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Preparation and application of an ionic liquid blend membrane

An ionic liquid and blended membrane technology, applied in membrane technology, separation method, semi-permeable membrane separation, etc., can solve the problems of easy loss of ionic liquid and poor mechanical stability, and achieve excellent comprehensive performance, low loss rate, and preparation method. simple effect

Inactive Publication Date: 2019-01-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ionic liquid membrane is mainly prepared as a supporting liquid membrane, and its mechanical stability is poor, especially under high pressure conditions, the ionic liquid is easy to lose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, the preparation of a kind of ionic liquid blend membrane, comprises the following steps:

[0015] Step 1. Weigh 0.5g of polyoxyethylene-polycaprolactam block copolymer (trade name: Pebax 1657), 7g of absolute ethanol and 3g of deionized water, add in a three-necked flask with a condenser, and place in a constant temperature water bath at 80°C , reflux and stir at a speed of 500r / min for 2h to dissolve all the polyoxyethylene-polycaprolactam block copolymers therein.

[0016] Step 2. Weigh 0.25g of 1-butyl-2,3-dimethylimidazolium hexafluorophosphate, and add it dropwise to the polyoxyethylene-polycaprolactam block copolymer solution prepared in step 1, at 1000r / min Stir magnetically at a high speed for 2 hours, and cool to room temperature to prepare a casting solution;

[0017] Step 3: Put the casting liquid on a clean PTFE petri dish (Φ100mm) after standing for defoaming, and dry it at room temperature for 24 hours to solidify into a film, then dry it at...

Embodiment 2

[0019] Example 2, the preparation of an ionic liquid blend membrane, the preparation process is basically the same as that of Example 1, the difference is: the quality of 1-butyl-2,3-dimethylimidazolium hexafluorophosphate in step 2 0.025g.

[0020] The test conditions are the same as in Example 1, with pure gas tested under humidified conditions, CO 2 The permeability coefficient is 484barrer (1barrer=10 -10 cm 3 (STP)cm / (cm 2 s cmHg)), CO 2 / N 2 Separation factor is 26, CO 2 / CH 4 The separation factor was 22.

Embodiment 3

[0021] Example 3, the preparation of an ionic liquid blend membrane, the preparation process is basically the same as in Example 1, the difference is: the quality of 1-butyl-2,3-dimethylimidazolium hexafluorophosphate in step 2 0.10g.

[0022] The test conditions are the same as in Example 1, with pure gas tested under humidified conditions, CO 2 The permeability coefficient is 580barrer (1barrer=10 -10 cm 3 (STP)cm / (cm 2 s cmHg)), CO 2 / N 2 Separation factor is 31, CO 2 / CH 4 The separation factor was 33.

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Abstract

The invention discloses a preparation method and application of an ionic liquid blended membrane and belongs to the technical field of gas separating membranes.The preparation method includes: preparing a polyoxyethylene-polycaprolactam segmented copolymer solution, and adding imidazole type room-temperature ionic liquid into the solution to obtain membrane casting liquid; drying at room temperature, and further drying under a vacuum condition to obtain the ionic liquid blended membrane.The preparation method and the application have the advantages that the preparation method is simple, and the ionic liquid is fixed in macromolecular chains, thereby being low in loss rate; the composite membrane prepared by the method has excellent comprehensive performance when being used for gas separation; especially, the blanded membrane filled with 1-butyl-2, 3-dimethyl imidazole hexafluorophosphate of 40% in mass percentage has high CO2 seepage velocity and CO2 / CH4 and CO2 / N2 selectivity, CO2 seepage coefficient in a pure gas test under a humidifying condition can reach 695 Barrer, CO2 / CH4 selectivity is 35, and CO2 / N4 selectivity is 42.

Description

technical field [0001] The invention relates to the preparation and application of an ionic liquid blend membrane, and belongs to the technical field of gas membrane separation. Background technique [0002] In recent years, with the development of industry, the combustion of fossil fuels has produced a large amount of CO 2 gas. There is an urgent need for efficient and low-cost carbon capture technologies. Membrane technology has attracted widespread attention due to its advantages of greenness, low energy consumption, and low equipment investment, and is one of the technologies expected to be adopted on a large scale. At present, due to the low separation performance of membrane materials, its further development is limited. Designing and preparing membrane materials with high permeability and high selectivity is a hot research topic at present. Traditional polymer materials have good film-forming properties and low cost, and are the main body of film materials. Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D69/12B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D69/12B01D71/80Y02C20/40
Inventor 姜忠义王少飞于晓苏任燕雄吴星宇
Owner TIANJIN UNIV
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