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Membrane module of using compact polymer membrane in application for separating gas mixture

A technology of polymer membranes and membrane modules, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of small effective area, low absorption efficiency, high cost, etc., and achieve liquid phase mass transfer with small resistance, The effect of large absorption driving force and high penetration rate

Inactive Publication Date: 2006-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the adsorption method, the capacity of the adsorbent is limited and the degree of automation is high; the low-temperature distillation method has high energy consumption and poor separation effect; traditional gas absorption devices such as packed towers and degassers have played an important role in industrial applications in recent decades. important role, but they are bulky, costly, and operating conditions are limited, and their mass transfer area is usually 20 to 500m 2 / m 3 , the flow rate is small, there is a dry contact surface, the actual effective area is small, the absorption efficiency is low, and it needs to be operated under a relatively large air flow and a stable state, it is difficult to control the gas and liquid flow rates, and they have a prominent disadvantage: the two-phase fluid in contact There is mutual influence between them, which often leads to mist entrainment, liquid flooding, liquid leakage and other problems
Compared with traditional methods, this type of method has a higher specific surface area, and has the advantages of small pressure drop on both sides of the gas and liquid, and fast mass transfer rate; To prevent bubbling on the liquid side; at the same time, the pressure difference between the liquid phase and the gas phase should not be greater than the breakthrough pressure, which will limit the pressure operating range of the gas-liquid two-phase; and studies have found that long-term operation will lead to partial wetting of the absorbent or Wetting membrane pores, thereby reducing breakthrough pressure

Method used

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  • Membrane module of using compact polymer membrane in application for separating gas mixture
  • Membrane module of using compact polymer membrane in application for separating gas mixture
  • Membrane module of using compact polymer membrane in application for separating gas mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use water, alcohol amine aqueous solution (monoethanolamine / MEA, diethanolamine / DEA, triethanolamine / TEA), NaOH aqueous solution, etc. as the absorption liquid to absorb and remove CO 2 , the absorption liquid concentration is 2M, the absorption liquid flow rate: 6.94×10 -6 m 3 ·s -1 ; Liquid phase pressure 0.2MPa (absolute pressure); gas phase pressure 0.16MPa (absolute pressure); CO 2 Mass transfer flux N CO2 , total mass transfer coefficient K G The relationship with the type of absorption liquid is shown in Table 2 below:

[0031] Table 2 CO in different absorption liquids 2 Mass transfer flux N CO2 , total mass transfer coefficient K G

[0032]

[0033] Water is used as the absorption liquid, the absorption is physical absorption, CO 2 Throughput NCO2 Overall mass transfer coefficient K G Both are low, but using alkaline aqueous solution as the absorption liquid, the absorption process is accompanied by chemical reactions, and the solute and CO in diff...

Embodiment 2

[0035] Using different concentrations of NaOH aqueous solution as the absorption liquid to absorb and remove CO 2 , absorption liquid flow rate: 6.94×10 -6 m 3 ·s -1 ; Liquid phase pressure 0.2MPa (absolute pressure); gas phase pressure 0.16MPa (absolute pressure); CO 2 Mass transfer flux N CO2 , total mass transfer coefficient K G The relationship with the concentration of NaOH solution is shown in Table 3.

[0036] Table 3 CO at different NaOH solution concentrations 2 Mass transfer flux N CO2 , total mass transfer coefficient K G

[0037]

[0038] When the concentration of NaOH in the absorption solution increases, due to the CO 2 Increased reaction rate with NaOH solution and OH in the boundary layer - The increase in the concentration of CO 2 Throughput N CO2 , total mass transfer coefficient K G The maximum absorption rate is obtained at 2M; when the concentration of NaOH continues to increase, the viscosity of the solution increases due to the increase o...

Embodiment 3

[0040] Water (absorbing liquid 1) and 2MNaOH (absorbing liquid 2) are used as the absorbing liquid, the liquid phase pressure is 0.2MPa (absolute pressure), and the gas phase pressure is 0.16MPa (absolute pressure); CO 2 Mass transfer flux N CO2 , total mass transfer coefficient K G The relationship with the absorption liquid flow rate is shown in Table 4.

[0041] Table 4 CO at different absorption liquid flow rates 2 Mass transfer flux N CO2 , total mass transfer coefficient K G

[0042]

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PUM

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Abstract

An application of the membrane module with compact polymer membrane in gas-liquid separation is disclosed. Its working process includes such steps as diffusing the gas via micropores of membrane to the compact active layer, dissolving-diffusing to make it reach the interface of polymer membrane and absorbing liquid, reacting on absorbing liquid to generate transfer mass, and carrying gas away by the absorbing liquid.

Description

technical field [0001] The invention belongs to a mixed gas separation technology combining membrane separation and gas absorption, in particular to the application of a membrane module using a dense polymer membrane as a gas-liquid contactor in the mixed gas separation. Background technique [0002] Dense membrane-based gas absorption technology is a new type of hybrid membrane technology that combines membrane technology and gas absorption technology. The principle of dense membrane-based gas absorption method is to use a non-porous membrane to separate the gas phase from the liquid phase. The gas and absorption liquid are in contact with the membrane. Absorption and mass transfer are carried out on the interface to realize the separation and removal of acid gases such as carbon dioxide and hydrogen sulfide. [0003] In recent years, the absorption and removal of acidic gases have attracted more and more attention. Taking carbon dioxide as an example: First, due to the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D53/14
Inventor 曹义鸣袁权孙承贵左莉林斌介兴明刘健辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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