Method for preparing facilitated transport membrane containing polyallylamine for separating acid gas

A technology that promotes transfer membranes, polyallylamine, and is used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc.

Inactive Publication Date: 2008-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are not many studies at home and abroad on the use of amine groups as facilitative transfer carriers in composite membranes, and

Method used

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  • Method for preparing facilitated transport membrane containing polyallylamine for separating acid gas
  • Method for preparing facilitated transport membrane containing polyallylamine for separating acid gas
  • Method for preparing facilitated transport membrane containing polyallylamine for separating acid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0016] Weigh 172.5 grams (1.5mol) of phosphoric acid with a mass fraction of 85% and place it in a 250ml three-necked flask, add 42.75 grams of monomer allylamine (0.75mol) dropwise, and react in an oil bath at 50°C for 72 hours to synthesize poly Allylamine Phosphate. Precipitate in ethanol, and the precipitated product is crushed and dissolved in saturated potassium hydroxide methanol solution. After fully dissolved, the precipitate is filtered off, and the solution is vacuum-dried at 60°C to obtain polyallylamine. Prepare a polyallylamine aqueous solution with a mass concentration of 5%, and simultaneously prepare a polyvinyl alcohol aqueous solution with a mass concentration of 1%, wherein the molecular weight of polyvinyl alcohol is 75000, according to the volume of polyallylamine and polyvinyl alcohol aqueous solution Ratio 5:95 to prepare 4ml casting liquid, the size is 22cm * 13cm polyethersulfone flat membrane (nominal molecular weight cut-off is 30000) soak in the so...

Embodiment 2

[0018] The polyallylamine aqueous solution with a mass concentration of 5% and the polyvinyl alcohol aqueous solution with a mass concentration of 1% prepared in Example 1 were used. According to the volume ratio of polyallylamine and polyvinyl alcohol aqueous solution as 12:88, prepare 4mL casting solution, treat the polyethersulfone flat membrane according to the size of the base membrane and the pretreatment method in Example 1, and apply the prepared 4mL casting solution On the treated polyethersulfone flat membrane, dry at a temperature of 30°C and a relative humidity of 40%, to obtain a polyallylamine-containing facilitated transport membrane for separating acid gases. With mixed gas 10vol% CO 2 / 90vol%CH 4 and 20vol% CO 2 / 80vol%N 2 Performance test it. Test result: for 10vol% CO 2 / 90vol%CH 4 Mixed gas system, when the feed gas pressure is 83.5~1291.3cmHg (0.1~1.7MPa), CO 2 / CH 4 Separation factor 120~50, CO 2 Penetration rate (90~20)×10 -6 cm 3 (STP)cm -2 ...

Embodiment 3

[0020] Using the 5% polyallylamine aqueous solution with a mass concentration prepared in Example 1, simultaneously prepare a 1% polyvinylpyrrolidone aqueous solution, wherein the polyvinylpyrrolidone has a molecular weight of 100,000, according to polyallylamine The volume ratio of polyvinylpyrrolidone aqueous solution is 5:95 to prepare 3ml casting liquid, according to the size of the base membrane and the pretreatment method in Example 1, the polysulfone flat membrane is processed, and the prepared 3mL casting liquid is coated on the treated polysulfone On the flat membrane, dry at a temperature of 30° C. and a relative humidity of 40%, to obtain a polyallylamine-containing facilitated transport membrane for separating acid gases. With mixed gas 10vol% CO 2 / 90vol%CH 4 and 20vol% CO 2 / 80vol%N 2 Performance test it. Test result: for 10vol% CO 2 / 90vol%CH 4 Mixed gas system, when the feed gas pressure is 83.5~1051.2cmHg (0.1~1.4MPa), CO 2 / CH 4 Separation factor 80-4...

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Abstract

The present invention provides a preparing method of accelerating transmitting film containing poly allyl amine for separating acidic gas. The invention includes following steps: pretreatment using polysulphone or polyether sulfone plate film as base film; preparing casting film solution by mixing poly allyl amine solution with polyvinyl alcohol solution, plasmosan solution and polyacrylamide solution respectively, casting film solution coating on the base film; accelerating transmitting film containing poly allyl amine for separating acidic gas being obtained by dyring. The method has a simple process, the accelerating transmitting film has a better filming performance and pressure resistance, the mainly parameter is CO2/CH4, CO2/N2 separating factor 40-150, CO2 permeation rate (10-150) *10-6cm3(STP)cm-2s-1cmHg-1; H2S/CH4 separating factor 60-500, H2S permeation rate (50-900) *10-6cm3(STP)cm-2s-1cmHg-1.

Description

technical field [0001] The invention discloses a preparation method of a polyallylamine facilitated transfer membrane for separating acid gas, which belongs to the preparation technology of a facilitated transfer membrane for separating acid gas. Background technique [0002] The fixed support composite membrane is a new type of gas separation membrane with high permeability and high selectivity. There are not many studies at home and abroad on the use of amine groups as facilitative transfer carriers in composite membranes, and there has not been any report on the use of amine groups in polyallylamine alone as facilitative transfer carriers in composite membranes. [0003] Jian Zou et al [Jian Zou, W.S. Winston Ho CO 2 -selective polymeric menbrane containingamines in crosslinked poly(vinyl alcohol), Journal Of Membrane Science, 2006, 286: 310-321] Polyallylamine was prepared by reacting polyallylamine hydrochlorate with potassium hydroxide, Then it is mixed with polyviny...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D71/60B01D69/12
Inventor 王志蔡彦柏云华秦海峰王纪孝
Owner TIANJIN UNIV
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