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A self-supporting ils@cmp film prepared by electropolymerization for improving co 2 /ch 4 method of separating properties

A separation performance and polymer film technology, which is applied in the field of gas membrane separation and ionic liquid membrane separation, can solve the problems of poor stability, game effect, and poor permeability of long-cycle ionic liquids, so as to improve long-cycle stability and separation Performance, effect on enhancing diffusion coefficient and permeate flux

Active Publication Date: 2022-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main types of membranes based on ionic liquids: 1) Supported ionic liquid membranes (SILMs) are based on porous substrates, and their pores are filled with ILs. This type of membrane material has a high CO 2 Selectivity, but there is the problem of poor stability of long-cycle ionic liquids; 2) ionic liquid-polymer composite membranes (ILPMs) embed ILs in the space of polymer chains or clusters, making them stable in the polymer film, It provides a successful method to solve the instability of SILMs, but there is a game effect between the gas permeability and selectivity of ILPMs; 3) Polyionic liquid membranes (PILMs) are composed of polymerizable ionic liquids or ionic liquids with organic It is polymerized from monomers and has the characteristics of both ionic liquids and polymers
However, after immobilizing the ionic liquid, it is easy to cause CO 2 poor permeability

Method used

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  • A self-supporting ils@cmp film prepared by electropolymerization for improving co <sub>2</sub> /ch <sub>4</sub> method of separating properties
  • A self-supporting ils@cmp film prepared by electropolymerization for improving co <sub>2</sub> /ch <sub>4</sub> method of separating properties
  • A self-supporting ils@cmp film prepared by electropolymerization for improving co <sub>2</sub> /ch <sub>4</sub> method of separating properties

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but is not limited thereto.

[0030] In the following examples, the instrument used is as follows:

[0031] Electrochemical workstation, instrument model CHI760E, instrument manufacturer: Shanghai Chenhua. The conditions for this experiment are room temperature, and there is no special treatment before use of solvents and drugs.

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Abstract

The invention relates to a self-supporting ILs@CMP film prepared by electropolymerization for improving CO 2 / CH 4 The method of separation performance belongs to the field of gas membrane separation technology; the method is to use the method of electropolymerization to form a membrane to encapsulate ionic liquid (ILs) in a conjugated microporous polymer film in situ to overcome the long-term cycle stability of the supported ionic liquid membrane Poor performance and low gas permeability of the polyionic liquid membrane; by confining the ionic liquid in the pores of the conjugated microporous polymer (CMP), the long-term cycle stability of the membrane material is improved, ensuring long-term working conditions The ionic liquid will not overflow due to the large gas flow; at the same time, by introducing CO 2 Ionic liquids with strong affinity molecules significantly enhance CO 2 The diffusivity and permeate flux in the membrane improve the CO 2 / CH 4 Separation performance of mixed gases.

Description

technical field [0001] The invention belongs to the field of gas membrane separation. Specifically, it relates to the field of ionic liquid membrane separation. Background technique [0002] Natural gas and shale gas directly developed and exploited in industry contain a large amount of CO 2 Impurity gas (about 40%), high concentration of CO 2 Impurities can greatly reduce the calorific value of combustion of these fuels, and they can corrode equipment pipes during transportation and storage, so they cannot be directly supplied to applications. Compared with traditional physical / chemical adsorption separation, temperature swing pressure swing adsorption separation, cryogenic separation and other separation methods, the advantages of membrane separation are that it can save a lot of energy, the equipment is easy to operate, and it is environmentally friendly. Membranes still have problems such as stability in long-term use, game effects in selectivity and permeability. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/22C10L3/10B01D69/12B01D67/00
CPCB01D53/228C10L3/104B01D69/125B01D67/009Y02C20/40
Inventor 冯霄王博张蒙茜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY