhesion of hollow fibers, but also combines cross-linking reaction and non-melting treatment, simplifies the combination into thermal stabilization treatment, and can be used for preparing the hollow fiber carbon membrane which is appropriate in length, free of curling deformation, hollow in shape and good in permeation separation performance.

Description

technical field [0001] The invention relates to the field of membranes, in particular to a method for preparing hollow fiber carbon membranes by direct wrapping heat treatment and the hollow fiber carbon membranes. Background technique [0002] The continuous improvement of membrane separation technology and the continuous expansion of application fields have put forward higher requirements for the production of membrane materials. According to different membrane materials, membranes can be divided into polymer membranes, inorganic membranes and metal membranes (polymer membranes are also called organic membranes, or organic polymer membranes), among which polymer membranes are the most widely used, such as microfiltration membranes , ultrafiltration membranes and nanofiltration membranes have been widely used in seawater desalination, food and medicine, etc., but there are also outstanding problems, such as large restrictions on operating pressure and temperature, poor chem...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/08B01D71/02B01D63/02
CPCB01D67/0083B01D69/08B01D71/021B01D63/02Y02A20/131
Inventor 吴历斌王月梅孔德金
Owner CHINA PETROLEUM & CHEM CORP
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