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A kind of pims ultra-thin layer composite hollow fiber membrane and its preparation and application

A fiber membrane and layer composite technology, which is applied in the field of ultra-thin polymer membrane material preparation and gas separation, can solve the problem that the ultra-thin layer will not be uniform, and achieve a simple and easy spray method, small mass transfer coefficient, and hydrophobicity. improved effect

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating method often encounters a problem that in the coating process, if certain measures are not taken, the ultra-thin layer will often not be uniform, especially at the nanometer level, and certain measures need to be taken to control the coating process.

Method used

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  • A kind of pims ultra-thin layer composite hollow fiber membrane and its preparation and application
  • A kind of pims ultra-thin layer composite hollow fiber membrane and its preparation and application
  • A kind of pims ultra-thin layer composite hollow fiber membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Cut the PAN organic hollow fiber membrane with a length of 25 cm and an inner diameter of 2.5 mm (purchased from Shandong Jinhui Membrane Technology Co., Ltd.), wash it with room temperature ultrasonic (50-100 Hz) deionized water for 50 min, remove impurities, and dry it in a fume hood. Prepare the hollow fiber membrane after cleaning;

[0028] (2) if figure 2 As shown, the hollow fiber membrane tubular module consists of a hollow fiber membrane bundle containing a plurality of hollow fiber membranes, a housing (16 cm, glass cylinder) for accommodating the hollow fiber membrane bundle, and bonding the two ends of the hollow fiber membrane bundle It is composed of an adhesive fixing layer fixed on the casing, a fluid inlet and outlet arranged on the casing, and a gas spray head arranged at both ends of the casing.

[0029] Select 8 cleaned hollow fiber membranes, use a small amount of epoxy resin AB glue (purchased from Shenzhen Tegu New Material Co., Ltd.) to plug...

Embodiment 2

[0033] Change the PAN hollow fiber membrane in Example 1 to PVDF hollow fiber membrane, spray 2wt% PIM-1 solution, other operations are the same as in Example 1, and use the obtained PIM-1 / PVDF composite membrane for a single gas H 2 , CO 2 , N 2 、C 3 h 6 and C 3 h 8 Flux measurement, the gas separation performance of the membrane was calculated by a single gas flux, and the results are shown in Table 1.

[0034] Under the same conditions, the PAN hollow fiber membrane in Example 1 was changed to an aminated PVDF hollow fiber membrane, and 2wt% PIM-1 solution was sprayed. Other operations were the same as in Example 1. The results are shown in Table 1.

[0035] The aminated PVDF hollow fiber membrane is prepared as follows: the PVDF hollow fiber membrane is cleaned with ultrasonic deionized water at room temperature and 50-100 Hz for 50 minutes to remove impurities, dried in a fume hood, and immersed in a 20% aqueous solution of ethylenediamine , amination reaction at 80...

Embodiment 3

[0037] Weigh 0.5g of PIM-1 powder into 30ml of 20% NaOH dope, the solvent is ethanol / water mixture with a volume ratio of 1:1, react at 120°C for 10h, filter it out once, and use the filter cake with a pH value of 4 -5 hydrochloric acid aqueous solution (2mol / L) reacted at 100°C for 1-2h, filtered twice, washed the second filter cake with water for 3-4 times, and vacuum dried at 120°C for 5h and 10h respectively to obtain carboxyl groups of different degrees C-PIM-1 (i.e. C-PIM-1 powder). Replace the PIM-1 powder in Example 1 with different degrees of carboxylated C-PIM-1 powder, change the PAN hollow fiber membrane in Example 1 into an aminated PVDF hollow fiber membrane, and spray 2wt% of C-PIM- 1 solution, other operations are with embodiment 1, obtains C-PIM-1 / PVDF composite membrane, is used for single gas H 2 , CO 2 , N 2 、C 3 h 6 and C 3 h 8 Flux measurement, the gas separation performance of the membrane was calculated by a single gas flux, and the results are s...

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Abstract

The invention discloses a PIMs ultra-thin layer composite hollow fiber membrane and its application. The membrane is made by spraying PIMs on the inner cavity surface of the hollow fiber membrane. The invention can prepare the PIMs ultra-thin layer composite hollow fiber membrane with ultra-thin composite layer, the thickness is 45nm, compared with the existing method, its total mass transfer coefficient is small, and the mass transfer resistance is small; the hydrophobicity of the membrane surface is greatly improved, reducing Competition of alcohol and water molecules on the surface of small membranes. The spraying method of the PIMs ultra-thin layer composite hollow fiber membrane of the present invention is simple and easy, and the uniformity of the PIMs layer can be guaranteed under the spraying action, and when it is applied to gas separation, the adjustability and ultrathinness of the PIMs structure will be reduced. Positive impact on gas separation performance.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of preparation of an ultra-thin polymer membrane material and gas separation, in particular to the preparation of an ultra-thin self-porous polymer PIMs layer composite membrane and the application of a gas separation membrane. [0003] (2) Background technology [0004] In recent years, self-porous polymers (PIMs) have been widely used in various membrane fields due to their high specific surface area, good physical and chemical stability and solution processability, such as gas separation, pervaporation, and organic solvent nanomaterials. filter. Especially in the field of gas separation, PIMs gas separation membranes have made a better breakthrough. We know that the model followed by the gas passing through the polymer membrane is the dissolution-diffusion model, so the gas separation performance of the polymer membrane is affected by both the dissolution coefficient and the diffusion coefficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D69/12B01D67/00B01D63/02B01D53/22
CPCB01D53/228B01D63/02B01D63/021B01D67/0002B01D69/08B01D69/12B01D69/122
Inventor 张国亮张军徐泽海鲁江峰孟琴
Owner ZHEJIANG UNIV OF TECH
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