Preparation and application of polyimide-imidazole micro-capsule hybrid membrane

A polyimide, imidazole microcapsule technology, applied in the direction of separation through membrane, membrane technology, semi-permeable membrane, etc., can solve the problem of gas separation that has not been reported in the literature, achieve excellent water retention performance, improve permeation flux, increase The effect of a large free volume

Inactive Publication Date: 2014-01-29
TIANJIN UNIV
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Problems solved by technology

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  • Preparation and application of polyimide-imidazole micro-capsule hybrid membrane
  • Preparation and application of polyimide-imidazole micro-capsule hybrid membrane
  • Preparation and application of polyimide-imidazole micro-capsule hybrid membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation of Modified Silica Particles:

[0022] At a temperature of 30°C, disperse 3g of monodispersed silicon dioxide particles with a diameter of about 200nm into a solution containing 200ml of ethanol, 20ml of water, and 6ml of ammonia water, and then add 1ml of 3-(trimethyl Oxysilyl)propyl-2-methyl-2-acrylate (MPS) and stirred for 4 h, then centrifuged, washed with ethanol and water, and dried to obtain modified silica particles;

[0023] Preparation of imidazole microcapsules:

[0024] Take 0.3 g of the modified silicon dioxide particles and disperse them in 80 ml of acetonitrile for dispersing, and ultrasonically disperse for 2-4 hours to obtain a uniformly dispersed suspension. Then add 0.018g initiator 2,2'-azobisisobutyronitrile (AIBN) to the suspension and ultrasonically disperse for 5-10 minutes, then add 0.45ml reactive monomer vinylimidazole (VI) and 0.45ml cross-linking agent ethylene glycol dimethacrylate (EGDMA) and ultrasonic dispersion for 5-10 m...

Embodiment 2

[0028] The process and conditions of this embodiment are the same as in Example 1, except that the amount of imidazole microcapsules added to the polyimide solution with a mass concentration of 6% is changed from 0.012g to 0.03g, and the prepared polyimide The carbon dioxide permeation flux of the imine-imidazole microcapsule hybrid membrane is 163.3×10 -10 cm 3 (STP) cm / (cm 2 s cmHg), CO 2 / CH 4 The selectivity is 31.3.

Embodiment 3

[0030] The process and conditions of this embodiment are the same as in Example 1, except that the amount of imidazole microcapsules added to the polyimide solution with a mass concentration of 6% is changed from 0.012g to 0.06g, and the prepared polyimide The carbon dioxide permeation flux of the imine-imidazole microcapsule hybrid membrane is 220.5×10 -10 cm 3 (STP) cm / (cm 2 s cmHg), CO 2 / CH 4 The selectivity is 30.2.

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Abstract

The invention discloses preparation and application of a polyimide-imidazole micro-capsule hybrid membrane. The preparation comprises the following process steps of: preparing silicon dioxide balls, preparing imidazole micro-capsules, filling the imidazole micro-capsules in a polyimide solution to obtain a membrane casting solution, standing, filtering and defoaming the membrane casting solution, and then carrying out curtain coating, drying and annealing to form a membrane. The hybrid membrane is used as a separation membrane for removing carbon dioxide gas out of natural gas. The polyimide-imidazole micro-capsule hybrid membrane has the advantages that the preparation method is simple, the nano-scale imidazole micro-capsules in the prepared membrane are distributed evenly, the addition of the imidazole micro-capsules greatly promotes transfer of carbon dioxide in the membrane, the hybrid membrane has high carbon dioxide permeation flux and carbon dioxide-to-methane selectivity, and the hybrid membrane also has excellent mechanical stability and thermal stability.

Description

technical field [0001] The invention relates to the preparation and application of a polyimide-imidazole microcapsule hybrid membrane, which belongs to the organic-organic hybrid membrane gas separation membrane technology. Background technique [0002] With the severe consumption of non-renewable resource petroleum, finding renewable alternative energy has increasingly become one of the urgent problems for the majority of energy researchers. As a renewable resource with a wide range of sources, biogas resources have received extensive attention, and the large-scale application of biogas resources lies in how to effectively remove the CO 2 . As a separation technology with simple process, high efficiency, low energy consumption and low pollution, gas membrane separation has become one of the separation technologies with broad development prospects. At present, organic polymer membrane materials used for gas separation can be divided into five categories: polyimide, PEO, si...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D67/00B01D53/22C08F292/00C08F226/06C08F222/14
CPCY02C10/10Y02C20/40Y02P20/151
Inventor 吴洪芦霞姜忠义
Owner TIANJIN UNIV
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