CN2369748Y

CN2369748Y - Film type mixed gas component remover

Info

Publication number: CN2369748Y
Application number: CN 99209362
Authority: CN
Inventors: 徐又一; 徐红; 陈元胜; 王树源; 王红军
Original assignee: MEMBRANE SEPARATION ENGRG UNITED CO ZHEJIANG UNIV
Current assignee: Zhejiang University of Hangzhou Kai Hua Membrane Technology Co., Ltd.
Priority date: 1999-04-26
Filing date: 1999-04-26
Publication date: 2000-03-22
Anticipated expiration: 2009-04-26

Abstract

The utility model relates to a membrane type mixed gas component remover. A hydrophobic polypropylene or a polyethylene hollow fiber microporous membrane is arranged inside a casing and a mixed gas nozzle and an absorption liquid nozzle are arranged on the casing, wherein, the hollow fiber microporous membrane can be provided with a sheet-shaped component or a cylindrical structure and a pump and an absorption liquid storage pool are arranged on a liquid absorbing pipeline for complementing the absorption liquid. The device has the advantage of high selective separation rate on mixed gas components, particularly the acid component or the alkaline component in the mixed gas with 90-98% of removing rate, and can obtain useful high purity products at one side of the absorption liquid.

Description

Membrane type mixed gas component remover

The utility model belongs to a device for separating components from mixed gas.

At present, the product for separating the components of the mixed gas by a membrane method is widely applied. The membrane material adopted by the product is generally a compact membrane, such as polyimide, polyether sulfone and the like. The separation of the components of the mixed gas is realized by utilizing the dissolution and diffusion mechanism of the membrane material to the gas according to different selectivities of the membrane material to the gas.

This existing product has the following disadvantages: 1. the large pressure difference is needed on the two sides of the membrane, so that the equipment is complicated, and the production cost is increased; 2. the gas selective separation factor of the dense membrane material is often in inverse proportion to the gas permeation rate, namely, if the gas permeation rate is high, the separation factor is low, so that the gas separation efficiency is limited; 3. the compact membrane material has different selective permeability to gas, and if the gas is changed, different compact membranes are required to be selected, which brings inconvenience to production and use.

The utility model provides a diaphragm type mixed gas component that uses under the ordinary pressure condition takes off ware to the problem that prior art exists, simple structure, convenient to use, low in production cost is honest and clean, and the separation efficiency is high.

In order to realize the purpose, the technical scheme is as follows:

the shell of the membrane type mixed gas component remover is internally provided with a sheet component or a hydrophobic polypropylene or polyethylene hollow fiber microporous membrane with a cylindrical structure, and the shell is provided with a mixed gas inlet pipe nozzle and an outlet pipe nozzle for the residual components after the components are separated; and inlet and outlet nozzles for absorbing liquid.

The hollow fiber microporous membrane component is composed of superfine fibers, each fiber is hollow, micropores are distributed on the wall of each fiber, and each component of mixed gas is filled on the inner side and the outer side of the hollow fiber membrane and can penetrate through the micropores on the membrane wall from the inner side of the fiber to enter the outer side; however, due to the hydrophobic property of the hollow fiber microporous membrane, the absorption liquid cannot penetrate through the micropores from the outer side of the fiber to the inner side, and the absorption liquid only fills the gaps on the outer side of the hollow fiber. The gas components which do not need to be separated and removed do not react with the absorption liquid, so that the gas components enter and exit from the two sides of the micropores to be balanced; the component to be separated and removed from the mixed gas immediately reacts with the corresponding absorption liquid irreversibly after penetrating through the micropores of the membrane wall, so that the component forms a large pressure difference between the inside and the outside of the membrane fiber, and the component gas is pushed to continuously enter the other side of the membrane fiber from one side of the mixed gas to react with the absorption liquid irreversibly, thereby achieving the purpose of separating the component from the mixed gas. The utility model discloses a substantive characteristics and progress:

1. the microporosity and the air permeability of the polypropylene or polyethylene hollow fiber microporous membrane are utilized to ensure that gas can pass through the membrane wall at a large permeation rate;

2. the technology takes the membrane as a boundary, the gas phase and the liquid phase respectively flow, the two-phase flow and the pressure can be respectively controlled, the environmental pressure adopts normal pressure, a complex pressurizing device is not needed, the structure is simple, the cost is low, and the popularization and the use are convenient;

3. the gas component to be separated and the absorption liquid are subjected to irreversible chemical reaction to cause the gas pressure difference at two sides of the micropores to be driving force, so that the component can be separated in high selectivity, the removal rate of acidic components or alkaline gas components in the mixed gas can reach 90-98%, a useful product can be obtained at one side of the absorption liquid, the purity of the product is high, and the product can be used for preparing reagent-grade products.

Embodiments of the technical solution are explained in detail with reference to the accompanying drawings:

the attached drawing is the structure schematic diagram of an embodiment of the present invention. The shell 2 is made of plastic ABS tube, the shell is equipped with cylindrical hydrophobic hollow fiber microporous membrane which is composed of superfine fiber 3 with micropores on the hollow wall, the two ends of the membrane are bonded by epoxy resin 4, the hydrophobic hollow fiber microporous membrane material is polypropylene or polyethylene; the shell 2 is provided with mixed gas (such as ammonia copper washingregeneration gas, CO and NH)₃、H₂、N₂And the like) inlet nozzle 5 and outlet nozzle 1 after the components are separated and removed, the shell is also provided with an inlet nozzle 8 and an outlet nozzle 6 for absorbing liquid (such as sulfuric acid), and a pump 7 and an absorbing liquid storage tank 10 are arranged on the pipeline to supplement and supply the absorbing liquid. As shown in the partially enlarged view P of the drawing, all the gaps except the hollow fibers 3 are filledFull absorption liquid (sulfuric acid) 9, wherein the absorption liquid cannot penetrate through micropores on the fiber wall to enter the fiber mesopores; and mixed gas components of CO and NH₃、N₂、H₂From the pores of the fiber, the liquid can enter the absorption liquid through micropores, but only the component NH required to be separated and removed₃Can generate irreversible chemical reaction with absorption liquid sulfuric acid: and the thiamine solution can be continuously generated, refined ammonium sulfate can be obtained through post-treatment, and the rest is free of NH₃Others such as CO, H₂、N₂The components are discharged through an outlet pipe nozzle 1, thereby realizing the separation and removal of NH₃The purpose of the components is.

Another embodiment is to introduce mixed gas biogas or natural gas into the polypropylene hollow fiber microporous membrane, wherein the main component is CH₄、H₂S and CO₂Requires the separation of CO₂And H₂And (5) an S component. Using the absorption liquid NaOH, since H₂S and CO₂Can react with NaOH irreversibly, only has CH₄Cannot react chemically, so that CO can be separated and removed₂And H₂S component to realize obtaining pure CH₄The purpose of (1).

Claims

1. A membrane-type remover for the components of mixed gas features that a hydrophobic microporous membrane of polypropylene or polyethylene hollow fibres is arranged in the casing, the mixed gas inlet and outlet nozzles and the absorbing liquid inlet and outlet nozzles are arranged on the casing, the mixed gas is filled in the both sides of hollow fibres, the absorbing liquid is filled in the gap between hollow fibres, and the absorbing liquid can generate irreversible chemical reaction with the components to be separated in the mixed gas.

2. A membrane type mixed gas component remover according to claim 1, characterized in that a cylindrical hollow fiber microporous membrane (3) is installed in the housing (2); the shell is provided with an inlet nozzle (5) for mixed gas and an outlet nozzle (1) for the mixed gas containing other components after the components are separated and removed; the shell is also provided with an inlet pipe nozzle (8) and an outlet pipe nozzle (6) for absorbing liquid, and the pipeline is provided with a pump (7) and an absorbing liquid storage pool (10).