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Method for preparing hollow fiber molecular sieve membranes in batches

A batch, molecular sieve technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high operation requirements, high mechanization difficulty, low molecular sieve membrane flux, etc. Yield and reduction of tediousness

Active Publication Date: 2012-07-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, processes such as rubbing and rolling have high operational requirements and are difficult to mechanize, and are not suitable for large-scale preparation of hollow fiber molecular sieve membranes.
Chinese patents CN1180877C and CN1274396C introduced the vacuum suction method to coat the seed crystal into the synthesis of the molecular sieve membrane, and used the circulating water pump to suck the seed crystal or the synthetic mother liquor to improve the coating environment of the curved surface, and synthesized the tubular NaA molecular sieve membrane, but the patent Only limited to the preparation of a single molecular sieve membrane, the efficiency is low, and the flux of the prepared molecular sieve membrane is low
Chinese patent CN101746776A discloses a method for preparing hollow fiber NaA molecular sieve membranes by in-situ aging-microwave synthesis. Industrial application is difficult

Method used

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  • Method for preparing hollow fiber molecular sieve membranes in batches
  • Method for preparing hollow fiber molecular sieve membranes in batches
  • Method for preparing hollow fiber molecular sieve membranes in batches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of Hollow Fiber NaA Molecular Sieve Membrane Bundle Assembly by Dipping and Coating Seed Crystals

[0030] Step 1 Prefabrication of hollow fiber bundles

[0031] α-Al 2 o 3 The surface of the hollow fiber support body is polished and polished with SiC sandpaper to make the surface pore diameter uniform, and the rectangular arrangement unit is pre-arranged into clusters (perfect rows). Fiber spacing D is 1d o , the cross-sectional fiber arrangement density is 148,000 / m 2 , the hollow fiber support body is fixed by a prefabricated orifice plate, arranged in a circular shape between the clusters, 80 pieces per cluster; the outer diameter of the hollow fiber ceramic support is d o 2mm, inner diameter d i It is 1mm, the length is 0.25m, the average pore diameter is 0.8μm, and the porosity is 50%.

[0032] Step 2 Seed coating of hollow fiber bundles

[0033] The prefabricated ceramic hollow fiber support is bundled and dried at 120°C, then immerse...

Embodiment 2

[0038] Example 2 Preparation of Hollow Fiber NaA Molecular Sieve Membrane Bundle Assembly by Coating Seed Crystals with Vacuum Suction

[0039] Step 1 Prefabrication of hollow fiber bundles Same as step 1 of embodiment 1

[0040] The hollow fiber supports are pre-regularly arranged into bundles with triangles as their arrangement units. Fiber spacing D is 0.5d o , the cross-sectional fiber arrangement density is 475,000 / m 2 , the hollow fiber support body is fixed by the prefabricated orifice plate, arranged in a circular shape, 95 pieces / cluster; the outer diameter of the hollow fiber ceramic support is d o 1.8mm, inner diameter d i It is 0.9mm, the length is 0.4m, the average pore diameter is 0.6μm, and the porosity is 37%.

[0041] Step 2 Seed coating of hollow fiber bundles

[0042] Saturate the prefabricated fibers with water, and then immerse them in the prepared seed crystal suspension (the seed crystals are crushed by ball milling, the particle size is about 0.3 μ...

Embodiment 3

[0047] Example 3 Preparation of Hollow Fiber NaA Molecular Sieve Membrane Bundle Module by Ultrasonic Coating Seed Crystal

[0048] Step 1 Prefabrication of hollow fiber bundles

[0049] As described in step 1 of embodiment 2, the hollow fiber ceramic support body is regularly bundled, the difference is that the fiber spacing D is 5d o , the fiber arrangement density is 4.7 million / m 2 , 450 / fiber bundle, the hollow fiber ceramic support has an outer diameter of 0.5mm, an inner diameter of 0.1mm, a length of 0.03m, an average pore diameter of 0.35μm, and a porosity of 15%.

[0050] Step 2 Seed coating of hollow fiber bundles

[0051] The prefabricated fiber bundles were saturated with water and placed in the prepared seed crystal suspension. The seed crystals were ball-milled crushed crystal seeds. The particle size of the suspension liquid was 0.3 μm, and the mass fraction of the seed crystals was 5 g / L; The seed crystal suspension was placed in an ultrasonic cleaner for a...

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Abstract

The invention relates to a method for preparing hollow fiber molecular sieve membranes in batches, which is used for scale preparation of molecular sieve membranes supported by a ceramic hollow fiber supporting bodies. The method comprises the following steps: carrying out surface pretreatment on the hollow fiber ceramic supporting bodies and regularly packaging the hollow fiber ceramic supporting bodies into a cluster; coating molecular sieve seed crystal particles on the surfaces of the hollow fiber supporting bodies and drying to obtain a seed crystal hollow fiber cluster; placing the seed crystal hollow fiber cluster into membrane synthetic fluid to carry out hydro-thermal synthesis, washing by deionized water and drying after finishing hydro-thermal synthesis so as to obtain the hollow fiber molecular sieve membrane cluster. The method has the advantages of high mechanical degree, strong maneuverability, high yield and good repeatability and has important significance for industrial production and application popularization of the hollow fiber molecular sieve membranes.

Description

technical field [0001] The invention relates to a batch preparation method of a hollow fiber molecular sieve membrane, which belongs to the field of inorganic membrane preparation. technical background [0002] Pervaporation membrane separation is a new type of membrane separation technology with high efficiency, low energy consumption and simple operation. Pervaporation is to use the difference in the dissolution (adsorption)-diffusion rate of components in the membrane material or the difference in molecular size, to feed the liquid phase on the upstream side of the separation membrane, and to remove the permeated components in the form of steam on the downstream side to realize the composition partition separation. The process is not limited by the vapor-liquid equilibrium of the separation system, and the single-stage separation efficiency is high. It has unique advantages in the separation of azeotropic mixtures, solvent recovery and trace water removal. With the cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/08B01D67/00
Inventor 顾学红何勇王学瑞徐南平
Owner NANJING UNIV OF TECH
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