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PIMs ultra-thin layer composite hollow fiber membrane and preparation and application thereof

A fiber membrane and layer composite technology, which is applied in the preparation of ultra-thin polymer membrane materials and the field of gas separation, can solve the problems of uneven ultra-thin layers, and achieve the simple and easy spraying method, small mass transfer coefficient, and uniformity sexual effect

Active Publication Date: 2019-01-22
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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  • PIMs ultra-thin layer composite hollow fiber membrane and preparation and application thereof
  • PIMs ultra-thin layer composite hollow fiber membrane and preparation and application thereof
  • PIMs ultra-thin layer composite hollow fiber membrane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (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;

[0023] (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.

[0024] 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

[0028] 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.

[0029] 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.

[0030] 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

[0032] 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 relates to a PIMs ultra-thin layer composite hollow fiber membrane and an application thereof. The membrane is prepared by spraying PIMs on the surface of a hollow fiber membrane cavity.The PIMs ultra-thin layer composite hollow fiber membrane of an ultra-thin composite layer has a thickness of 45 nm. Compared with the existing methods, the total mass transfer coefficient is small,the mass transfer resistance is small, the membrane surface hydrophobicity is greatly improved, and the competition of alcohol and water molecules on the membrane surface is reduced. A spraying methodof the PIMs ultra-thin layer composite hollow fiber membrane is simple and easy, and the uniformity of a PIMs layer can be ensured under the spray effect, while applied to the gas separation, the adjustability and the ultra-thinness of a PIMs structure generate positive impact on gas separation performance.

Description

(1) Technical field [0001] 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. (2) Background technology [0002] 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 coefficient. The solubi...

Claims

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Application Information

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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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