Gas dehumidification film, preparation method and application thereof

A gas and wet membrane technology, applied in the field of gas dehumidification membrane and its preparation, can solve the problem of low water selectivity and so on

Inactive Publication Date: 2021-05-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PDMS is a hydrophobic polymer, the selectivity of water is not high, so it is only suitable for dehumidification occasions with high humidity

Method used

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  • Gas dehumidification film, preparation method and application thereof

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Embodiment 1

[0029] In this embodiment, a gas dehumidification membrane is provided. The raw materials for the preparation of the gas dehumidification membrane include polyether-b-polyamide (Pebax1074) and sodium hyaluronate, and the mass ratio of Pebax1074 and sodium hyaluronate is 3 :7. Among them, Pebax1074 is a block copolymer.

[0030] The preparation method comprises the following steps:

[0031] Dissolve the vacuum-dried Pebax1074 in ethanol and water with a mass ratio of 7:3, the dissolution temperature is 100°C, and stir until uniform and transparent to prepare a Pebax1074 solution with a mass concentration of 0.1%, and add sodium hyaluronate to the Pebax1074 solution , Stir again until uniform and transparent, let it stand for defoaming, pour the defoamed solution on the tetrafluoro board and spread evenly, keep the temperature of the tetrafluoro board at 40°C, and volatilize the solvent to obtain the primary film, and then remove the primary film from Carefully remove the PTFE...

Embodiment 2

[0033] In this embodiment, a gas dehumidification membrane is provided. The raw materials for the preparation of the gas dehumidification membrane include polyether-b-polyamide (Pebax1074) and sodium hyaluronate, and the mass ratio of Pebax1074 and sodium hyaluronate is 1. :1. Among them, Pebax1074 is a block copolymer.

[0034] The preparation method comprises the following steps:

[0035] Dissolve the vacuum-dried Pebax1074 in ethanol and water with a mass ratio of 7:3, the dissolution temperature is 90°C, and stir until uniform and transparent to prepare a Pebax1074 solution with a mass concentration of 20%, and add sodium hyaluronate to the Pebax1074 solution , stirred again until uniform and transparent, degassed under negative pressure, poured the defoamed solution on the flat filter membrane and spread it evenly, kept the temperature of the flat filter membrane at 50°C, and volatilized the solvent to obtain a nascent membrane, and then the nascent membrane was removed ...

Embodiment 3

[0037] In this embodiment, a gas dehumidification membrane is provided, and the preparation raw materials of the gas dehumidification membrane include polyether-b-polyamide (Pebax4011) and lithium chloride, and the mass ratio of Pebax4011 and lithium chloride is 9:1 . Among them, Pebax4011 is a block copolymer.

[0038] The preparation method comprises the following steps:

[0039]Dissolve the vacuum-dried Pebax4011 in ethanol and water with a mass ratio of 7:3, the dissolving temperature is 70°C, and stir until uniform and transparent to prepare a Pebax4011 solution with a mass concentration of 0.5%. Add lithium chloride to the Pebax4011 solution, Stir again until uniform and transparent, let it stand for defoaming, pour the defoamed solution on a glass plate and spread evenly, keep the temperature of the glass plate at 60°C, and volatilize the solvent to obtain a primary film, and then remove the primary film from the glass plate Take it off carefully, put it in a vacuum o...

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Abstract

The invention provides a gas dehumidification membrane, a preparation method and application thereof. The gas dehumidification membrane is prepared from polyether-b-polyamide and a hydrophilic electrolyte, wherein the mass ratio of the polyether-b-polyamide to the hydrophilic electrolyte is 3:7-9:1, the polyether-b-polyamide is a block copolymer, and the hydrophilic electrolyte comprises an organic electrolyte sodium salt and/or a hydrophilic inorganic salt. According to the invention, the gas dehumidification membrane prepared by compounding the hydrophilic electrolyte and the polyether-b-polyamide is high in permeability, good in gas selectivity, good in stability, capable of preferentially permeating water vapor, high in water vapor separation performance, mild in operation condition, easy to repeat, beneficial to industrialization and suitable for industrial production, and can be applied to dehumidification of gases such as air, nitrogen, hydrogen, natural gas, synthesis gas or pyrolysis gas and the like.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, and relates to a gas dehumidification membrane and its preparation method and application. Background technique [0002] Air humidity is one of the important environmental parameters closely related to people's life and production. How to control humidity is of great significance to improving living conditions, developing production technology, ensuring production technology, and improving product quality. At present, the commonly used air dehumidification methods include cooling dehumidification, solid adsorbent dehumidification, and wheel dehumidification. Although these traditional dehumidification methods are widely used, they still have disadvantages such as low dehumidification efficiency, complicated equipment, and secondary pollution. [0003] Membrane gas dehumidification is a promising and attractive high-tech, with unique advantages such as small footprint, flexible o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D69/02B01D67/00B01D53/26
CPCB01D71/80B01D69/02B01D67/0002B01D53/268
Inventor 冯世超万印华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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