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Preparation method of amino-containing copolymer film separating acidic gas

A copolymer membrane and acid gas technology, which is applied in the field of preparation of amino-containing polymer membranes, can solve the problems of permeation and separation performance degradation, and achieve good acid gas permeation and separation performance, simple method, and excellent CO2 permeation rate.

Inactive Publication Date: 2015-01-07
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the carrier (amino group) content is higher than the optimum value, due to the influence of factors such as crystallization and the formation of hydrogen bonds between amino groups, the permeation and separation performance of the membrane will decrease with the further increase of the carrier (amino group) content.

Method used

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  • Preparation method of amino-containing copolymer film separating acidic gas
  • Preparation method of amino-containing copolymer film separating acidic gas
  • Preparation method of amino-containing copolymer film separating acidic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 0.05 g of azobisisobutyromidine hydrochloride and 1 g of N-vinylformamide successively into a three-necked flask equipped with a stirrer and a condenser. After the azobisisobutyronitrile is dissolved, add 9 g of 10 g of methanol solution of vinyl acetate was purged with nitrogen for 30 minutes, then polymerized in a water bath at 70° C. for 4 hours to obtain a copolymer of N-vinylformamide and vinyl acetate. Then add methanol solution containing 0.3mol / L NaOH to the polymer, and alcoholyze at 70°C for 20 minutes; Hydrolyze for 90 minutes at ℃ to obtain vinylamine-vinyl alcohol copolymer hydrochloride; after ethanol precipitation, anion exchange and other impurity removal and purification processes, it is prepared into a polymer solution with a concentration of 1.8%, and coated on polysulfone ultrafiltration membrane (molecular weight cut-off 6000) surface layer, the obtained film was dried at 30° C. for 10 hours. Using CO 2 / N 2 Mixed gas (20vol%CO 2 ,80vol%N 2...

Embodiment 2

[0023] Add 0.075 g of azobisisobutyramide hydrochloride and 7.5 g of N-vinylformamide in sequence in a three-necked flask equipped with a stirrer and a condenser, and after the azobisisobutyramide hydrochloride is dissolved, add the 7.5 g of vinyl acetate in 6 g of methanol solution was purged with nitrogen for 30 minutes, then polymerized in a water bath at 60° C. for 3 hours to obtain a copolymer of N-vinylformamide and vinyl acetate. Then add a methanol solution containing 0.1mol / L NaOH to the copolymer, and alcoholyze it at 45°C for 30 minutes; dissolve the obtained solid in water, prepare a 5% aqueous solution by adding 1mol / L HCl, and hydrolyze it at 50°C After 90 minutes, vinylamine-vinyl alcohol copolymer hydrochloride was obtained; after ethanol precipitation, anion exchange and other impurity removal and purification processes, water was added to prepare a polymer solution with a mass concentration of 2%. The solution is coated on the surface layer of a polysulfone u...

Embodiment 3

[0025]Add 0.05 g of azobisisobutylamidine hydrochloride and 7 g of N-vinylformamide in sequence in a three-necked flask equipped with a stirrer and a condenser. After the azobisisobutylamidine hydrochloride is dissolved, add the A solution of 3 g of vinyl acetate in 4 g of methanol was purged with nitrogen for 30 minutes, then polymerized in a water bath at 50° C. for 5 hours to obtain a copolymer of N-vinylformamide and vinyl acetate. Then add a methanol solution containing 0.2mol / L NaOH to the copolymer, and alcoholyze at 45°C for 30 minutes; dissolve the obtained solid in water, prepare a 10% aqueous solution, add 2mol / L HCl, and hydrolyze at 60°C After 80 minutes, vinylamine-vinyl alcohol copolymer hydrochloride was obtained; after ethanol precipitation, anion exchange and other impurity removal and purification processes, it was prepared into a polymer solution with a concentration of 1%. The solution was coated on the surface layer of a polysulfone ultrafiltration membra...

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Abstract

The invention discloses a preparation method of an amino-containing copolymer film separating acidic gas. A flat plate film or a hollow fiber film after pretreatment is taken as a base film, an amino-containing vinyl amine-vinyl alcohol copolymer thin film is coated on the surface of the base film, drying is performed and then the amino-containing copolymer film is obtained, wherein a vinyl amine-vinyl alcohol copolymer film-coating solution takes N-vinyl formamide monomers and vinyl acetate monomers as raw materials, methanol is added as a solvent, azobis(isobutylamidine hydrochloride) or azobisisobutyronitrile is taken as an initiator, and polymerization reaction is performed at the temperature of 45-70 DEG C to prepare a copolymer; and a methanol solution containing a strong base is added into the copolymer, alcoholysis is performed at the temperature of 45-70 DEG C, an obtained solid is dissolved in water, then an HCl solution is added, hydrolysis is performed at the temperature of 50-70 DEG C to get vinyl amine-vinyl alcohol copolymer hydrochloride, impurity removal and purification process steps including deacidification are further performed, and water is finally added to prepare a polymer solution with the mass concentration of 0.5-5%.

Description

technical field [0001] The invention relates to the preparation technology of a fixed carrier composite membrane for separating acid gas, in particular to a preparation method of an amino group-containing polymer membrane for separating acid gas. Background technique [0002] CO 2 、H 2 The gas membrane separation technology of acid gas such as S is used in natural gas, biogas purification, flue gas CO 2 Recycling and air purification in confined spaces. At present, high-performance membrane materials and composite membrane preparation technology are still hot spots in the research of acid gas separation membrane technology. [0003] Immobilized carrier membrane materials containing functional groups such as amino groups, pyrimidine groups, and carboxylate groups are a very important class of acid gas separation membrane materials. Through groups such as amino groups and CO 2 reversible reaction, greatly promoting the CO 2 transport within the membrane, thus having a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/44B01D71/38B01D71/68B01D69/12B01D67/00B01D53/22
Inventor 伊春海杨伯伦胡佳阳刘景武裴红珍
Owner XI AN JIAOTONG UNIV
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