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Composite membrane taking carboxylate ion as fixed carrier and preparation method thereof

A fixed carrier and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of affecting membrane separation performance, affecting membrane life, and easy oxidation of amine groups, so as to achieve the goal of not being easily oxidized , good separation performance, good stability effect

Active Publication Date: 2011-05-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the separation system where the oxidant exists, the amine group is easily oxidized, which affects the separation performance of the membrane, and even affects the membrane life.
Carboxylate has stable performance and is not easy to be oxidized, so it can be used as a carrier for separating acid gases. At present, there is no research on a composite membrane for separating acid gases using carboxylate as a carrier alone.

Method used

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  • Composite membrane taking carboxylate ion as fixed carrier and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] Weigh 50g of sodium acrylate solution with a mass fraction of 10% and place it in a 250ml three-necked flask, add 50g of water, and pass N 2 After purging for 0.5h, react in a water bath at 45°C for 7.5h. Slowly pour the polymer solution into a beaker filled with ethanol, stir well to make it precipitate, take out the precipitate, and dry it in a vacuum oven at 40°C to obtain sodium polyacrylate. Dissolve sodium polyacrylate in a plastic flask to prepare an aqueous solution with a mass concentration of 0.375%, pour it into a plastic reagent bottle and let it stand for 24 hours to be used as a casting solution. A polysulfone flat membrane (nominal molecular weight cut-off of 30,000) with a size of 22cm×13cm is immersed in an aqueous sodium carbonate solution with a mass concentration of 1%, soaked at room temperature for 24h, rinsed and immersed in an aqueous ethanol solution with a volume concentration of 20%, Soak at room temperature for 24 hours, dry for later use. ...

Embodiment 2

[0019]Weigh 3.2g of acrylamide, 10g of 10% sodium acrylate solution, and 68.8g of deionized water, mix them and place them in a 250ml three-necked flask. Install the stirrer and react in a 45°C water bath for 7.5 hours. Slowly pour the polymer solution into a beaker filled with ethanol, stir well to make it precipitate, take out the precipitate and place it in a vacuum oven at 40°C to dry to obtain the copolymer P(SA-co-AM) of sodium acrylate-acrylamide. Put the copolymer into a plastic flask to dissolve, prepare an aqueous solution with a mass concentration of 0.375%, pour it into a plastic reagent bottle and let it stand for 24 hours to be used as a casting solution. Treat the polysulfone flat membrane according to the size of the base membrane and the pretreatment method in Example 1, get 4g of the above-mentioned casting solution and coat it on the treated polysulfone flat membrane, and dry it at a temperature of 30°C and a relative humidity of 40% to obtain separation Fa...

Embodiment 3

[0021] Weigh 2.8g of acrylamide, 24g of 10% sodium acrylate solution, and 77.2g of deionized water, mix them and place them in a 250ml three-necked flask. Install the stirrer and react in a 45°C water bath for 7.5 hours. Slowly pour the polymer solution into a beaker filled with ethanol, stir well to make it precipitate, take out the precipitate and place it in a vacuum oven at 40°C to dry to obtain the copolymer P(SA-co-AM) of sodium acrylate-acrylamide. The copolymer was dissolved in a plastic flask, prepared into an aqueous solution with a mass concentration of 1%, poured into a plastic reagent bottle and left to stand for 24 hours to be used as a casting solution. Treat the polysulfone flat membrane according to the size of the base membrane and the pretreatment method in Example 1, get 4g of the above-mentioned casting solution and coat it on the treated polysulfone flat membrane, and dry it at a temperature of 30°C and a relative humidity of 40% to obtain separation Fac...

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Abstract

The invention relates to a composite membrane taking carboxylic group as a fixed carrier and a preparation method thereof. Polysulfone or polyethersulfone ultrafiltration membrane is taken as a basic membrane; after pre-treated, membrane casting solution prepared by polymerization of the raw materials of sodium acrylate and allylamine is coated on the basic memberane, and is dried to obtain the composite membrane facilitating transport and taking the carboxylic group as the carrier. The invention has advantages of simple method, low cost and good membrane forming ability, and has the following main parameters: the infiltration rate of CO2 is 180*10<-6>cm<3>(STP) / cm<2>.s.cmHg; the highest separation factors of CO2 / CH4 (volume ratio of 10:90) and CO2 / N2( volume ration of 20:80) are respectively 90 and 150; the infiltration rate of H2S is as high as 1190*10<-6>cm<3> (STP) / cm<2>.s.cmHg, and the separation factor of H2S / CH4 (volume ratio of 5:95) is as high as 805.

Description

technical field [0001] The invention relates to the preparation of a facilitative transfer membrane for separating acid gas, in particular to a composite membrane with carboxylate as a fixed carrier and a preparation method thereof. Background technique [0002] The fixed carrier composite membrane used to separate gases is a new type of gas separation membrane, which has high permeability and high selectivity, and the carrier is not easy to lose. Compared with carrier membranes such as liquid membranes and ion exchange membranes, fixed carrier membranes have much high stability. [0003] At home and abroad, there have been many studies on the separation of CO 2 The study of immobilized support membranes of other gases. Yoshikawa et al. prepared methacrylic acid-N,N-dimethylaminoethyl ester / acrylonitrile (DMAEMA / AN) copolymer and methacrylic acid-N,N-dimethylamino Ethyl ester / isooctyl methacrylate (DMAEMA / 2EHMA) copolymerized polymer film, CO 2 / N 2 The theoretical sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/68
Inventor 王志王明明于型伟王纪孝王世昌
Owner TIANJIN UNIV
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